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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2016	Apr. 29, 2016
Document Information [Line Items]
Entity Registrant Name	WEYERHAEUSER CO
Trading Symbol	WY
Entity Central Index Key	0000106535
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		747,073,616

CONSOLIDATED STATEMENT OF OPERATIONS - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Net sales	$ 1,835	$ 1,727
Cost of products sold	1,475	1,385
Gross margin	360	342
Selling expenses	27	28
General and administrative expenses	85	74
Research and development expenses	6	5
Charges for integration and restructuring, closures and asset impairments (Note 15)	117	14
Other operating costs (income), net (Note 16)	(61)	21
Operating income	186	200
Equity earnings (loss) from joint ventures (Note 6)	3	(6)
Interest income and other	9	9
Interest expense, net of capitalized interest	(97)	(83)
Earnings before income taxes	101	120
Income taxes (Note 17)	(20)	(19)
Net earnings	81	101
Dividends on preference shares	(11)	(11)
Net earnings attributable to Weyerhaeuser common shareholders	$ 70	$ 90
Earnings per share attributable to Weyerhaeuser common shareholders, basic and diluted (Note 4):
Earnings per share attributable to Weyerhaeuser common shareholders, basic and diluted (Note 4)	$ 0.11	$ 0.17
Dividends paid per share	$ 0.31	$ 0.29
Weighted average shares outstanding (in thousands) (Note 4):
Basic	632,004	523,426
Diluted	634,872	527,423

CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Net earnings	$ 81	$ 101
Other comprehensive income (loss):
Foreign currency translation adjustments	41	(47)
Actuarial gains, net of tax expense of $8 and $26	10	62
Prior service costs, net of tax expense of $1 and $0	(2)	(2)
Unrealized gains on available-for-sale securities	0	1
Total other comprehensive income	49	14
Comprehensive income	$ 130	$ 115

CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Tax expense (benefit) of actuarial gains (losses)	$ 8	$ 26
Tax expense (benefit) of prior service credits (costs)	$ 1	$ 0

CONSOLIDATED BALANCE SHEET - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
ASSETS
Cash and cash equivalents	$ 415	$ 1,012
Receivables, less allowances of $4 and $3	578	487
Receivables for taxes	25	30
Inventories (Note 5)	677	568
Prepaid expenses and other current assets	135	77
Total current assets	1,830	2,174
Property and equipment, less accumulated depreciation of $6,371 and $6,294	2,763	2,572
Construction in progress	223	195
Timber and timberlands at cost, less depletion charged to disposals	14,548	6,480
Minerals and mineral rights, net	325	14
Investments in and advances to joint ventures	1,011	74
Goodwill	40	40
Deferred tax assets	15	4
Other assets	409	302
Restricted financial investments held by variable interest entities	615	615
Total assets		12,470
Liabilities
Notes payable	4	4
Accounts payable	385	326
Accrued liabilities (Note 9)	595	545
Total current liabilities	984	875
Note payable to Timberland Venture (Note 10)	835	0
Long-term debt (Note 10)	7,803	4,875
Long-term debt (nonrecourse to the company) held by variable interest entities	511	511
Deferred income taxes	71	86
Deferred pension and other postretirement benefits	983	987
Other liabilities	311	267
Total liabilities	11,498	7,601
Commitments and contingencies (Note 12)
Equity:
Mandatory convertible preference shares, series A: $1.00 par value; $50.00 liquidation; authorized 40,000,000 shares; issued and outstanding: 13,799,711 and 13,799,711 shares	14	14
Common shares: $1.25 par value; authorized 1,360,000,000 shares; issued and outstanding: 759,044,221 and 510,483,285 shares	948	638
Other capital	9,305	4,080
Retained earnings	1,177	1,349
Cumulative other comprehensive loss (Note 13)	(1,163)	(1,212)
Total equity	10,281	4,869
Total liabilities and equity	$ 21,779	$ 12,470

CONSOLIDATED BALANCE SHEET (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Receivables, allowances	$ 4	$ 3
Property and equipment, accumulated depreciation	$ 6,371	$ 6,294
Common shares, par value	$ 1.25	$ 1.25
Common shares, authorized	1,360,000,000	1,360,000,000
Common shares, issued	759,044,221	510,483,285
Common shares, outstanding	759,044,221	510,483,285
6.375 percent Mandatory Convertible Preference Shares, Series A
Preference shares, par value	$ 1.00	$ 1.00
Preference shares, liquidation	$ 50.00	$ 50.00
Preference shares, authorized	40,000,000	40,000,000
Preference shares, issued	13,799,711	13,799,711
Preference shares, outstanding	13,799,711	13,799,711

CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operations:
Net earnings	$ 81	$ 101
Noncash charges (credits) to earnings:
Depreciation, depletion and amortization	142	123
Basis of real estate sold	17	10
Deferred income taxes, net	18	13
Pension and other postretirement benefits (Note 7)	4	10
Share-based compensation expense	24	8
Charges for impairment of assets	0	13
Equity (earnings) loss from joint ventures (Note 6)	(3)	6
Net gains on dispositions of assets and operations	(41)	(16)
Foreign exchange transaction losses (Note 16)	(13)	29
Change in:
Receivables less allowances	(47)	(16)
Receivable for taxes	10	2
Inventories	(43)	(57)
Prepaid expenses	(1)	(11)
Accounts payable and accrued liabilities	(70)	(91)
Pension and postretirement contributions (Note 7)	(17)	(20)
Distributions from joint ventures	5	0
Other	(19)	(17)
Net cash from operations	47	87
Cash flows from investing activities:
Capital expenditures for property and equipment	(57)	(71)
Capital expenditures for timberlands reforestation	(16)	(18)
Acquisition of timberlands	(6)	(32)
Proceeds from sale of assets	70	2
Distributions from joint ventures	24	0
Cash and cash equivalents acquired in Plum Creek merger (Note 3)	9	0
Cash from (used in) investing activities	24	(119)
Cash flows from financing activities:
Net proceeds from issuance of debt (Note 10)	1,098	0
Payments on debt (Note 10)	(720)	0
Cash dividends on common shares	(241)	(152)
Repurchase of common stock (Note 4)	(798)	(253)
Other	(7)	15
Cash from financing activities	(668)	(390)
Net change in cash and cash equivalents	(597)	(422)
Cash and cash equivalents at beginning of period	1,012	1,580
Cash and cash equivalents at end of period		1,158
Cash paid (received) during the period for:
Interest, net of amount capitalized of $2 and $1	125	114
Income taxes	(13)	1
Noncash investing and financing activity:
Equity issued as consideration for our merger with Plum Creek (Note 3)	$ 6,383	$ 0

CONSOLIDATED STATEMENT OF CASH FLOWS (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Interest, amount capitalized	$ 2	$ 1

BASIS OF PRESENTATION

3 Months Ended

Mar. 31, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

BASIS OF PRESENTATION

We are a corporation that has elected to be taxed as a real estate investment trust (REIT). We expect to derive most of our REIT income from investments in timberlands, including the sale of standing timber. As a REIT, we generally are not subject to federal corporate level income taxes on REIT taxable income that is distributed to shareholders. We are required to pay corporate income taxes on earnings of our Taxable REIT Subsidiary (TRS), which includes our manufacturing businesses and the portion of our Timberlands and Real Estate and Energy & Natural Resources (Real Estate & ENR) segments' income included in the TRS.

Our consolidated financial statements provide an overall view of our results and financial condition. They include our accounts and the accounts of entities we control, including:


•	majority-owned domestic and foreign subsidiaries,


•	the results of Plum Creek Timber Company, Inc. (Plum Creek) for the period from February 19, 2016 (the merger date) to March 31, 2016 (see Note 3: Merger with Plum Creek), and


•	variable interest entities in which we are the primary beneficiary.

They do not include our intercompany transactions and accounts, which are eliminated.

We account for investments in and advances to unconsolidated equity affiliates using the equity method, with taxes provided on undistributed earnings. This means that we record earnings and accrue taxes in the period earnings are recognized by our unconsolidated equity affiliates.

Throughout these Notes to Consolidated Financial Statements, unless specified otherwise, references to “Weyerhaeuser,” “we,” "the company" and “our” refer to the consolidated company.

The accompanying unaudited Consolidated Financial Statements reflect all adjustments that are, in the opinion of management, necessary for a fair presentation of our financial position, results of operations and cash flows for the interim periods presented. Except as otherwise disclosed in these Notes to Consolidated Financial Statements, such adjustments are of a normal, recurring nature. The Consolidated Financial Statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission pertaining to interim financial statements; certain disclosures normally provided in accordance with accounting principles generally accepted in the United States have been omitted. These Consolidated Financial Statements should be read in conjunction with the Consolidated Financial Statements and Management’s Discussion and Analysis of Financial Condition and Results of Operations included in our Annual Report on Form 10-K for the year ended December 31, 2015. Results of operations for interim periods should not be regarded as necessarily indicative of the results that may be expected for the full year.

RECLASSIFICATIONS

We have reclassified certain balances and results from the prior year to be consistent with our 2016 reporting. This makes year-to-year comparisons easier. Our reclassifications had no effect on consolidated net earnings or equity.

As a result of the merger, we have revised our business segments. Results for fiscal periods prior to first quarter 2016 have been revised to conform to the new segments. Note 2: Business Segments provides information about our revised business segments.

NEW ACCOUNTING PRONOUNCEMENTS

In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2014-09, a comprehensive new revenue recognition model that requires an entity to recognize revenue to depict the transfer of goods or services to customers at an amount that reflects the consideration it expects to receive in exchange for those goods or services. In August 2015, the FASB issued ASU 2015-14, which deferred the effective date for an additional year. In March 2016, FASB issued ASU 2016-08, which does not change the core principle of the guidance; however, it does clarify the implementation guidance on principal versus agent considerations. We plan to adopt these accounting standard updates on January 1, 2018 and may use either the retrospective or cumulative effect transition method. We are evaluating the impact on our consolidated financial statements and related disclosures. We have not yet selected a transition method nor determined the effect of the standard to our ongoing financial reporting.

In April 2015, FASB issued ASU 2015-03, which amends the presentation of debt issuance costs on the consolidated balance sheet. Under the new guidance, debt issuance costs are presented as a direct deduction from the carrying amount of the debt liability rather than as an asset. The new guidance is effective retrospectively for fiscal periods beginning after December 15, 2015. We adopted on January 1, 2016 and have reclassified balances of debt issuance costs accordingly in our consolidated balance sheet and in related disclosures for all periods presented.

In May 2015, FASB issued ASU 2015-07, which clarifies the presentation within the fair value hierarchy of certain investments held within our pension plan. The new guidance is effective retrospectively for fiscal periods starting after December 15, 2015. This new guidance removes the requirement to categorize within the fair value hierarchy investments for which fair value is measured using the net asset value per share as a practical expedient and, instead, permits separate disclosure. Upon adoption these investments are presented separately from the fair value hierarchy and reconciled to total investments in our consolidated financial statements and related disclosures. We adopted on January 1, 2016.

In July 2015, FASB issued ASU 2015-11, which simplifies the measurement of inventories valued under most methods, including our inventories valued under FIFO – the first-in, first-out – and moving average cost methods. Inventories valued under LIFO – the last-in, first-out method – are excluded. Under this new guidance, inventories valued under these methods would be valued at the lower of cost or net realizable value, with net realizable value defined as the estimated selling price less reasonable costs to sell the inventory. The new guidance is effective prospectively for fiscal periods starting after December 15, 2016 and early adoption is permitted. We expect to adopt on January 1, 2017 and are evaluating the impact on our consolidated financial statements and related disclosures.

In September 2015, FASB issued ASU 2015-16, which results in the ability to recognize, in current period earnings, any changes in provisional amounts during the measurement period after the closing of an acquisition, instead of restating prior periods for these changes. We adopted on January 1, 2016. We expect it to impact our consolidated financial statements and disclosures related to accounting for our merger with Plum Creek in future interim periods, in the event that measurement period adjustments are recorded.

In February 2016, FASB issued ASU 2016-02, which requires lessees to recognize assets and liabilities for the rights and obligations created by those leases and requires both capital and operating leases to be recognized on the balance sheet. The new guidance is effective for fiscal years beginning after December 15, 2018 and early adoption is permitted. We expect to adopt on January 1, 2019 and are evaluating the impact on our consolidated financial statements and related disclosures.

In March 2016, FASB issued ASU 2016-09, which simplifies several aspects of accounting for share-based payment transactions, including income tax consequences, award classification, cash flows reporting, and forfeiture rate application. Specifically, the update requires all excess tax benefits and tax deficiencies to be recognized as income tax expense or benefit in the income statement with a cumulative-effect adjustment to equity as of the beginning of the period of adoption. The update allows excess tax benefits to be classified along with other income tax cash flows as operating activity on the statement of cash flows. When accruing compensation cost, an entity can make an entity-wide accounting policy election to either estimate the number of awards expected to vest or to account for forfeitures as they occur with a cumulative-effect adjustment to equity as of the beginning of the period of adoption. The update requires cash paid by an employer when directly withholding shares for tax-withholding purposes to be classified as a financing activity on the statement of cash flows, applied retrospectively. This guidance is effective for fiscal years beginning after December 15, 2016. As permitted, we elected to adopt early, and applied the different aspects as prescribed by the standard effective January 1, 2016. The adoption of this guidance represents a change in accounting policy and did not have a material impact on our consolidated financial statements. Shares withheld by the employer for tax-withholding purposes for the first quarter of 2015 of $10 million were retrospectively reclassified from an operating activity to a financing activity in the statement of cash flows.

BUSINESS SEGMENTS

3 Months Ended

Mar. 31, 2016

BUSINESS SEGMENTS

Reportable business segments are determined based on the company’s management approach. The management approach, as defined by FASB ASC 280, “Segment Reporting,” is based on the way the chief operating decision maker organizes the segments within a company for making decisions about resources to be allocated and assessing their performance.

During the first quarter of fiscal year 2016, the company’s chief operating decision maker changed the information regularly reviewed for making decisions to allocate resources and assess performance. As a result, beginning in fiscal year 2016, the company will report its financial performance based on four reportable business segments: Timberlands, Real Estate & ENR, Wood Products, and Cellulose Fibers. Prior to revising our segment structure, activities related to the Real Estate & ENR business segment were reported as part of the Timberlands business segment. All prior period amounts have been reclassified throughout the consolidated financial statements and disclosures to conform to the new segment structure.

We are principally engaged in growing and harvesting timber, manufacturing, distributing, and selling products made from trees, as well as maximizing the value of every acre we own through the sale of higher and better use (HBU) properties and monetizing reserves of minerals, oil, gas, coal, and other natural resources on our timberlands. The following is a brief description of each of our reportable business segments and activities:


•	Timberlands – which includes logs, timber, and our Uruguay operations;


•	Real Estate & ENR – which includes equity interests in our Real Estate Development Ventures (as defined and described in Note 6: Equity Method Investments), sales of HBU and non-core timberlands, minerals, oil, gas, coal and other natural resources;


•	Wood Products – which includes softwood lumber, engineered wood products, oriented strand board, plywood, medium density fiberboard and building materials distribution; and


•	Cellulose Fibers – which includes pulp, liquid packaging board and an equity interest in our newsprint and publishing papers venture.

On November 8, 2015, Weyerhaeuser announced that the board authorized the exploration of strategic alternatives for its Cellulose Fibers business segment. The Board indicated that it intended to consider a broad range of alternatives including, but not limited to, continuing to hold and operate the business or a sale or spin-off of the business. On May 1, 2016, we entered into a transaction agreement to sell our Cellulose Fibers pulp mills to International Paper for $2.2 billion in cash. The deal includes five pulp mills and two modified fiber mills. The transaction with International Paper does not include our liquid packaging board facility or newsprint and publishing papers venture. The Company’s review of those assets is ongoing.

As of March 31, 2016, the assets and liabilities of the Cellulose Fibers business, including those related to the pulp mills, had not met the criteria to be classified as held for sale under the requirements of ASC Topic 360, primarily because the board of directors was still considering a variety of strategic alternatives at that time. Accordingly, the results from these operations are classified as continuing operations in our Consolidated Statement of Operations for the period ended March 31, 2016.

We expect the transaction with International Paper to close in fourth quarter 2016.

An analysis and reconciliation of our business segment information to the respective information in the Consolidated Statements of Operations is as follows:



	QUARTER ENDED
DOLLAR AMOUNTS IN MILLIONS	MARCH 2016			MARCH 2015
Sales to unaffiliated customers:
Timberlands	$	387		$	323
Real Estate & ENR	39			34
Wood Products	979			923
Cellulose Fibers	430			447
	1,835			1,727
Intersegment sales:
Timberlands	222			228
Wood Products	22			19
	244			247
Total sales	2,079			1,974
Intersegment eliminations	(244		)	(247		)
Total	$	1,835		$	1,727
Net contribution to earnings:
Timberlands	$	129		$	139
Real Estate & ENR⁽¹⁾	15			23
Wood Products	87			62
Cellulose Fibers⁽²⁾	28			33
	259			257
Unallocated items⁽³⁾	(61		)	(54		)
Net contribution to earnings	198			203
Interest expense, net of capitalized interest	(97		)	(83		)
Earnings before income taxes	101			120
Income taxes	(20		)	(19		)
Net earnings	81			101
Dividends on preference shares	(11		)	(11		)
Net earnings attributable to Weyerhaeuser common shareholders	$	70		$	90


(1)	The Real Estate & ENR segment includes the equity earnings from and investments in and advances to our Real Estate Development Ventures, which are accounted for under the equity method.


(2)	The Cellulose Fibers segment includes the equity earnings from and investments in and advances to our newsprint and publishing papers venture, which is accounted for under the equity method.

(3)

Unallocated items are gains or charges not related to or allocated to an individual operating segment. They include a portion of items such as: share-based compensation, pension and postretirement costs, foreign exchange transaction gains and losses associated with financing, equity earnings from our Timberland Venture (as defined and described in Note 6: Equity Method Investments), the elimination of intersegment profit in inventory and the LIFO reserve.

A reconciliation of our business segment total assets to total assets in the Consolidated Balance Sheet is as follows:



DOLLAR AMOUNTS IN MILLIONS	MARCH 31, 2016		DECEMBER 31, 2015
Total Assets:
Timberlands and Real Estate & ENR⁽¹⁾	$	15,447	$	7,260
Wood Products	1,838		1,541
Cellulose Fibers	1,980		1,984
Unallocated items	2,514		1,685
Total	$	21,779	$	12,470


(1)	Assets attributable to the Real Estate & ENR business segment are combined with total assets for the Timberlands segment because we do not produce separate balance sheets internally.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

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+ Details

MERGER WITH PLUM CREEK (Notes)

3 Months Ended

Mar. 31, 2016

Business Combinations [Abstract]

Business Combination Disclosure [Text Block]

MERGER WITH PLUM CREEK

On February 19, 2016, we merged with Plum Creek Timber Company, Inc. (Plum Creek). Plum Creek was a REIT that primarily owned and managed timberlands in the United States. Plum Creek also produced wood products, developed opportunities for mineral and other natural resource extraction, and sold real estate properties. The merger combined the two industry leaders. The breadth and diversity of our combined timberlands, real estate, energy and natural resources assets, and wood products operations position Weyerhaeuser to capitalize on the improving housing market and to continue to capture higher and better use land values across the combined portfolio.

Under the merger agreement, each issued and outstanding share of Plum Creek common stock was exchanged for 1.60 Weyerhaeuser common shares, with cash paid in lieu of any fractional shares. Upon consummation of the merger, all outstanding Plum Creek stock options (all fully vested as of the merger date) and restricted stock units were converted into Weyerhaeuser stock options and restricted stock units, after giving effect to the 1.60 exchange ratio. Because the Plum Creek stock options are fully vested and relate to services rendered to Plum Creek prior to the merger, the replacement stock options are also fully vested and their fair value is included in the consideration transferred. Replacement restricted stock units relate to services to be performed post-merger and therefore are not included in consideration transferred. See additional details about replacement share-based payment awards in Note 14: Share-based Compensation.

The following table summarizes the total consideration transferred in the merger:



DOLLAR AMOUNTS IN MILLIONS, EXCEPT PER-SHARE FIGURES
Number of Plum Creek common shares outstanding⁽¹⁾	174,307,267
Exchange ratio per the merger agreement	1.60
Weyerhaeuser shares issued in exchange for Plum Creek equity⁽²⁾	278,901,479
Price per Weyerhaeuser common share⁽³⁾	$	22.87
Aggregate value of Weyerhaeuser common stock issued			$	6,378
Fair value of stock options⁽⁴⁾			5
Estimated consideration transferred			$	6,383


(1)	The number of shares of Plum Creek common stock issued and outstanding as of February 19, 2016.


(2)	Total shares issued net of partial shares settled in cash.


(3)	The closing price of Weyerhaeuser common stock on the NYSE on February 19, 2016.


(4)	The estimated fair value of Plum Creek stock options for pre-merger services rendered.

The company recognized approximately $110 million and $14 million of merger-related costs that were expensed during the first quarter of 2016 and the full year of 2015, respectively. See Note 15: Charges for Integration and Restructuring, Closures, and Asset Impairments for descriptions of the components of merger-related costs. These costs are included in "Charges for integration and restructuring, closures and asset impairments" in our Consolidated Statement of Operations.

The amount of revenue and loss before income taxes from acquired Plum Creek operations included in our Consolidated Statement of Operations from the merger date to March 31, 2016 are as follows:



DOLLAR AMOUNTS IN MILLIONS	MARCH 2016
Net sales	$	126
Loss before income taxes	$	31

Summarized unaudited pro forma information that presents combined amounts as if this merger occurred at the beginning of 2015 is as follows:



	QUARTER ENDED
DOLLAR AMOUNTS IN MILLIONS, EXCEPT PER-SHARE FIGURES	MARCH 2016		MARCH 2015
Net sales	$	1,991	$	2,125
Net earnings attributable to Weyerhaeuser common shareholders	$	164	$	103
Basic earnings per share attributable to Weyerhaeuser common shareholders	$	0.21	$	0.13
Diluted earnings per share attributable to Weyerhaeuser common shareholders	$	0.21	$	0.13

Pro forma net earnings attributable to Weyerhaeuser common shareholders excludes $131 million non-recurring merger-related costs (net of tax) incurred in the first quarter of 2016. No non-recurring merger-related costs were incurred during the first quarter of 2015. Pro forma data may not be indicative of the results that would have been obtained had these events occurred at the beginning of the periods presented, nor is it intended to be a projection of future results.

Weyerhaeuser has accounted for the merger transaction as the acquirer and has applied the acquisition method of accounting. Under the acquisition method, the assets acquired and liabilities assumed by Weyerhaeuser from Plum Creek were recorded as of the date of the acquisition at their respective estimated fair values.

Our March 31, 2016 consolidated balance sheet includes the assets and liabilities of Plum Creek, which have been measured at fair value as of the merger date. The fair values of the assets acquired and liabilities assumed were preliminarily determined using the income, cost and market approaches. The fair value measurements were generally based on significant inputs that are not observable in the market and thus represent Level 3 measurements as defined in ASC 820, Fair Value Measurement, with the exception of certain long-term debt instruments assumed in the acquisition that can be valued using observable market inputs and are therefore Level 2 measurements. The income approach was primarily used to value acquired timberlands, minerals and mineral rights, equity investments in the Timberland Venture and Real Estate Development Ventures, and the note payable to the Timberland Venture. The income approach estimates fair value for an asset based on the present value of cash flow projected to be generated by the asset. Projected cash flows are discounted at rates of return that reflect the relative risk of achieving the cash flows and the time value of money. The cost approach, which estimates value by determining the current cost of replacing an asset with another of equivalent economic utility, was used, as appropriate, for property and equipment. The cost to replace a given asset reflects the estimated reproduction or replacement cost for the property, less an allowance for loss in value due to depreciation. The market approach was primarily used to value higher and better use real estate tracts included within acquired timberlands, certain land and building assets included within acquired property and equipment, and long-term debt instruments. The market approach estimates fair value for an asset based on values of recent comparable transactions.

Preliminary estimated fair values of identifiable assets acquired and liabilities assumed as of the acquisition date are as follows:



DOLLAR AMOUNTS IN MILLIONS	FEBRUARY 19, 2016
Current assets	$	128
Timber and timberlands	8,124
Minerals and mineral rights	312
Property and equipment	272
Equity investment in Timberland Venture	876
Equity investment in Real Estate Development Ventures	88
Other assets	163
Total assets acquired	$	9,963

Current liabilities	$	610
Long-term debt	2,056
Note Payable to Timberland Venture	837
Other liabilities	77
Total liabilities assumed	$	3,580

Net assets acquired	$	6,383

These estimated fair values are preliminary in nature and subject to adjustments, which could be material. We have not identified any material unrecorded pre-merger contingencies where the related asset, liability or impairment is probable and the amount can be reasonably estimated. We are currently in the process of finalizing our valuations related to the following:


•	timber and timberlands,


•	minerals and mineral rights,


•	property and equipment,


•	acquired equity method investments, and


•	other contractual rights and obligations.

Our valuations will be finalized when certain information arranged to be obtained has been received and our review of that information has been completed. Prior to the finalization of the purchase price allocation, if information becomes available that would indicate it is probable that such events had occurred and the amounts can be reasonably estimated, such items will be included in the final purchase price allocation.

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Section 50
-Paragraph 5
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 15: http://www.xbrl.org/2003/role/presentationRef
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+ Details

NET EARNINGS PER SHARE

3 Months Ended

Mar. 31, 2016

NET EARNINGS PER SHARE

NET EARNINGS PER SHARE AND SHARE REPURCHASES

NET EARNINGS PER SHARE

Our basic and diluted earnings per share attributable to Weyerhaeuser shareholders were:


•	$0.11 during first quarter 2016; and


•	$0.17 during first quarter 2015.

Basic earnings per share is net earnings available to common shareholders divided by the weighted average number of our outstanding common shares, including stock equivalent units where there is no circumstance under which those shares would not be issued.

Diluted earnings per share is net earnings available to common shareholders divided by the sum of the weighted average number of our outstanding common shares and the effect of our outstanding dilutive potential common shares:



	QUARTER ENDED
SHARES IN THOUSANDS	MARCH 2016	MARCH 2015
Weighted average number of outstanding common shares – basic	632,004	523,426
Dilutive potential common shares:
Stock options	2,060	2,962
Restricted stock units	409	415
Performance share units	399	620
Preference shares	—	—
Total effect of outstanding dilutive potential common shares	2,868	3,997
Weighted average number of outstanding common shares – dilutive	634,872	527,423

We use the treasury stock method to calculate the effect of our outstanding stock options, restricted stock units and performance share units. Share-based payment awards that are contingently issuable upon the achievement of specified performance or market conditions are included in our diluted earnings per share calculation in the period in which the conditions are satisfied.

We use the if-converted method to calculate the effect of our outstanding preference shares. In applying the if-converted method, conversion is not assumed for purposes of computing diluted earnings per share if the effect would be antidilutive. Preference shares are antidilutive whenever the amount of the dividend declared in or accumulated for the current period per common share obtainable on conversion exceeds diluted earnings per share exclusive of the preference shares.

Preference shares are evaluated for participation on a quarterly basis to determine whether two-class presentation is required. Preference shares are considered to be participating as of the financial reporting period end to the extent they would participate in dividends paid to common shareholders. Preference shares are not considered participating for the quarter ended March 31, 2016. Under the provisions of the two-class method, basic and diluted earnings per share would be presented for both preference and common shareholders.

Potential Shares Not Included in the Computation of Diluted Earnings per Share

The following shares were not included in the computation of diluted earnings per share because they were either antidilutive or the required performance or market conditions were not met. Some or all of these shares may be dilutive potential common shares in future periods.



	QUARTER ENDED
SHARES IN THOUSANDS	MARCH 2016	MARCH 2015
Stock options	6,215	1,128
Performance share units	534	358
Preference shares	25,307	24,988

STOCK REPURCHASE PROGRAM

During first quarter 2016, we repurchased 31,367,541 shares of common stock for $863 million (including transaction fees) under the 2016 Share Repurchase Authorization. The 2016 Share Repurchase Authorization was approved in November 2015 by our Board of Directors and authorized management to repurchase up to $2.5 billion of outstanding shares subsequent to the closing of our merger with Plum Creek. This new authorization replaced the August 2015 share repurchase authorization. Transaction fees incurred for repurchases are not counted as use of funds authorized for repurchases under the 2016 Share Repurchase Authorization. All common stock purchases under the stock repurchase program were made in open-market transactions. As of March 31, 2016, we had remaining authorization of $1,638 million for future stock repurchases.

We record share repurchases upon trade date as opposed to the settlement date when cash is disbursed. We record a liability to account for repurchases that have not been cash settled. Unsettled repurchases consisted of 2,128,645 shares totaling $66 million as of March 31, 2016. There were no unsettled repurchases as of March 31, 2015, or December 31, 2015.

From April 1, 2016 to April 30, 2016 we repurchased 12,288,096 shares of common stock for $387 million under the 2016 Share Repurchase Authorization. As of April 30, 2016, we had remaining authorization of $1,251 million.

INVENTORIES

3 Months Ended

Mar. 31, 2016

INVENTORIES

Inventories include raw materials, work-in-process and finished goods.



DOLLAR AMOUNTS IN MILLIONS	MARCH 31, 2016		DECEMBER 31, 2015
LIFO Inventories:
Logs and chips	$	28	$	15
Lumber, plywood and panels	57		48
Pulp and paperboard	109		111
Other products	13		11
FIFO or moving average cost inventories:
Logs and chips	71		38
Lumber, plywood, panels and engineered wood products	94		75
Pulp and paperboard	37		32
Other products	100		90
Materials and supplies	168		148
Total	$	677	$	568

LIFO – the last-in, first-out method – applies to major inventory products held at our U.S. domestic locations. We began to use the LIFO method for domestic products in the 1940s as required to conform with the tax method elected. Subsequent acquisitions of entities added new products under the FIFO – the first-in, first-out method – or moving average cost methods that have continued under those methods. The FIFO or moving average cost methods applies to the balance of our domestic raw material and product inventories as well as for all material and supply inventories and all foreign inventories. If we used FIFO for all inventories, our stated inventories would have been higher by $123 million as of March 31, 2016 and $124 million as of December 31, 2015.

EQUITY METHOD INVESTMENTS (Notes)

3 Months Ended

Mar. 31, 2016

Equity Method Investments and Joint Ventures [Abstract]

Equity Method Investments and Joint Ventures Disclosure [Text Block]

EQUITY METHOD INVESTMENTS

We use the equity method to account for our investments in various joint ventures. The following tables summarize the current period equity earnings or loss from and our respective balances of our investments in and advances to each of our joint ventures:



	QUARTER ENDED
DOLLAR AMOUNTS IN MILLIONS	MARCH 2016			MARCH 2015
Equity earnings (loss) from joint ventures:
Newsprint and publishing papers venture	$	(2	)	$	(6	)
Timberland Venture	5			—
Real Estate Development Ventures	—			—
Total	$	3		$	(6	)

	MARCH 31, 2016			DECEMBER 31, 2015
Investment in and advances to joint ventures:
Newsprint and publishing papers venture	$	72		$	74
Timberland Venture	852			—
Real Estate Development Ventures	87			—
Total	$	1,011		$	74

There have been no material changes with respect to our newsprint and publishing papers venture as disclosed in our 2015 Annual Report on Form 10-K.

EQUITY METHOD INVESTMENTS ACQUIRED THROUGH OUR MERGER WITH PLUM CREEK

Through our merger with Plum Creek on February 19, 2016, we acquired equity interests in the Real Estate Development Ventures and the Timberland Venture. Additionally, through the merger Weyerhaeuser assumed the benefits and obligations associated with the formation of Twin Creeks Timber, LLC a timberland joint venture (Twin Creeks Venture). The Twin Creeks Venture was funded with initial capital contributions on April 1, 2016.

Real Estate Development Ventures

WestRock-Charleston Land Partners, LLC (WR-CLP) is a limited liability company which holds 21,000 acres of residential and commercial real estate development properties, currently under development (Class A Properties) and 51,000 acres of high-value development lands (Class B Properties) (referred to collectively as the Real Estate Development Ventures). We have a 3% interest in Class A Properties and a 50% interest in Class B Properties. WestRock Company is the other member of WR-CLP and owns 97% of the Class A Properties and 50% of the Class B Properties. The Company uses the equity method of accounting for both its Class A and Class B interests. Our share of the equity earnings are included in the net contribution to earnings of our Real Estate & ENR segment.

Timberland Venture

We hold a preferred and common interest in Southern Diversified Timber, LLC, a timberland joint venture (Timberland Venture), which includes 100% of the preferred interests and 9% of the common interests. The Timberland Venture’s other member, an affiliate of Campbell Global LLC, holds 91% of the Timberland Venture’s common interests. The activities of the Timberland Venture consist primarily of owning timberlands and entering into cutting contracts with an affiliate of Campbell Global for the selling and harvesting of timber. An affiliate of Campbell Global is the manager of the Timberland Venture. Our investment in and share of the equity earnings of the Timberland Venture is not attributed to one of our business segments, and is reported as an Unallocated Item.

The preferred interest is entitled to a cumulative preferred return equal to 7.875% per annum. No distributions can be made on the common interests until all current period and prior period preferred returns have been paid. Both our preferred and common interests are accounted for based on the equity method of accounting. Equity earnings of the Timberland Venture are first allocated to our preferred interest to the extent of our preferred return, with any excess earnings allocated among the common interests based on ownership percentage. All of the equity earnings will be allocated to our preferred interest in years in which our preferred return equals or exceeds the earnings of the Timberland Venture. To the extent of shortfall in equity earnings (cumulative preferred return in excess of allocated equity earnings), future years’ excess earnings will be allocated to our preferred interest until the cumulative shortfall is eliminated.

The Timberland Venture can be liquidated at any time with the consent of both members. From October 1, 2017 to March 31, 2018 Weyerhaeuser has the sole right to redeem our interest in the Timberland Venture. The other member has a similar redemption right until June 30, 2016. Upon liquidation or redemption, the members’ interests will be adjusted to reflect the fair value of the Timberland Venture’s net assets. The adjustment would first be allocated to our preferred interest to the extent that any accumulated shortfall in net income attributable to our preferred interest exists, but only to the extent that the fair value of the net assets of the Timberland Venture exceed book basis.

Twin Creeks Venture

Prior to our merger, Plum Creek entered into an agreement with third party institutional investors to form the Twin Creeks Venture. Weyerhaeuser assumed the benefits and obligations associated with the Twin Creeks Venture in connection with our merger with Plum Creek. Our initial contribution to the Twin Creeks Venture was made on April 1, 2016. Weyerhaeuser contributed approximately 260,000 acres of timberlands in exchange for a 21% ownership interest and cash of $440 million. The other partners contributed total cash of $440 million for a 79% ownership interest. Our transactions and related activities with Twin Creeks will be reported within our Timberlands business segment.

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS

3 Months Ended

Mar. 31, 2016

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS

The components of net periodic benefit costs (credits) are:



	PENSION
	QUARTER ENDED
DOLLAR AMOUNTS IN MILLIONS	MARCH 2016			MARCH 2015
Service cost	$	13		$	15
Interest cost	68			65
Expected return on plan assets	(123		)	(118		)
Amortization of actuarial loss	38			44
Amortization of prior service cost	1			1
Accelerated pension costs included in Plum Creek merger-related costs (Note 15)	5			—
Total net periodic benefit cost (credit)	$	2		$	7



	OTHER POSTRETIREMENT BENEFITS
	QUARTER ENDED
DOLLAR AMOUNTS IN MILLIONS	MARCH 2016			MARCH 2015
Interest cost	$	2		$	3
Amortization of actuarial loss	2			2
Amortization of prior service credit	(2		)	(2		)
Total net periodic benefit cost	$	2		$	3

ASSUMED PLANS FROM MERGER WITH PLUM CREEK

Upon our merger with Plum Creek, we assumed one qualified pension plan and two non-qualified pension plans. All active participants in these plans became fully vested and the plans were frozen as of February 19, 2016. The cumulative funded status of the assumed plans as of February 19, 2016 was a net liability of $62 million.

The expected return on assets for the qualified plan assumed is 7 percent. Assets of $47 million related to the non-qualified plans are held in a grantor trust and are subject to the claims of creditors in the event of bankruptcy. As a result, these are not considered plan assets and have not been netted against the non-qualified pension liability. These assets are included in "Other assets" in our Consolidated Balance Sheet.

During the first quarter, we recognized $5 million of pension benefit costs from change in control provisions for certain Plum Creek executives. These enhanced pension benefits were triggered by changes in control and retention decisions made after the completion of the merger (see Note 15: Charges for Integration and Restructuring, Closures and Impairments).

FAIR VALUE OF PENSION PLAN ASSETS AND OBLIGATION

As disclosed in our Annual Report on Form 10-K for the year ended December 31, 2015, the value reported for our pension plan assets at the end of 2015 was estimated. Additional information regarding the year-end values generally becomes available to us during the first half of the following year. We expect to complete the valuation of our pension plan assets during second quarter 2016. The final adjustments could affect net pension periodic benefit cost.

Consistent with accounting for the merger as the acquirer in a business combination (see Note 3: Merger with Plum Creek), pension assets and benefit obligations were remeasured to reflect their fair value as of the date of the acquisition. This included updating asset values, updating discount rates to reflect market conditions as of the date of the merger, and freezing benefit accruals. The fair value of these items as of February 19, 2016 were as follows:


•	$137 million qualified pension plan assets


•	$149 million qualified pension plan projected benefit obligation


•	$50 million non-qualified pension plan projected benefit obligation

EXPECTED CONTRIBUTIONS AND BENEFIT PAYMENTS

In 2016 we expect to:


•	be required to contribute approximately $16 million for our Canadian registered plan;


•	be required to contribute or make benefit payments for our Canadian nonregistered plans of $3 million;


•	make benefit payments of $52 million for our U.S. nonqualified pension plans, including $33 million of benefit payments for plans assumed from Plum Creek to be paid out of assets held in grantor trusts; and


•	make benefit payments of $22 million for our U.S. and Canadian other postretirement plans.

We do not anticipate making a contribution to our U.S. qualified pension plans for 2016.

VARIABLE INTEREST ENTITIES VARIABLE INTEREST ENTITIES	3 Months Ended
VARIABLE INTEREST ENTITIES VARIABLE INTEREST ENTITIES	Mar. 31, 2016
Variable Interest Entity [Line Items]
Variable Interest Entity Disclosure [Text Block]	VARIABLE INTEREST ENTITIES See our Annual Report on Form 10-K for the year ended December 31, 2015 for information regarding Weyerhaeuser's special-purpose entities. As a result of the acquisition of Plum Creek, we acquired interests in certain joint ventures as described in Note 6: Equity Method Investments that are variable interest entities. REAL ESTATE DEVELOPMENT VENTURES WestRock-Charleston Land Partners, LLC (WR-CLP) is a variable interest entity. WR-CLP is financed by regular capital calls from the manager of WR-CLP in proportion to a member’s ownership interest. If a member does not make a capital contribution, the member’s ownership interest is diluted. The company has committed to make additional capital calls of up to $29 million during the years 2016 to 2020. The company does not intend to provide any additional sources of financing for WR-CLP. Weyerhaeuser is not the primary beneficiary of WR-CLP. We consider the activities that most significantly impact the economic performance of WR-CLP to be the day-to-day operating decisions along with the oversight responsibilities for the real estate development projects and properties. WestRock Company (the other equity member) has the power to direct the activities of WR-CLP that most significantly impact its economic performance through its ability to manage the day-to-day operations of WR-CLP. WestRock Company also has the ability to control all management decisions associated with all Class A and Class B Properties through its majority representation on the board of directors for the Class A Properties and due to its equal representation on the board of directors for the Class B Properties. Our maximum exposure to loss is $87 million, the carrying amount of our investment in WR-CLP at March 31, 2016, plus required future capital contributions we make. TIMBERLAND VENTURE The Timberland Venture is a variable interest entity. Aside from quarterly interest payments on the Note Payable to Timberland Venture, the company has not provided financing or other support to the venture. The venture generates sufficient cash from operating activities to finance its operations. We are not the primary beneficiary of the Timberland Venture. The company does not manage the day-to-day operations of the Timberland Venture, has only limited protective rights and its involvement is generally limited to receiving distributions on its preferred and common interests. We are not the primary beneficiary because we do not direct the activities that most significantly impact the Timberland Venture’s economic performance. We believe that the activities that most significantly impact the Timberland Venture’s economic performance include managing the timberlands along with the timing and extent of the harvesting activities, neither of which we control. Our maximum exposure to loss is $852 million, the carrying amount of the investment at March 31, 2016. Generally, losses are first allocated among the common interests based on positive capital accounts in which we hold a 9% common interest. Losses would be allocated to our preferred interest only when losses have reduced capital accounts comprising the common interests to zero.

ACCRUED LIABILITIES

3 Months Ended

Mar. 31, 2016

ACCRUED LIABILITIES

Accrued liabilities were comprised of the following:



DOLLAR AMOUNTS IN MILLIONS	MARCH 31, 2016		DECEMBER 31, 2015
Wages, salaries and severance pay	$	150	$	150
Pension and other postretirement benefits	79		44
Vacation pay	52		46
Taxes – Social Security and real and personal property	36		24
Interest	100		104
Customer rebates and volume discounts	34		46
Deferred income	37		52
Other	107		79
Total	$	595	$	545

LONG-TERM DEBT AND LINES OF CREDIT LONG-TERM DEBT AND LINES OF CREDIT

3 Months Ended

Mar. 31, 2016

Debt Disclosure [Abstract]

Debt Disclosure [Text Block]

LONG-TERM DEBT AND LINES OF CREDIT

This note provides details about our:


•	long-term debt assumed in the Plum Creek merger and


•	new term loans issued.

LONG-TERM DEBT ASSUMED IN THE PLUM CREEK MERGER

Through our merger with Plum Creek, Weyerhaeuser assumed long-term debt instruments consisting of:


•	two issuances of publicly traded Senior Notes,


•	an Installment Note (defined and described below) and


•	the Note Payable to Timberland Venture (defined and described below).

Concurrent with the merger, Weyerhaeuser repaid in full the outstanding balances of Plum Creek's Revolving Line of Credit and Term Loan using $720 million of cash on hand.

Senior Notes

The assumed Senior Notes are publicly traded and were issued by Plum Creek Timberlands, L.P. (PC Timberlands) and are fully and unconditionally guaranteed by Weyerhaeuser Company as of the acquisition date. See Note 18: Condensed Consolidating Financial Information for issuer and guarantor financial information. There were two separate issuances of Senior Notes: $569 million (principal) of 4.70% notes which matures in 2021 and $325 million (principal) of 3.25% notes which matures in 2023. The Senior Notes are redeemable prior to maturity; however, they are subject to a premium on redemption, which is based upon interest rates of U.S. Treasury securities having similar average maturities.

Through preliminary acquisition accounting the Senior Notes were recognized at estimated fair values of $614 million for the 4.70% notes and $324 million for the 3.25% notes as of the acquisition date. The differences between cash interest payments and the amounts recorded as interest expense at the effective market rates will reduce the carrying values of the notes to the principal amounts at maturity.

Installment Note

We have assumed an installment note (Installment Note) payable to WestRock Land and Development, LLC (WR LD) that was issued in connection with Plum Creek's acquisition of certain timberland assets. The principal balance of the Installment Note is $860 million. Following the issuance, WR LD pledged the installment note to certain banks in the farm credit system. The annual interest rate on the Installment Note is fixed at 5.207%. Interest is paid semi-annually with the principal due upon maturity in December 2023. The term may be extended at the request of the holder if the company at the time of the request intends to refinance all or a portion of the Installment Note for a term of five years or more. The Installment Note is generally not redeemable prior to maturity except in certain limited circumstances and could be subject to a premium on redemption.

The company receives patronage refunds under the Installment Note. Patronage refunds are distributions of profits from banks in the farm credit system, which are cooperatives that are required to distribute profits to their members. Patronage distributions, which are made in either cash or stock, are received in the year after they were earned and are recorded as offsets to interest expense.

Through preliminary acquisition accounting, the Installment Note was recognized at an estimated fair value of $892 million as of the acquisition date. The difference between the cash interest payments and the amount being recorded as interest expense at the effective market rate will reduce the carrying value of the Installment Note to the principal amount at the maturity date.

Note Payable to Timberland Venture

We have assumed a promissory note payable to Timberland Venture (Note Payable to Timberland Venture) that has a principal balance of $783 million. The annual interest rate on the Note Payable to Timberland Venture is fixed at 7.375%. Interest is paid quarterly with the principal due upon maturity. The note matures on October 1, 2018 but may be extended until October 1, 2020 at the election of Weyerhaeuser. The note is not redeemable prior to maturity.

Through preliminary acquisition accounting, the Note Payable to Timberland Venture was recognized at an estimated fair value of $837 million as of the acquisition date. The difference between the cash interest payments and the amount being recorded as interest expense at the effective market rate will reduce the carrying value of the note to the principal amount at the maturity date.

The Timberland Venture is a related party, as described in Note 6: Equity Method Investments.

NEW TERM LOANS ISSUED

During February 2016 and subsequent to completion of the Plum Creek merger, we entered into a $600 million 18-month senior unsecured term loan maturing in August 2017. Borrowings are currently at LIBOR plus 1.05%. As of March 31, 2016 we had $600 million outstanding under this facility.

During March 2016, we entered into a $1.9 billion 18-month senior unsecured term loan maturing in September 2017. Borrowings are currently at LIBOR plus 1.05%. At March 31, 2016, we had $500 million outstanding under this facility.

FAIR VALUE OF FINANCIAL INSTRUMENTS

3 Months Ended

Mar. 31, 2016

FAIR VALUE OF FINANCIAL INSTRUMENTS [Line Items]

FAIR VALUE OF FINANCIAL INSTRUMENTS

The estimated fair values and carrying values of our long-term debt consisted of the following:



	MARCH 31, 2016				DECEMBER 31, 2015
DOLLAR AMOUNTS IN MILLIONS	CARRYING VALUE		FAIR VALUE (LEVEL 2)		CARRYING VALUE		FAIR VALUE (LEVEL 2)
Long-term Debt – fixed rate	$	6,156	$	6,993	$	4,326	$	5,070
Long-term Debt – variable rate	1,647		1,650		549		550
Note Payable to Timberland Venture	835		843		—		—
Total Debt	$	8,638	$	9,486	$	4,875	$	5,620

To estimate the fair value of fixed rate long-term debt, we used the following valuation approaches:


•	market approach – based on quoted market prices we received for the same types and issues of our debt; or


•	income approach – based on the discounted value of the future cash flows using market yields for the same type and comparable issues of debt.

We believe that our variable rate long-term debt instruments have net carrying values that approximate their fair values with only insignificant differences.

The fair value of the Note Payable to Timberland Venture is estimated using a market approach based on quoted market prices we received for comparable issues of debt.

The inputs to these valuations are based on market data obtained from independent sources or information derived principally from observable market data. The difference between the fair value and the carrying value represents the theoretical net premium or discount we would pay or receive to retire all debt at the measurement date.

FAIR VALUE OF OTHER FINANCIAL INSTRUMENTS

We believe that our other financial instruments, including cash and cash equivalents, short-term investments, mutual fund investments held in grantor trusts, receivables, and payables, have net carrying values that approximate their fair values with only insignificant differences. This is primarily due to:


•	the short-term nature of these instruments,


•	carrying short-term investments at expected net realizable value,


•	the allowance for doubtful accounts.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

LEGAL PROCEEDINGS, COMMITMENTS AND CONTINGENCIES

3 Months Ended

Mar. 31, 2016

LEGAL PROCEEDINGS, COMMITMENTS AND CONTINGENCIES

This note provides details about our:


•	legal proceedings and


•	environmental matters.

LEGAL PROCEEDINGS

We are party to various legal proceedings arising in the ordinary course of business. We are not currently a party to any legal proceeding that management believes could have a material adverse effect on our long-term consolidated financial position, results of operations or cash flows. See Note 17: Income Taxes for a discussion of a tax proceeding involving the company and its consolidated subsidiaries.

ENVIRONMENTAL MATTERS

Our environmental matters include:


•	site remediation and


•	asset retirement obligations.

Site Remediation

Under the Comprehensive Environmental Response Compensation and Liability Act – commonly known as the Superfund – and similar state laws, we:


•	are a party to various proceedings related to the cleanup of hazardous waste sites and


•	have been notified that we may be a potentially responsible party related to the cleanup of other hazardous waste sites for which proceedings have not yet been initiated.

We have received notification from the Environmental Protection Agency (the "EPA") and have acknowledged that we are a potentially responsible party in a portion of the Kalamazoo River Superfund site in southwest Michigan. Our involvement in the remediation site is based on our former ownership of the Plainwell, Michigan mill located within the remediation site. In 2015 we received invitations from the EPA to negotiate an administrative order on consent for a contaminant removal action for a portion of the site comprising a stretch of the river approximately 1.7 miles long that the EPA refers to as the Otsego Township Dam Area. Several other companies also operated upstream pulp mills, and two other parties received the same invitations. On April 14, 2016, the EPA issued an administrative order to the company and the other parties, the terms and scope of which are generally consistent with the company’s and the other parties’ discussions with the EPA. The company and the other parties expect to jointly implement the administrative order. At this time we do not expect to incur material losses related to the implementation of the administrative order.

As of March 31, 2016, our total accrual for future estimated remediation costs on the active Superfund sites and other sites for which we are responsible was approximately $37 million. These reserves are recorded in "Accrued liabilities" and "Other liabilities" in our Consolidated Balance Sheet. The accrual has not changed materially since the end of 2015.

Asset Retirement Obligations

We have obligations associated with the retirement of tangible long-lived assets consisting primarily of reforestation obligations related to forest management licenses in Canada and obligations to close and cap landfills. As of March 31, 2016, our accrued balance for these obligations was $38 million. These obligations are recorded in "Accrued liabilities" and "Other liabilities" in our Consolidated Balance Sheet. The accruals have not changed materially since the end of 2015.

Some of our sites have materials containing asbestos. We have met our current legal obligation to identify and manage these materials. In situations where we cannot reasonably determine when materials containing asbestos might be removed from the sites, we have not recorded an accrual because the fair value of the obligation cannot be reasonably estimated.

CUMULATIVE OTHER COMPREHENSIVE INCOME (LOSS)

3 Months Ended

Mar. 31, 2016

CUMULATIVE OTHER COMPREHENSIVE INCOME (LOSS)

Changes in amounts included in our cumulative other comprehensive income (loss) by component are:



			PENSION						OTHER POSTRETIREMENT BENEFITS
DOLLAR AMOUNTS IN MILLIONS	Foreign currency translation adjustments		Actuarial losses			Prior service costs			Actuarial losses			Prior service credits			Unrealized gains on available-for-sale securities		Total
Beginning balance as of December 31, 2015	$	207	$	(1,372	)	$	(11	)	$	(77	)	$	35		$	6	$	(1,212	)
Other comprehensive income (loss) before reclassifications	41		(22		)	—			—			—			—		19
Income taxes	—		6			—			—			—			—		6
Net other comprehensive income (loss) before reclassifications	41		(16		)	—			—			—			—		25
Amounts reclassified from cumulative other comprehensive income (loss)⁽¹⁾	—		38			1			2			(2		)	—		39
Income taxes	—		(13		)	(1		)	(1		)	—			—		(15		)
Net amounts reclassified from cumulative other comprehensive income (loss)	—		25			—			1			(2		)	—		24
Total other comprehensive income (loss)	41		9			—			1			(2		)	—		49
Ending balance as of March 31, 2016	$	248	$	(1,363	)	$	(11	)	$	(76	)	$	33		$	6	$	(1,163	)
(1) Actuarial losses and prior service credits (cost) are included in the computation of net periodic benefit costs (credits). See Note 7: Pension and Other Postretirement Benefit Plans.

- Definition

The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e689-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669619-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e640-108580

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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-Section 45
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e716-108580

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e709-108580

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e681-108580

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Reclassification Adjustments
-URI http://asc.fasb.org/extlink&oid=6522872

+ Details

SHARE-BASED COMPENSATION

3 Months Ended

Mar. 31, 2016

SHARE-BASED COMPENSATION

In first quarter 2016, we granted 6,121,835 stock options, 1,954,796 restricted stock units (RSUs), 428,794 performance share units (PSUs) and 106,752 stock appreciation rights. In addition, 947,628 outstanding RSUs and 268,197 outstanding PSUs vested during first quarter 2016. A total of 1,033,647 shares of common stock were issued as a result of RSU vesting, PSU vesting and stock option exercises.

SHARE-BASED COMPENSATION RESULTING FROM OUR MERGER WITH PLUM CREEK

Included in the award activity above are replacement awards granted as a result of the merger with Plum Creek. Eligible outstanding Plum Creek stock options, restricted stock unit and deferred stock unit awards were converted into equivalent equity awards with respect to Weyerhaeuser Common Shares, after giving effect to the appropriate adjustments to reflect the consummation of the merger. In total, we issued replacement awards consisting of 1,953,128 stock options and 1,248,006 RSUs. We also assumed 289,910 value management awards (VMAs) through the merger with Plum Creek.

Replacement Stock Option Awards

The replacement stock option awards issued as a result of the merger with Plum Creek have similar exercise provisions as the terms of Weyerhaeuser current awards. All replacement stock option awards were fully vested prior to the date of the merger, so no expense will be recorded by Weyerhaeuser. The value of the replacement stock option awards was $5 million, which was included in the equity consideration issued in the merger as described in Note 3: Merger with Plum Creek.

Replacement Restricted Stock Unit Awards

The replacement RSUs issued as a result of the merger with Plum Creek have similar vesting provisions as the terms of existing Weyerhaeuser restricted stock unit awards. Expense for replacement RSUs will continue to be recognized over the remaining service period unless a qualifying termination occurs. A qualifying termination of an awardee will result in acceleration of vesting and expense recognition in the period that the qualifying termination occurs. Qualifying terminations during the first quarter resulted in accelerated vesting of 501,135 of the replacement RSUs and recognition of $14 million of expense. This accelerated expense is included in merger-related integration costs as described in Note 15: Charges for Integration and Restructuring, Closures and Asset Impairments.

Value Management Awards

Following the merger the VMAs assumed by Weyerhaeuser were valued at target. All outstanding VMAs, if earned, will vest December 31, 2017 and be paid in the first quarter of 2018. The VMAs are classified and accounted for as liabilities, as they will be cash settled upon vesting. The expense recognized over the remaining performance period will equal the cash value of an award as of the last day of the performance period multiplied by the number of awards that are earned. Expense for VMAs will continue to be recognized over the remaining service period unless a qualifying termination occurs. A qualifying termination of an awardee will result in acceleration of vesting and expense recognition in the period that the qualifying termination occurs. Qualifying terminations during the first quarter resulted in $5 million of expense recognized. This accelerated expense is included in merger-related integration costs as described in Note 15: Charges for Integration and Restructuring, Closures and Asset Impairments.

STOCK OPTIONS

Excluding replacement awards granted as a result of the merger, the weighted average exercise price of stock options granted to date in 2016 was $23.09. The vesting and post-termination vesting terms for stock options granted to date in 2016 were as follows:


•	vest ratably over four years, except for the replacement stock option awards granted as a result of the Plum Creek merger, which were fully vested as of the grant date;


•	vest or continue to vest in the event of death while employed, disability or retirement at an age of at least 62;


•	continue to vest upon retirement at an age of at least 62, but a portion of the grant forfeits if retirement occurs before the one year anniversary of the grant;


•	continue to vest for one year in the event of involuntary termination when the retirement criteria has not been met; and


•	stop vesting for all other situations including early retirement prior to age 62.

Weighted Average Assumptions Used in Estimating the Value of Stock Options Granted in 2016



	Stock Options⁽¹⁾
Expected volatility	25.43		%
Expected dividends	5.37		%
Expected term (in years)	4.95
Risk-free rate	1.28		%
Weighted average grant date fair value		$2.73


(1)	Weighted average assumptions presented do not include the replacement stock options awards issued as consideration for our merger with Plum Creek.

RESTRICTED STOCK UNITS

Excluding replacement awards granted as a result of the merger, the weighted average fair value of the restricted stock units granted in 2016 was $23.09. The vesting provisions for restricted stock units granted in 2016 were as follows:


•	vest ratably over four years;


•	immediately vest in the event of death while employed or disability;


•	continue to vest upon retirement at an age of at least 62, but a portion of the grant forfeits if retirement occurs before the one year anniversary of the grant;


•	continue vesting for one year in the event of involuntary termination when the retirement criteria has not been met; and


•	will forfeit upon termination of employment in all other situations including early retirement prior to age 62.

PERFORMANCE SHARE UNITS

The weighted average grant date fair value of PSUs granted in 2016 was $20.83.

The final number of shares granted in 2016 will range from 0 percent to 150 percent of each grant's target, depending upon actual company performance.

The ultimate number of performance share units earned is based on three measures:


•	our relative total shareholder return (TSR) ranking measured against the S&P 500 over a three year period;


•	our relative TSR ranking measured against an industry peer group of companies over a three year period; and


•	achievement of Plum Creek merger cost synergy targets.

The vesting provisions for performance share units granted in 2016 were as follows:


•	vest 100 percent on the third anniversary of the grant date as long as the individual remains employed by the company;


•	fully vest in the event the participant dies or becomes disabled while employed;


•	continue to vest upon retirement at an age of at least 62, but a portion of the grant forfeits if retirement occurs before the one year anniversary of the grant;


•	continue vesting for one year in the event of involuntary termination when the retirement criteria has not been met and the employee has met the second anniversary of the grant date; and


•	will forfeit upon termination of employment in all other situations including early retirement prior to age 62.

Weighted Average Assumptions Used in Estimating the Value of Performance Share Units Granted in 2016



	Performance Share Units
Performance period	1/1/2016 – 12/31/2018
Valuation date closing stock price	$	23.09
Expected dividends	5.37					%
Risk-free rate	0.48		%	–	0.93	%
Expected volatility	23.57		%	–	28.09	%

STOCK APPRECIATION RIGHTS

Stock appreciation rights are remeasured to reflect the fair value at each reporting period. The following table shows the weighted average assumptions applied to all outstanding stock appreciation rights as of March 31, 2016.

Weighted Average Assumptions Used to Remeasure the Value of Stock Appreciation Rights as of March 31, 2016



	Stock Appreciation Rights
Expected volatility	25.15		%
Expected dividends	4.12		%
Expected term (in years)	2.55
Risk-free rate	0.98		%
Weighted average fair value		$7.52

The vesting and post-termination vesting terms for stock appreciation rights granted in 2016 are the same as for stock options described above.

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References + Details

CHARGES FOR INTEGRATION AND RESTRUCTURING, CLOSURES AND ASSET IMPAIRMENTS

3 Months Ended

Mar. 31, 2016

Restructuring Cost and Reserve [Line Items]

CHARGES FOR RESTRUCTURING, CLOSURES AND ASSET IMPAIRMENTS

CHARGES FOR INTEGRATION AND RESTRUCTURING, CLOSURES AND ASSET IMPAIRMENTS



	QUARTER ENDED
DOLLAR AMOUNTS IN MILLIONS	MARCH 2016		MARCH 2015
Integration and restructuring charges related to our merger with Plum Creek:
Termination benefits	$	45	$	—
Acceleration of share-based compensation related to qualifying terminations (Note 14)	19		—
Acceleration of pension benefits related to qualifying terminations (Note 7)	5		—
Professional services	39		—
Other integration and restructuring costs	2		—
Total integration and restructuring charges related to our merger with Plum Creek	110		—
Charges related to closures and other restructuring activities	7		1
Impairments of long-lived assets	—		13
Total charges for integration and restructuring, closures and impairments	$	117	$	14

During 2016, we incurred and accrued for termination benefits (primarily severance), accelerated share-based payment costs, and accelerated pension benefits based upon actual and expected qualifying terminations of certain employees as a result of restructuring decisions made subsequent to the merger. We also incurred non-recurring professional services costs for investment banking, legal and consulting, and certain other fees directly attributable to our merger with Plum Creek.

During the first quarter 2015, we recognized a noncash impairment charge of $13 million related to a nonstrategic asset held in Unallocated Items. The fair value of the asset was determined using significant unobservable inputs (level 3) based on discounted cash flow model.

Changes in accrued severance related to restructuring during the quarter ended March 31, 2016 were as follows:



DOLLAR AMOUNTS IN MILLIONS
Accrued severance as of December 31, 2015	$	5
Charges	45
Payments	(17		)
Accrued severance as of March 31, 2016	$	33

Accrued severance is recorded within the "Wages, salaries and severance pay" component of "Accrued liabilities" on our Consolidated Balance Sheet as detailed in Note 9: Accrued Liabilities. The majority of the accrued severance balance as of March 31, 2016, is expected to be paid within one year.

OTHER OPERATING COSTS (INCOME), NET

3 Months Ended

Mar. 31, 2016

OTHER OPERATING COSTS (INCOME), NET

Other operating costs (income), net:


•	includes both recurring and occasional income and expense items and


•	can fluctuate from year to year.

ITEMS INCLUDED IN OTHER OPERATING COSTS (INCOME), NET



	QUARTER ENDED
DOLLAR AMOUNTS IN MILLIONS	MARCH 2016			MARCH 2015
Gain on disposition of nonstrategic assets	(36		)	(2		)
Foreign exchange losses (gains), net	(13		)	29
Litigation expense, net	3			5
Other, net	(15		)	(11		)
Total other operating costs (income), net	$	(61	)	$	21

Gain on disposition of nonstrategic assets included a $36 million pretax gain recognized in the first quarter of 2016 on the sale of our Federal Way headquarters campus.

Foreign exchange losses (gains) result from changes in exchange rates, primarily related to our Canadian operations.

INCOME TAXES

3 Months Ended

Mar. 31, 2016

INCOME TAXES

As a REIT, we generally are not subject to federal corporate level income taxes on REIT taxable income that is distributed to shareholders. We are required to pay corporate income taxes on earnings of our TRS, which includes our manufacturing businesses and the portion of our Timberlands and Real Estate & ENR segments' income included in the TRS.

The quarterly provision for income taxes is based on the current estimate of the annual effective tax rate. Our 2016 estimated annual effective tax rate for our TRS is approximately 32 percent, which is lower than the U.S. domestic statutory federal tax rate primarily due to favorable permanent tax deductions and lower foreign tax rates applicable to foreign earnings, partially offset by state income taxes.

Following the merger with Plum Creek in the first quarter 2016, our income tax receivables and deferred income tax balances for our TRS have been adjusted to include Plum Creek’s TRS, which include $4 million in federal income tax receivables and $59 million in deferred income tax assets arising from temporary differences between the tax bases and book bases of assets acquired and liabilities assumed in the merger. See Note 3: Merger with Plum Creek for additional details.

ONGOING IRS MATTER

As of March 31, 2016, Plum Creek's 2008 federal REIT income tax return is being audited by the Internal Revenue Service (“IRS”). The IRS has proposed an adjustment to Plum Creek REIT's U.S. federal income tax treatment of the Timberland Venture formation transaction, which occurred on October 1, 2008, on the basis that the transfer of the timberlands to Southern Diversified Timber, LLC, was a taxable transaction to the company at the time of the transfer rather than a nontaxable capital contribution to the Timberland Venture. The company has filed a protest with IRS Appeals. Based on recent discussions with IRS Appeals, we do not expect to reach a resolution and plan to file a petition in the U.S. Tax Court.

If the IRS's position is upheld on judicial appeal, it could result in a maximum built-in gains tax liability of approximately $100 million. In addition, we could be required to accelerate the distribution to shareholders of up to $600 million of gain from the transaction. We expect that as much as 80% of any such distribution could be made with our common stock, and shareholders would be subject to tax on the distribution at the applicable capital gains tax rate. We would also be required to pay interest on the undistributed gain, which would be substantial, and, if applicable, penalties.

We believe the transfer of the timberlands was a nontaxable contribution to the Timberland Venture and not a taxable transaction. We have not accrued income taxes for financial reporting purposes with respect to this matter. We are confident in our position and believe that the proposed re-characterization of the Timberland Venture formation transaction by the IRS will ultimately be unsuccessful. We intend to vigorously contest this re-characterization.

CONDENSED CONSOLIDATING FINANCIAL INFORMATION CONDENSED CONSOLIDATING FINANCIAL INFORMATION

3 Months Ended

Mar. 31, 2016

Condensed Consolidating Financial Information [Abstract]

Condensed Consolidating Financial Statements [Text Block]

CONDENSED CONSOLIDATING FINANCIAL INFORMATION

Plum Creek Timberlands, L.P. (PC Timberlands), a 100% owned subsidiary of Weyerhaeuser Company (WY), is the primary obligor of $894 million in debt securities that are registered under the U.S. Securities Act of 1933. Weyerhaeuser has guaranteed this debt, fully, unconditionally and irrevocably assuming and agreeing to perform, jointly and severally with PC Timberlands, the payment and covenant obligations for the debt.

The following condensed consolidating financial information provides information about: PC Timberlands, as issuer and primary obligor of the registered debt securities; Weyerhaeuser, as guarantor of the registered debt securities; and all other subsidiaries, as required by SEC Rule 3-10 of Regulation S-X (Rule 3-10). This condensed consolidating information was prepared in accordance with US GAAP, with the exception of investments in subsidiaries, which are accounted for using the equity method as required by Rule 3-10.

CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS



	QUARTER ENDED MARCH 31, 2016
DOLLAR AMOUNTS IN MILLIONS	Parent Company – WY			Subsidiary Issuer – PC Timberlands*			Non-Issuer and Non-Guarantor Subsidiaries			Eliminations			Total Company
Net sales	$	186		$	27		$	1,808		$	(186	)	$	1,835
Costs of products sold	57			24			1,577			(183		)	1,475
Gross margin	129			3			231			(3		)	360
Other operating expenses, net	81			22			71			—			174
Operating income	48			(19		)	160			(3		)	186
Non-operating expense, net	(12		)	(6		)	(67		)	—			(85		)
Earnings before income taxes	36			(25		)	93			(3		)	101
Income taxes	—			—			(20		)	—			(20		)
Net earnings	36			(25		)	73			(3		)	81
Dividends on preference shares	(11		)	—			—			—			(11		)
Net earnings attributable to Weyerhaeuser common shareholders	$	25		$	(25	)	$	73		$	(3	)	$	70



	QUARTER ENDED MARCH 31, 2015
DOLLAR AMOUNTS IN MILLIONS	Parent Company – WY			Subsidiary Issuer – PC Timberlands*		Non-Issuer and Non-Guarantor Subsidiaries			Eliminations			Total Company
Net sales	$	198		$	—	$	1,699		$	(170	)	$	1,727
Costs of products sold	61			—		1,495			(171		)	1,385
Gross margin	137			—		204			1			342
Other operating expenses, net	19			—		123			—			142
Operating income	118			—		81			1			200
Non-operating expense, net	(6		)	—		(74		)	—			(80		)
Earnings before income taxes	112			—		7			1			120
Income taxes	—			—		(19		)	—			(19		)
Net earnings	112			—		(12		)	1			101
Dividends on preference shares	(11		)	—		—			—			(11		)
Net earnings attributable to Weyerhaeuser common shareholders	$	101		$	—	$	(12	)	$	1		$	90

CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME (LOSS)



	QUARTER ENDED MARCH 31, 2016
DOLLAR AMOUNTS IN MILLIONS	Parent Company – WY		Subsidiary Issuer – PC Timberlands*			Non-Issuer and Non-Guarantor Subsidiaries			Eliminations			Total Company
Net earnings (loss)	$	36	$	(25	)	$	73		$	(3	)	$	81
Other comprehensive income:
Foreign currency translation adjustments	—		—			41			—			41
Actuarial gains, net of tax expense	2		—			8			—			10
Prior service costs, net of tax expense	—		—			(2		)	—			(2		)
Unrealized gains on available-for-sale securities	—		—			—			—			—
Total other comprehensive income	2		—			47			—			49
Comprehensive income (loss)	$	38	$	(25	)	$	120		$	(3	)	$	130



	QUARTER ENDED MARCH 31, 2015
DOLLAR AMOUNTS IN MILLIONS	Parent Company – WY		Subsidiary Issuer – PC Timberlands*		Non-Issuer and Non-Guarantor Subsidiaries			Eliminations		Total Company
Net earnings (loss)	$	112	$	—	$	(12	)	$	1	$	101
Other comprehensive income:
Foreign currency translation adjustments	—		—		(47		)	—		(47		)
Actuarial gains, net of tax expense	5		—		57			—		62
Prior service costs, net of tax expense	—		—		(2		)	—		(2		)
Unrealized gains on available-for-sale securities	—		—		1			—		1
Total other comprehensive income	5		—		9			—		14
Comprehensive income (loss)	$	117	$	—	$	(3	)	$	1	$	115

CONDENSED CONSOLIDATING BALANCE SHEET



	MARCH 31, 2016
DOLLAR AMOUNTS IN MILLIONS	Parent Company – WY		Subsidiary Issuer – PC Timberlands*		Non-Issuer and Non-Guarantor Subsidiaries		Eliminations			Total Company
Cash and cash equivalents	$	216	$	29	$	170	$	—		$	415
Other current assets	54		7		1,359		(5		)	1,415
Total current assets	270		36		1,529		(5		)	1,830
Property and equipment, net	165		66		2,532		—			2,763
Timber and timberlands at cost, net	3,485		5,713		5,373		(23		)	14,548
Investments in and advances to subsidiaries	10,896		4,535		781		(16,212		)	—
Other assets	88		143		3,042		(635		)	2,638
Total assets	$	14,904	$	10,493	$	13,257	$	(16,875	)	$	21,779

Total current liabilities	$	141	$	59	$	785	$	(1	)	$	984
Note payable to Timberland Venture	—		—		835		—			835
Long-term debt	2,743		1,829		3,831		(600		)	7,803
Other long-term liabilities	91		67		1,718		—			1,876
Total liabilities	2,975		1,955		7,169		(601		)	11,498
Equity:
Mandatory convertible preference shares	14		—		—		—			14
Common shares	948		—		—		—			948
Other equity	10,967		8,538		6,088		(16,274		)	9,319
Total equity	11,929		8,538		6,088		(16,274		)	10,281
Total liabilities and equity	$	14,904	$	10,493	$	13,257	$	(16,875	)	$	21,779



	DECEMBER 31, 2015
DOLLAR AMOUNTS IN MILLIONS	Parent Company – WY		Subsidiary Issuer – PC Timberlands*		Non-Issuer and Non-Guarantor Subsidiaries		Eliminations			Total Company
Cash and cash equivalents	$	673	$	—	$	339	$	—		$	1,012
Other current assets	7		—		1,161		(6		)	1,162
Total current assets	680		—		1,500		(6		)	2,174
Property and equipment, net	167		—		2,405		—			2,572
Timber and timberlands, net	3,538		—		2,965		(23		)	6,480
Investments in and advances to subsidiaries	2,948		—		—		(2,948		)	—
Other assets	88		—		1,791		(635		)	1,244
Total assets	$	7,421	$	—	$	8,661	$	(3,612	)	$	12,470

Total current liabilities	$	66	$	—	$	814	$	(5	)	$	875
Long-term debt	1,645		—		3,830		(600		)	4,875
Other long-term liabilities	91		—		1,760		—			1,851
Total liabilities	1,802		—		6,404		(605		)	7,601
Equity:
Mandatory convertible preference shares	14		—		—		—			14
Common shares	638		—		—		—			638
Other equity	4,967		—		2,257		(3,007		)	4,217
Total equity	5,619		—		2,257		(3,007		)	4,869
Total liabilities and equity	$	7,421	$	—	$	8,661	$	(3,612	)	$	12,470

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS



	QUARTER ENDED MARCH 31, 2016
DOLLAR AMOUNTS IN MILLIONS	Parent Company – WY			Subsidiary Issuer – PC Timberlands*		Non-Issuer and Non-Guarantor Subsidiaries			Eliminations			Total Company
Net cash from (used in) operations	$	29		$	25	$	(7	)	$	—		$	47
Net cash from (used in) investing activities:
Capital expenditures	(14		)	—		(59		)	—			(73		)
Acquisition of timberlands	—			—		(6		)	—			(6		)
Proceeds from sale of assets	—			—		70			—			70
Distributions from joint ventures	—			—		24			—			24
Cash acquired in merger with Plum Creek	—			4		5			—			9
Distribution from subsidiaries	196			—		—			(196		)	—
Net cash from investing activities	182			4		34			(196		)	24
Net cash from (used in) financing activities:
Net proceeds from issuance of debt	1,098			—		—			—			1,098
Payments on debt	(720		)	—		—			—			(720		)
Cash dividends on common shares	(241		)	—		—			—			(241		)
Repurchase of common stock	(798		)	—		—			—			(798		)
Distribution to parent	—			—		(196		)	196			—
Other	(7		)	—		—			—			(7		)
Net cash used in financing activities	$	(668	)	$	—	$	(196	)	$	196		$	(668	)



	QUARTER ENDED MARCH 31, 2015
DOLLAR AMOUNTS IN MILLIONS	Parent Company – WY			Subsidiary Issuer – PC Timberlands*		Non-Issuer and Non-Guarantor Subsidiaries			Eliminations			Total Company
Net cash from (used in) operations	$	(50	)	$	—	$	137		$	—		$	87
Net cash from (used in) investing activities:
Capital expenditures	(19		)	—		(70		)	—			(89		)
Acquisitions of timberlands	(26		)	—		(6		)	—			(32		)
Proceeds from sale of assets	—			—		2			—			2
Issuance of note to parent	—			—		(600		)	600			—
Distribution from subsidiaries	144			—		—			(144		)	—
Net cash from (used in) investing activities	99			—		(674		)	456			(119		)
Net cash from (used in) financing activities:
Proceeds from note from subsidiary	600			—		—			(600		)	—
Cash dividends on common shares	(152		)	—		—			—			(152		)
Repurchase of common stock	(253		)	—		—			—			(253		)
Distribution to parent	—			—		(144		)	144			—
Other	11			—		4			—			15
Net cash from (used in) financing activities	$	206		$	—	$	(140	)	$	(456	)	$	(390	)

* The Subsidiary Issuer – PC Timberlands – was acquired February 19, 2016, and there were no guarantees by Parent Company prior to that date. As such, information is included for this entity from the acquisition date.

BASIS OF PRESENTATION (Policies)

3 Months Ended

Mar. 31, 2016

Consolidation, Policy

Our consolidated financial statements provide an overall view of our results and financial condition. They include our accounts and the accounts of entities we control, including:


•	majority-owned domestic and foreign subsidiaries,


•	the results of Plum Creek Timber Company, Inc. (Plum Creek) for the period from February 19, 2016 (the merger date) to March 31, 2016 (see Note 3: Merger with Plum Creek), and


•	variable interest entities in which we are the primary beneficiary.

They do not include our intercompany transactions and accounts, which are eliminated.

Throughout these Notes to Consolidated Financial Statements, unless specified otherwise, references to “Weyerhaeuser,” “we,” "the company" and “our” refer to the consolidated company.

New Accounting Pronouncements, Policy

Earnings Per Share, Policy

Fair Value of Financial Instruments, Policy

To estimate the fair value of fixed rate long-term debt, we used the following valuation approaches:


•	market approach – based on quoted market prices we received for the same types and issues of our debt; or


•	income approach – based on the discounted value of the future cash flows using market yields for the same type and comparable issues of debt.

We believe that our variable rate long-term debt instruments have net carrying values that approximate their fair values with only insignificant differences.

The fair value of the Note Payable to Timberland Venture is estimated using a market approach based on quoted market prices we received for comparable issues of debt.

BUSINESS SEGMENTS (Tables)

3 Months Ended

Mar. 31, 2016

Reconciliation of Revenue from Segments to Consolidated

An analysis and reconciliation of our business segment information to the respective information in the Consolidated Statements of Operations is as follows:



	QUARTER ENDED
DOLLAR AMOUNTS IN MILLIONS	MARCH 2016			MARCH 2015
Sales to unaffiliated customers:
Timberlands	$	387		$	323
Real Estate & ENR	39			34
Wood Products	979			923
Cellulose Fibers	430			447
	1,835			1,727
Intersegment sales:
Timberlands	222			228
Wood Products	22			19
	244			247
Total sales	2,079			1,974
Intersegment eliminations	(244		)	(247		)
Total	$	1,835		$	1,727
Net contribution to earnings:
Timberlands	$	129		$	139
Real Estate & ENR⁽¹⁾	15			23
Wood Products	87			62
Cellulose Fibers⁽²⁾	28			33
	259			257
Unallocated items⁽³⁾	(61		)	(54		)
Net contribution to earnings	198			203
Interest expense, net of capitalized interest	(97		)	(83		)
Earnings before income taxes	101			120
Income taxes	(20		)	(19		)
Net earnings	81			101
Dividends on preference shares	(11		)	(11		)
Net earnings attributable to Weyerhaeuser common shareholders	$	70		$	90


(1)	The Real Estate & ENR segment includes the equity earnings from and investments in and advances to our Real Estate Development Ventures, which are accounted for under the equity method.


(2)	The Cellulose Fibers segment includes the equity earnings from and investments in and advances to our newsprint and publishing papers venture, which is accounted for under the equity method.

(3)

Reconciliation of Assets from Segment to Consolidated

A reconciliation of our business segment total assets to total assets in the Consolidated Balance Sheet is as follows:



DOLLAR AMOUNTS IN MILLIONS	MARCH 31, 2016		DECEMBER 31, 2015
Total Assets:
Timberlands and Real Estate & ENR⁽¹⁾	$	15,447	$	7,260
Wood Products	1,838		1,541
Cellulose Fibers	1,980		1,984
Unallocated items	2,514		1,685
Total	$	21,779	$	12,470


(1)	Assets attributable to the Real Estate & ENR business segment are combined with total assets for the Timberlands segment because we do not produce separate balance sheets internally.

MERGER WITH PLUM CREEK (Tables)

3 Months Ended

Mar. 31, 2016

Business Combinations [Abstract]

Schedule of Consideration Transferred [Table Text Block]

The following table summarizes the total consideration transferred in the merger:



DOLLAR AMOUNTS IN MILLIONS, EXCEPT PER-SHARE FIGURES
Number of Plum Creek common shares outstanding⁽¹⁾	174,307,267
Exchange ratio per the merger agreement	1.60
Weyerhaeuser shares issued in exchange for Plum Creek equity⁽²⁾	278,901,479
Price per Weyerhaeuser common share⁽³⁾	$	22.87
Aggregate value of Weyerhaeuser common stock issued			$	6,378
Fair value of stock options⁽⁴⁾			5
Estimated consideration transferred			$	6,383


(1)	The number of shares of Plum Creek common stock issued and outstanding as of February 19, 2016.


(2)	Total shares issued net of partial shares settled in cash.


(3)	The closing price of Weyerhaeuser common stock on the NYSE on February 19, 2016.


(4)	The estimated fair value of Plum Creek stock options for pre-merger services rendered.

Actual Impact of Acquisition [Table Text Block]

The amount of revenue and loss before income taxes from acquired Plum Creek operations included in our Consolidated Statement of Operations from the merger date to March 31, 2016 are as follows:



DOLLAR AMOUNTS IN MILLIONS	MARCH 2016
Net sales	$	126
Loss before income taxes	$	31

Business Acquisition, Pro Forma Information [Table Text Block]

Summarized unaudited pro forma information that presents combined amounts as if this merger occurred at the beginning of 2015 is as follows:



	QUARTER ENDED
DOLLAR AMOUNTS IN MILLIONS, EXCEPT PER-SHARE FIGURES	MARCH 2016		MARCH 2015
Net sales	$	1,991	$	2,125
Net earnings attributable to Weyerhaeuser common shareholders	$	164	$	103
Basic earnings per share attributable to Weyerhaeuser common shareholders	$	0.21	$	0.13
Diluted earnings per share attributable to Weyerhaeuser common shareholders	$	0.21	$	0.13

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]

Preliminary estimated fair values of identifiable assets acquired and liabilities assumed as of the acquisition date are as follows:



DOLLAR AMOUNTS IN MILLIONS	FEBRUARY 19, 2016
Current assets	$	128
Timber and timberlands	8,124
Minerals and mineral rights	312
Property and equipment	272
Equity investment in Timberland Venture	876
Equity investment in Real Estate Development Ventures	88
Other assets	163
Total assets acquired	$	9,963

Current liabilities	$	610
Long-term debt	2,056
Note Payable to Timberland Venture	837
Other liabilities	77
Total liabilities assumed	$	3,580

Net assets acquired	$	6,383

NET EARNINGS PER SHARE (Tables)

3 Months Ended

Mar. 31, 2016

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]



	QUARTER ENDED
SHARES IN THOUSANDS	MARCH 2016	MARCH 2015
Weighted average number of outstanding common shares – basic	632,004	523,426
Dilutive potential common shares:
Stock options	2,060	2,962
Restricted stock units	409	415
Performance share units	399	620
Preference shares	—	—
Total effect of outstanding dilutive potential common shares	2,868	3,997
Weighted average number of outstanding common shares – dilutive	634,872	527,423

Potential Shares Not Included in the Computation of Diluted Earnings per Share



	QUARTER ENDED
SHARES IN THOUSANDS	MARCH 2016	MARCH 2015
Stock options	6,215	1,128
Performance share units	534	358
Preference shares	25,307	24,988

INVENTORIES (Tables)

3 Months Ended

Mar. 31, 2016

Inventories

Inventories include raw materials, work-in-process and finished goods.



DOLLAR AMOUNTS IN MILLIONS	MARCH 31, 2016		DECEMBER 31, 2015
LIFO Inventories:
Logs and chips	$	28	$	15
Lumber, plywood and panels	57		48
Pulp and paperboard	109		111
Other products	13		11
FIFO or moving average cost inventories:
Logs and chips	71		38
Lumber, plywood, panels and engineered wood products	94		75
Pulp and paperboard	37		32
Other products	100		90
Materials and supplies	168		148
Total	$	677	$	568

EQUITY METHOD INVESTMENTS (Tables)

3 Months Ended

Mar. 31, 2016

Equity Method Investments and Joint Ventures [Abstract]

Equity Method Investments [Table Text Block]

The following tables summarize the current period equity earnings or loss from and our respective balances of our investments in and advances to each of our joint ventures:



	QUARTER ENDED
DOLLAR AMOUNTS IN MILLIONS	MARCH 2016			MARCH 2015
Equity earnings (loss) from joint ventures:
Newsprint and publishing papers venture	$	(2	)	$	(6	)
Timberland Venture	5			—
Real Estate Development Ventures	—			—
Total	$	3		$	(6	)

	MARCH 31, 2016			DECEMBER 31, 2015
Investment in and advances to joint ventures:
Newsprint and publishing papers venture	$	72		$	74
Timberland Venture	852			—
Real Estate Development Ventures	87			—
Total	$	1,011		$	74

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Tables)

3 Months Ended

Mar. 31, 2016

Components of Net Periodic Benefit Costs (Credits)

The components of net periodic benefit costs (credits) are:



	PENSION
	QUARTER ENDED
DOLLAR AMOUNTS IN MILLIONS	MARCH 2016			MARCH 2015
Service cost	$	13		$	15
Interest cost	68			65
Expected return on plan assets	(123		)	(118		)
Amortization of actuarial loss	38			44
Amortization of prior service cost	1			1
Accelerated pension costs included in Plum Creek merger-related costs (Note 15)	5			—
Total net periodic benefit cost (credit)	$	2		$	7



	OTHER POSTRETIREMENT BENEFITS
	QUARTER ENDED
DOLLAR AMOUNTS IN MILLIONS	MARCH 2016			MARCH 2015
Interest cost	$	2		$	3
Amortization of actuarial loss	2			2
Amortization of prior service credit	(2		)	(2		)
Total net periodic benefit cost	$	2		$	3

ACCRUED LIABILITIES (Tables)

3 Months Ended

Mar. 31, 2016

Accrued Liabilities

Accrued liabilities were comprised of the following:



DOLLAR AMOUNTS IN MILLIONS	MARCH 31, 2016		DECEMBER 31, 2015
Wages, salaries and severance pay	$	150	$	150
Pension and other postretirement benefits	79		44
Vacation pay	52		46
Taxes – Social Security and real and personal property	36		24
Interest	100		104
Customer rebates and volume discounts	34		46
Deferred income	37		52
Other	107		79
Total	$	595	$	545

FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)

3 Months Ended

Mar. 31, 2016

Estimated Fair Values and Carrying Values of Long-Term Debt

The estimated fair values and carrying values of our long-term debt consisted of the following:



	MARCH 31, 2016				DECEMBER 31, 2015
DOLLAR AMOUNTS IN MILLIONS	CARRYING VALUE		FAIR VALUE (LEVEL 2)		CARRYING VALUE		FAIR VALUE (LEVEL 2)
Long-term Debt – fixed rate	$	6,156	$	6,993	$	4,326	$	5,070
Long-term Debt – variable rate	1,647		1,650		549		550
Note Payable to Timberland Venture	835		843		—		—
Total Debt	$	8,638	$	9,486	$	4,875	$	5,620

CUMULATIVE OTHER COMPREHENSIVE INCOME (LOSS) (Tables)

3 Months Ended

Mar. 31, 2016

Changes in amounts included in our cumulative other comprehensive income (loss) by component

Changes in amounts included in our cumulative other comprehensive income (loss) by component are:



			PENSION						OTHER POSTRETIREMENT BENEFITS
DOLLAR AMOUNTS IN MILLIONS	Foreign currency translation adjustments		Actuarial losses			Prior service costs			Actuarial losses			Prior service credits			Unrealized gains on available-for-sale securities		Total
Beginning balance as of December 31, 2015	$	207	$	(1,372	)	$	(11	)	$	(77	)	$	35		$	6	$	(1,212	)
Other comprehensive income (loss) before reclassifications	41		(22		)	—			—			—			—		19
Income taxes	—		6			—			—			—			—		6
Net other comprehensive income (loss) before reclassifications	41		(16		)	—			—			—			—		25
Amounts reclassified from cumulative other comprehensive income (loss)⁽¹⁾	—		38			1			2			(2		)	—		39
Income taxes	—		(13		)	(1		)	(1		)	—			—		(15		)
Net amounts reclassified from cumulative other comprehensive income (loss)	—		25			—			1			(2		)	—		24
Total other comprehensive income (loss)	41		9			—			1			(2		)	—		49
Ending balance as of March 31, 2016	$	248	$	(1,363	)	$	(11	)	$	(76	)	$	33		$	6	$	(1,163	)
(1) Actuarial losses and prior service credits (cost) are included in the computation of net periodic benefit costs (credits). See Note 7: Pension and Other Postretirement Benefit Plans.

SHARE-BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 2016

Weighted Average Assumptions Used in Estimating the Value of Stock Options Granted

Weighted Average Assumptions Used in Estimating the Value of Stock Options Granted in 2016



	Stock Options⁽¹⁾
Expected volatility	25.43		%
Expected dividends	5.37		%
Expected term (in years)	4.95
Risk-free rate	1.28		%
Weighted average grant date fair value		$2.73


(1)	Weighted average assumptions presented do not include the replacement stock options awards issued as consideration for our merger with Plum Creek.

Weighted Average Assumptions Used in Estimating the Value of Performance Share Units Granted

Weighted Average Assumptions Used in Estimating the Value of Performance Share Units Granted in 2016



	Performance Share Units
Performance period	1/1/2016 – 12/31/2018
Valuation date closing stock price	$	23.09
Expected dividends	5.37					%
Risk-free rate	0.48		%	–	0.93	%
Expected volatility	23.57		%	–	28.09	%

Weighted Average Assumptions Used to Remeasure the Value of Stock Appreciation Rights

Weighted Average Assumptions Used to Remeasure the Value of Stock Appreciation Rights as of March 31, 2016



	Stock Appreciation Rights
Expected volatility	25.15		%
Expected dividends	4.12		%
Expected term (in years)	2.55
Risk-free rate	0.98		%
Weighted average fair value		$7.52

CHARGES FOR INTEGRATION AND RESTRUCTURING, CLOSURES AND ASSET IMPAIRMENTS (Tables)

3 Months Ended

Mar. 31, 2016

Restructuring Cost and Reserve [Line Items]

Items Included in Our Restructuring, Closure and Asset Impairment Charges



	QUARTER ENDED
DOLLAR AMOUNTS IN MILLIONS	MARCH 2016		MARCH 2015
Integration and restructuring charges related to our merger with Plum Creek:
Termination benefits	$	45	$	—
Acceleration of share-based compensation related to qualifying terminations (Note 14)	19		—
Acceleration of pension benefits related to qualifying terminations (Note 7)	5		—
Professional services	39		—
Other integration and restructuring costs	2		—
Total integration and restructuring charges related to our merger with Plum Creek	110		—
Charges related to closures and other restructuring activities	7		1
Impairments of long-lived assets	—		13
Total charges for integration and restructuring, closures and impairments	$	117	$	14

Changes in accrued severance related to restructuring

Changes in accrued severance related to restructuring during the quarter ended March 31, 2016 were as follows:



DOLLAR AMOUNTS IN MILLIONS
Accrued severance as of December 31, 2015	$	5
Charges	45
Payments	(17		)
Accrued severance as of March 31, 2016	$	33

OTHER OPERATING COSTS (INCOME), NET (Tables)

3 Months Ended

Mar. 31, 2016

Items Included in Other Operating Costs (Income), Net



	QUARTER ENDED
DOLLAR AMOUNTS IN MILLIONS	MARCH 2016			MARCH 2015
Gain on disposition of nonstrategic assets	(36		)	(2		)
Foreign exchange losses (gains), net	(13		)	29
Litigation expense, net	3			5
Other, net	(15		)	(11		)
Total other operating costs (income), net	$	(61	)	$	21

CONDENSED CONSOLIDATING FINANCIAL INFORMATION (Tables)

3 Months Ended

Mar. 31, 2016

Condensed Income Statement [Table Text Block]

CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS



	QUARTER ENDED MARCH 31, 2016
DOLLAR AMOUNTS IN MILLIONS	Parent Company – WY			Subsidiary Issuer – PC Timberlands*			Non-Issuer and Non-Guarantor Subsidiaries			Eliminations			Total Company
Net sales	$	186		$	27		$	1,808		$	(186	)	$	1,835
Costs of products sold	57			24			1,577			(183		)	1,475
Gross margin	129			3			231			(3		)	360
Other operating expenses, net	81			22			71			—			174
Operating income	48			(19		)	160			(3		)	186
Non-operating expense, net	(12		)	(6		)	(67		)	—			(85		)
Earnings before income taxes	36			(25		)	93			(3		)	101
Income taxes	—			—			(20		)	—			(20		)
Net earnings	36			(25		)	73			(3		)	81
Dividends on preference shares	(11		)	—			—			—			(11		)
Net earnings attributable to Weyerhaeuser common shareholders	$	25		$	(25	)	$	73		$	(3	)	$	70



	QUARTER ENDED MARCH 31, 2015
DOLLAR AMOUNTS IN MILLIONS	Parent Company – WY			Subsidiary Issuer – PC Timberlands*		Non-Issuer and Non-Guarantor Subsidiaries			Eliminations			Total Company
Net sales	$	198		$	—	$	1,699		$	(170	)	$	1,727
Costs of products sold	61			—		1,495			(171		)	1,385
Gross margin	137			—		204			1			342
Other operating expenses, net	19			—		123			—			142
Operating income	118			—		81			1			200
Non-operating expense, net	(6		)	—		(74		)	—			(80		)
Earnings before income taxes	112			—		7			1			120
Income taxes	—			—		(19		)	—			(19		)
Net earnings	112			—		(12		)	1			101
Dividends on preference shares	(11		)	—		—			—			(11		)
Net earnings attributable to Weyerhaeuser common shareholders	$	101		$	—	$	(12	)	$	1		$	90

Condensed Statement of Comprehensive Income [Table Text Block]

CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME (LOSS)



	QUARTER ENDED MARCH 31, 2016
DOLLAR AMOUNTS IN MILLIONS	Parent Company – WY		Subsidiary Issuer – PC Timberlands*			Non-Issuer and Non-Guarantor Subsidiaries			Eliminations			Total Company
Net earnings (loss)	$	36	$	(25	)	$	73		$	(3	)	$	81
Other comprehensive income:
Foreign currency translation adjustments	—		—			41			—			41
Actuarial gains, net of tax expense	2		—			8			—			10
Prior service costs, net of tax expense	—		—			(2		)	—			(2		)
Unrealized gains on available-for-sale securities	—		—			—			—			—
Total other comprehensive income	2		—			47			—			49
Comprehensive income (loss)	$	38	$	(25	)	$	120		$	(3	)	$	130



	QUARTER ENDED MARCH 31, 2015
DOLLAR AMOUNTS IN MILLIONS	Parent Company – WY		Subsidiary Issuer – PC Timberlands*		Non-Issuer and Non-Guarantor Subsidiaries			Eliminations		Total Company
Net earnings (loss)	$	112	$	—	$	(12	)	$	1	$	101
Other comprehensive income:
Foreign currency translation adjustments	—		—		(47		)	—		(47		)
Actuarial gains, net of tax expense	5		—		57			—		62
Prior service costs, net of tax expense	—		—		(2		)	—		(2		)
Unrealized gains on available-for-sale securities	—		—		1			—		1
Total other comprehensive income	5		—		9			—		14
Comprehensive income (loss)	$	117	$	—	$	(3	)	$	1	$	115

Condensed Balance Sheet [Table Text Block]

CONDENSED CONSOLIDATING BALANCE SHEET



	MARCH 31, 2016
DOLLAR AMOUNTS IN MILLIONS	Parent Company – WY		Subsidiary Issuer – PC Timberlands*		Non-Issuer and Non-Guarantor Subsidiaries		Eliminations			Total Company
Cash and cash equivalents	$	216	$	29	$	170	$	—		$	415
Other current assets	54		7		1,359		(5		)	1,415
Total current assets	270		36		1,529		(5		)	1,830
Property and equipment, net	165		66		2,532		—			2,763
Timber and timberlands at cost, net	3,485		5,713		5,373		(23		)	14,548
Investments in and advances to subsidiaries	10,896		4,535		781		(16,212		)	—
Other assets	88		143		3,042		(635		)	2,638
Total assets	$	14,904	$	10,493	$	13,257	$	(16,875	)	$	21,779

Total current liabilities	$	141	$	59	$	785	$	(1	)	$	984
Note payable to Timberland Venture	—		—		835		—			835
Long-term debt	2,743		1,829		3,831		(600		)	7,803
Other long-term liabilities	91		67		1,718		—			1,876
Total liabilities	2,975		1,955		7,169		(601		)	11,498
Equity:
Mandatory convertible preference shares	14		—		—		—			14
Common shares	948		—		—		—			948
Other equity	10,967		8,538		6,088		(16,274		)	9,319
Total equity	11,929		8,538		6,088		(16,274		)	10,281
Total liabilities and equity	$	14,904	$	10,493	$	13,257	$	(16,875	)	$	21,779



	DECEMBER 31, 2015
DOLLAR AMOUNTS IN MILLIONS	Parent Company – WY		Subsidiary Issuer – PC Timberlands*		Non-Issuer and Non-Guarantor Subsidiaries		Eliminations			Total Company
Cash and cash equivalents	$	673	$	—	$	339	$	—		$	1,012
Other current assets	7		—		1,161		(6		)	1,162
Total current assets	680		—		1,500		(6		)	2,174
Property and equipment, net	167		—		2,405		—			2,572
Timber and timberlands, net	3,538		—		2,965		(23		)	6,480
Investments in and advances to subsidiaries	2,948		—		—		(2,948		)	—
Other assets	88		—		1,791		(635		)	1,244
Total assets	$	7,421	$	—	$	8,661	$	(3,612	)	$	12,470

Total current liabilities	$	66	$	—	$	814	$	(5	)	$	875
Long-term debt	1,645		—		3,830		(600		)	4,875
Other long-term liabilities	91		—		1,760		—			1,851
Total liabilities	1,802		—		6,404		(605		)	7,601
Equity:
Mandatory convertible preference shares	14		—		—		—			14
Common shares	638		—		—		—			638
Other equity	4,967		—		2,257		(3,007		)	4,217
Total equity	5,619		—		2,257		(3,007		)	4,869
Total liabilities and equity	$	7,421	$	—	$	8,661	$	(3,612	)	$	12,470

Condensed Cash Flow Statement [Table Text Block]

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS



	QUARTER ENDED MARCH 31, 2016
DOLLAR AMOUNTS IN MILLIONS	Parent Company – WY			Subsidiary Issuer – PC Timberlands*		Non-Issuer and Non-Guarantor Subsidiaries			Eliminations			Total Company
Net cash from (used in) operations	$	29		$	25	$	(7	)	$	—		$	47
Net cash from (used in) investing activities:
Capital expenditures	(14		)	—		(59		)	—			(73		)
Acquisition of timberlands	—			—		(6		)	—			(6		)
Proceeds from sale of assets	—			—		70			—			70
Distributions from joint ventures	—			—		24			—			24
Cash acquired in merger with Plum Creek	—			4		5			—			9
Distribution from subsidiaries	196			—		—			(196		)	—
Net cash from investing activities	182			4		34			(196		)	24
Net cash from (used in) financing activities:
Net proceeds from issuance of debt	1,098			—		—			—			1,098
Payments on debt	(720		)	—		—			—			(720		)
Cash dividends on common shares	(241		)	—		—			—			(241		)
Repurchase of common stock	(798		)	—		—			—			(798		)
Distribution to parent	—			—		(196		)	196			—
Other	(7		)	—		—			—			(7		)
Net cash used in financing activities	$	(668	)	$	—	$	(196	)	$	196		$	(668	)



	QUARTER ENDED MARCH 31, 2015
DOLLAR AMOUNTS IN MILLIONS	Parent Company – WY			Subsidiary Issuer – PC Timberlands*		Non-Issuer and Non-Guarantor Subsidiaries			Eliminations			Total Company
Net cash from (used in) operations	$	(50	)	$	—	$	137		$	—		$	87
Net cash from (used in) investing activities:
Capital expenditures	(19		)	—		(70		)	—			(89		)
Acquisitions of timberlands	(26		)	—		(6		)	—			(32		)
Proceeds from sale of assets	—			—		2			—			2
Issuance of note to parent	—			—		(600		)	600			—
Distribution from subsidiaries	144			—		—			(144		)	—
Net cash from (used in) investing activities	99			—		(674		)	456			(119		)
Net cash from (used in) financing activities:
Proceeds from note from subsidiary	600			—		—			(600		)	—
Cash dividends on common shares	(152		)	—		—			—			(152		)
Repurchase of common stock	(253		)	—		—			—			(253		)
Distribution to parent	—			—		(144		)	144			—
Other	11			—		4			—			15
Net cash from (used in) financing activities	$	206		$	—	$	(140	)	$	(456	)	$	(390	)

BASIS OF PRESENTATION Additional Information (Details) $ in Millions	3 Months Ended
	Mar. 31, 2015 USD ($)
Accounting Policies [Abstract]
Shares withheld by employer for tax-withholding purposes	$ 10

BUSINESS SEGMENTS - Reconciliation from Segment Totals to Consolidated (Detail) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales		$ 1,835	$ 1,727
Net contribution to earnings		198	203
Interest expense, net of capitalized interest		(97)	(83)
Earnings before income taxes		101	120
Income taxes		(20)	(19)
Net earnings		81	101
Dividends on preference shares		(11)	(11)
Net earnings attributable to Weyerhaeuser common shareholders		70	90
Continuing operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales		1,835	1,727
Operating segments \| Continuing operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales		2,079	1,974
Net contribution to earnings		259	257
Operating segments \| Timberlands \| Continuing operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales		387	323
Net contribution to earnings		129	139
Operating segments \| RE & ENR \| Continuing operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales		39	34
Net contribution to earnings		15	23
Operating segments \| Wood Products \| Continuing operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales		979	923
Net contribution to earnings		87	62
Operating segments \| Cellulose Fibers \| Continuing operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales		430	447
Net contribution to earnings		28	33
Operating intersegments \| Continuing operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales		244	247
Operating intersegments \| Timberlands \| Continuing operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales		222	228
Operating intersegments \| Wood Products \| Continuing operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales		22	19
Intersegment eliminations \| Continuing operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales		(244)	(247)
Unallocated Items \| Continuing operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net contribution to earnings		$ (61)	$ (54)
Subsequent Event \| Cellulose Fibers
Segment Reporting, Revenue Reconciling Item [Line Items]
Proceeds from Sale of Property Held-for-sale	$ 2,200

BUSINESS SEGMENTS -Reconciliation of Assets from Segments to Consolidated (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Segment Reporting, Asset Reconciling Item [Line Items]
Assets		$ 12,470
Continuing operations
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 21,779	12,470
Continuing operations \| Operating segments \| Timberlands and Real Estate & ENR
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	15,447	7,260
Continuing operations \| Operating segments \| Wood Products
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	1,838	1,541
Continuing operations \| Operating segments \| Cellulose Fibers
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	1,980	1,984
Continuing operations \| Unallocated Items
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 2,514	$ 1,685

MERGER WITH PLUM CREEK Consideration Transferred (Details) - Plum Creek [Member] $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($) shares	Feb. 19, 2016 USD ($) $ / shares shares
Business Acquisition [Line Items]
Number of Plum Creek common shares outstanding(1) \| shares		174,307,267
Exchange ratio per the merger agreement		1.60
Weyerhaeuser shares issued in exchange for Plum Creek equity(2) \| shares	278,901,479
Price per Weyerhaeuser common share(3) \| $ / shares		$ 22.87
Aggregate value of Weyerhaeuser common stock issued		$ 6,378
Fair value of stock options(4)		5
Estimated consideration transferred	$ 6,383
Stock options
Business Acquisition [Line Items]
Fair value of stock options(4)		$ 5

MERGER WITH PLUM CREEK Actual Impact of Acquisition (Details) - Plum Creek [Member] $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($)
Business Acquisition [Line Items]
Net sales	$ 126
Loss before income taxes	$ 31

MERGER WITH PLUM CREEK Unaudited ProForma Information (Details) - Plum Creek [Member] - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Business Acquisition [Line Items]
Net sales	$ 1,991	$ 2,125
Net earnings attributable to Weyerhaeuser common shareholders	$ 164	$ 103
Basic earnings per share attributable to Weyerhaeuser common shareholders	$ 0.21	$ 0.13
Diluted earnings per share attributable to Weyerhaeuser common shareholders	$ 0.21	$ 0.13

MERGER WITH PLUM CREEK Recognized Identified Assets Acquired and Liabilities Assumed (Details) - Plum Creek [Member] $ in Millions	Feb. 19, 2016 USD ($)
Business Acquisition [Line Items]
Current assets	$ 128
Timber and timberlands	8,124
Minerals and mineral rights	312
Property and equipment	272
Other assets	163
Total assets acquired	9,963
Current liabilities	610
Long-term debt	2,056
Note Payable to Timberland Venture	837
Other liabilities	77
Total liabilities assumed	3,580
Net assets acquired	6,383
Timberland Venture [Member]
Business Acquisition [Line Items]
Equity Investments in Joint Ventures	876
Real Estate Development Ventures [Member]
Business Acquisition [Line Items]
Equity Investments in Joint Ventures	$ 88

MERGER WITH PLUM CREEK Additional Information (Details) - Plum Creek [Member] $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)	Feb. 19, 2016
Business Acquisition [Line Items]
Exchange ratio per the merger agreement				1.60
Merger-related costs	$ 110	$ 0	$ 14
Non-recurring merger-related costs	$ 131	$ 0

NET EARNINGS PER SHARE Dilutive Potential Common Shares (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Basic	632,004	523,426
Dilutive potential common shares	2,868	3,997
Diluted	634,872	527,423
Stock options
Dilutive potential common shares	2,060	2,962
Restricted stock units
Dilutive potential common shares	409	415
Performance share units
Dilutive potential common shares	399	620
Preference shares
Dilutive potential common shares	0	0

NET EARNINGS PER SHARE - Potential Shares Not Included in the Computation of Diluted Earnings Per Share (Detail) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential shares not included in the computation of diluted earnings per share	6,215	1,128
Performance share units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential shares not included in the computation of diluted earnings per share	534	358
Preference shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential shares not included in the computation of diluted earnings per share	25,307	24,988

NET EARNINGS PER SHARE - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended
	Apr. 30, 2016	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Basic and diluted earnings per share attributable to Weyerhaeuser common shareholders		$ 0.11	$ 0.17
Stock repurchase program, shares repurchased		31,367,541
Stock repurchase program, shares repurchased value		$ 863
Stock repurchase program, authorized repurchase amount				$ 2,500
Stock repurchase program, remaining authorized repurchase amount		$ 1,638
Unsettled Share Repurchases [Member]
Stock repurchase program, shares repurchased		2,128,645
Stock repurchase program, shares repurchased value		$ 66
Subsequent Event
Stock repurchase program, shares repurchased	12,288,096
Stock repurchase program, shares repurchased value	$ 387
Stock repurchase program, remaining authorized repurchase amount	$ 1,251

INVENTORIES - Inventories (Detail) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Inventory [Line Items]
Total	$ 677	$ 568
Logs and chips
Inventory [Line Items]
LIFO inventories	28	15
FIFO or moving average cost inventories	71	38
Lumber, plywood and panels
Inventory [Line Items]
LIFO inventories	57	48
Lumber, plywood, panels and engineered wood products
Inventory [Line Items]
FIFO or moving average cost inventories	94	75
Pulp and paperboard
Inventory [Line Items]
LIFO inventories	109	111
FIFO or moving average cost inventories	37	32
Other products
Inventory [Line Items]
LIFO inventories	13	11
FIFO or moving average cost inventories	100	90
Materials and supplies
Inventory [Line Items]
FIFO or moving average cost inventories	$ 168	$ 148

INVENTORIES - Additional information (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Inventory [Line Items]
Increase in inventory amount if FIFO would have been used	$ 123	$ 124

EQUITY METHOD INVESTMENTS Equity Method Investments and Joint Ventures (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Equity earnings (loss) from joint ventures (Note 6)	$ 3	$ (6)
Investments in and advances to joint ventures	1,011		$ 74
Newsprint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Equity earnings (loss) from joint ventures (Note 6)	(2)	(6)
Investments in and advances to joint ventures	72		74
Timberland Venture [Member]
Schedule of Equity Method Investments [Line Items]
Equity earnings (loss) from joint ventures (Note 6)	5	0
Investments in and advances to joint ventures	852		0
Real Estate Development Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Equity earnings (loss) from joint ventures (Note 6)	0	$ 0
Investments in and advances to joint ventures	$ 87		$ 0

EQUITY METHOD INVESTMENTS Additional Information (Details) $ in Millions	1 Months Ended	3 Months Ended
	Apr. 30, 2016 USD ($)	Mar. 31, 2016 a	Apr. 01, 2016 a
Class A Properties [Member] \| Real Estate Development Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Land Designated with Development Potential (Acres)		21,000
Equity Method Investment, Ownership Percentage		3.00%
Other Partner Ownership Percentage		97.00%
Class B Properties [Member] \| Real Estate Development Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Land Designated with Development Potential (Acres)		51,000
Equity Method Investment, Ownership Percentage		50.00%
Other Partner Ownership Percentage		50.00%
Preferred Stock [Member] \| Timberland Venture (Preferred Interest) [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage		100.00%
Cumulative preferred return		7.875%
Common Stock [Member] \| Timberland Venture (Preferred Interest) [Member]
Schedule of Equity Method Investments [Line Items]
Other Partner Ownership Percentage		91.00%
Ownership percentage		9.00%
Subsequent Event \| Twin Creeks Venture [Member]
Schedule of Equity Method Investments [Line Items]
Other Partner Ownership Percentage			79.00%
Ownership percentage	21.00%
Proceeds from Partnership Contribution \| $	$ 440
Contributed Acres of Timberlands to Venture			260,000

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Components of Net Periodic Benefit Costs (Credits) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 13	$ 15
Interest cost	68	65
Expected return on plan assets	(123)	(118)
Amortization of actuarial loss	38	44
Amortization of prior service cost (credit)	1	1
Accelerated pension costs included in Plum Creek merger-related costs	5	0
Total net periodic benefit cost (credit)	2	7
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	2	3
Amortization of actuarial loss	2	2
Amortization of prior service cost (credit)	(2)	(2)
Total net periodic benefit cost (credit)	2	3
Plum Creek [Member]
Defined Benefit Plan Disclosure [Line Items]
Accelerated pension costs included in Plum Creek merger-related costs	$ 5	$ 0

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Feb. 19, 2016
Registered Canadian Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to benefit plans during 2016	$ 16
Non Registered Canadian Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to benefit plans during 2016	3
Pension
Defined Benefit Plan Disclosure [Line Items]
Accelerated pension costs included in Plum Creek merger-related costs	5	$ 0
U.S. Non-Qualified Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to benefit plans during 2016	52
U.S. and Canadian Other Postretirement Plans
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to benefit plans during 2016	22
U.S. Qualified Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to benefit plans during 2016	0
Plum Creek [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Funded Status of Plan	(62)
Accelerated pension costs included in Plum Creek merger-related costs	5	$ 0
Plum Creek [Member] \| U.S. Non-Qualified Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets held in grantor trust	47
Defined Benefit Plan, Benefit Obligation			$ 50
Expected contribution to benefit plans during 2016	$ 33
Plum Creek [Member] \| U.S. Qualified Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets	7.00%
Defined Benefit Plan, Fair Value of Plan Assets			137
Defined Benefit Plan, Benefit Obligation			$ 149

VARIABLE INTEREST ENTITIES Variable Interest Entities (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($)
Real Estate Development Ventures [Member]
Variable Interest Entity [Line Items]
Capital contributions outstanding	$ 29
Maximum exposure to loss	87
Timberland Venture [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	$ 852
Common Stock [Member] \| Timberland Venture [Member]
Variable Interest Entity [Line Items]
Ownership percentage	9.00%

ACCRUED LIABILITIES - Accrued Liabilities (Detail) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Wages, salaries and severance pay	$ 150	$ 150
Pension and other postretirement benefits	79	44
Vacation pay	52	46
Taxes – Social Security and real and personal property	36	24
Interest	100	104
Customer rebates and volume discounts	34	46
Deferred income	37	52
Other	107	79
Total	$ 595	$ 545

- Definition

The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.

+ References + Details

LONG-TERM DEBT AND LINES OF CREDIT (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Feb. 19, 2016	Dec. 31, 2015
Repayments of Long-term Debt	$ 720	$ 0
Plum Creek [Member]
Repayments of Long-term Debt	720
Senior Note due 2021 [Member]
Long-term Debt	$ 569
Interest Rate, Stated Percentage	4.70%
Senior Note due 2021 [Member] \| Plum Creek [Member]
Long-term Debt, Fair Value			$ 614
Senior Note due 2023 [Member]
Long-term Debt	$ 325
Interest Rate, Stated Percentage	3.25%
Senior Note due 2023 [Member] \| Plum Creek [Member]
Long-term Debt, Fair Value			324
Installment Note Payable [Member]
Long-term Debt	$ 860
Interest Rate, Stated Percentage	5.207%
Installment Note Payable [Member] \| Plum Creek [Member]
Long-term Debt, Fair Value			892
Note Payable to Timberland Venture [Member]
Principal due to Timberland Venture	$ 783
Note payable to Timberland Venture (Note 10)			$ 837
Annual interest rate on note payable	7.375%
Term Loan due August 2017 [Member]
Term Loan, Maximum Borrowing Capacity	$ 600
Interest Rate Terms	LIBOR plus 1.05%
Term Loan, Outstanding	$ 600
Term Loan due September 2017 [Member]
Term Loan, Maximum Borrowing Capacity	$ 1,900
Interest Rate Terms	LIBOR plus 1.05%
Term Loan, Outstanding	$ 500
Fair Value, Inputs, Level 2 [Member] \| Note Payable to Timberland Venture [Member]
Note payable to Timberland Venture (Note 10)	$ 843			$ 0

FAIR VALUE OF FINANCIAL INSTRUMENTS - Estimated Fair Values and Carrying Values of Long-Term Debt (Detail) - USD ($) $ in Millions	Mar. 31, 2016	Feb. 19, 2016	Dec. 31, 2015
FAIR VALUE OF FINANCIAL INSTRUMENTS [Line Items]
Long-term Debt, Excluding Current Maturities	$ 7,803		$ 4,875
Note payable to Timberland Venture (Note 10)	835		0
Total Debt	8,638		4,875
Fair Value, Inputs, Level 2
FAIR VALUE OF FINANCIAL INSTRUMENTS [Line Items]
Total Debt	9,486		5,620
Note Payable to Timberland Venture [Member]
FAIR VALUE OF FINANCIAL INSTRUMENTS [Line Items]
Note payable to Timberland Venture (Note 10)			0
Note Payable to Timberland Venture, Fair Value Disclosure		$ 837
Note Payable to Timberland Venture [Member] \| Fair Value, Inputs, Level 2
FAIR VALUE OF FINANCIAL INSTRUMENTS [Line Items]
Note Payable to Timberland Venture, Fair Value Disclosure	843		0
Fixed interest rate [Member]
FAIR VALUE OF FINANCIAL INSTRUMENTS [Line Items]
Long-term Debt, Excluding Current Maturities	6,156		4,326
Fixed interest rate [Member] \| Fair Value, Inputs, Level 2
FAIR VALUE OF FINANCIAL INSTRUMENTS [Line Items]
Long-term Debt, Fair Value	6,993		5,070
Variable interest rate [Member]
FAIR VALUE OF FINANCIAL INSTRUMENTS [Line Items]
Long-term Debt, Excluding Current Maturities	1,647		549
Variable interest rate [Member] \| Fair Value, Inputs, Level 2
FAIR VALUE OF FINANCIAL INSTRUMENTS [Line Items]
Long-term Debt, Fair Value	$ 1,650		$ 550

LEGAL PROCEEDINGS, COMMITMENTS AND CONTINGENCIES (Detail) $ in Millions	Mar. 31, 2016 USD ($)
Commitments and Contingencies Disclosure [Line Items]
Accrued estimated remediation costs	$ 37
Asset retirement obligations	$ 38

CUMULATIVE OTHER COMPREHENSIVE INCOME (LOSS) - Items Included in Cumulative Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Beginning balance	$ (1,212)
Other comprehensive income (loss) before reclassifications	19
Income taxes	6
Net other comprehensive income (loss) before reclassifications	25
Amounts reclassified from cumulative other comprehensive income (loss)(1)	39
Income taxes	(15)
Net amounts reclassified from cumulative other comprehensive income (loss)	24
Total other comprehensive income	49	$ 14
Ending balance	(1,163)
Foreign currency translation adjustments
Beginning balance	207
Other comprehensive income (loss) before reclassifications	41
Income taxes	0
Net other comprehensive income (loss) before reclassifications	41
Amounts reclassified from cumulative other comprehensive income (loss)(1)	0
Income taxes	0
Net amounts reclassified from cumulative other comprehensive income (loss)	0
Total other comprehensive income	41
Ending balance	248
Prior service credits (costs) \| Pension
Beginning balance	(11)
Other comprehensive income (loss) before reclassifications	0
Income taxes	0
Net other comprehensive income (loss) before reclassifications	0
Amounts reclassified from cumulative other comprehensive income (loss)(1)	1
Income taxes	(1)
Net amounts reclassified from cumulative other comprehensive income (loss)	0
Total other comprehensive income	0
Ending balance	(11)
Prior service credits (costs) \| Other Postretirement Benefits
Beginning balance	35
Other comprehensive income (loss) before reclassifications	0
Income taxes	0
Net other comprehensive income (loss) before reclassifications	0
Amounts reclassified from cumulative other comprehensive income (loss)(1)	(2)
Income taxes	0
Net amounts reclassified from cumulative other comprehensive income (loss)	(2)
Total other comprehensive income	(2)
Ending balance	33
Actuarial losses \| Pension
Beginning balance	(1,372)
Other comprehensive income (loss) before reclassifications	(22)
Income taxes	6
Net other comprehensive income (loss) before reclassifications	(16)
Amounts reclassified from cumulative other comprehensive income (loss)(1)	38
Income taxes	(13)
Net amounts reclassified from cumulative other comprehensive income (loss)	25
Total other comprehensive income	9
Ending balance	(1,363)
Actuarial losses \| Other Postretirement Benefits
Beginning balance	(77)
Other comprehensive income (loss) before reclassifications	0
Income taxes	0
Net other comprehensive income (loss) before reclassifications	0
Amounts reclassified from cumulative other comprehensive income (loss)(1)	2
Income taxes	(1)
Net amounts reclassified from cumulative other comprehensive income (loss)	1
Total other comprehensive income	1
Ending balance	(76)
Unrealized gains on available-for-sale securities
Beginning balance	6
Other comprehensive income (loss) before reclassifications	0
Income taxes	0
Net other comprehensive income (loss) before reclassifications	0
Amounts reclassified from cumulative other comprehensive income (loss)(1)	0
Income taxes	0
Net amounts reclassified from cumulative other comprehensive income (loss)	0
Total other comprehensive income	0
Ending balance	$ 6

SHARE-BASED COMPENSATION - Weighted Average Assumptions Used in Estimating the Value of Stock Options Granted (Detail) - Stock options	3 Months Ended
	Mar. 31, 2016 $ / shares Rate
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	25.43%
Expected dividends	5.37%
Expected term (in years)	4 years 11 months 12 days
Risk-free rate	1.28%
Weighted average grant date fair value \| $ / shares	$ 2.73

SHARE-BASED COMPENSATION - Weighted Average Assumptions Used in Estimating the Value of Performance Share Units Granted (Detail) - Performance share units	3 Months Ended
	Mar. 31, 2016 $ / shares Rate
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	1/1/2016 – 12/31/2018
Valuation date closing stock price \| $ / shares	$ 23.09
Expected dividends	5.37%
Risk-free rate minimum	0.48%
Risk-free rate maximum	0.93%
Expected volatility minimum	23.57%
Expected volatility maximum	28.09%

SHARE-BASED COMPENSATION - Weighted Average Assumptions Used to Remeasure the Value of Stock Appreciation Rights (Detail) - Stock appreciation rights	3 Months Ended
	Mar. 31, 2016 $ / shares Rate
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	25.15%
Expected dividends	4.12%
Expected term (in years)	2 years 6 months 18 days
Risk-free rate	0.98%
Weighted average fair value \| $ / shares	$ 7.52

SHARE-BASED COMPENSATION - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Feb. 19, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock issued as a result of restricted stock unit vesting, performance share unit vesting and stock option exercises	1,033,647
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	6,121,835
Weighted average exercise price of stock options granted	$ 23.09
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	1,954,796
Vested	947,628
Weighted average fair value of units granted	$ 23.09
Performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	428,794
Vested	268,197
Weighted average fair value of units granted	$ 20.83
Stock appreciation rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	106,752
Minimum \| Performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Final number of shares awarded of each grant's target	0.00%
Maximum \| Performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Final number of shares awarded of each grant's target	150.00%
Plum Creek [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of stock options(4)			$ 5
Acceleration of share-based compensation related to qualifying terminations	$ 19	$ 0
Plum Creek [Member] \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	1,953,128
Fair value of stock options(4)			$ 5
Plum Creek [Member] \| Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	1,248,006
Accelerated vesting of replacement RSUs	501,135
Acceleration of share-based compensation related to qualifying terminations	$ 14
Plum Creek [Member] \| Value management awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value management awards assumed	289,910
Acceleration of share-based compensation related to qualifying terminations	$ 5

CHARGES FOR INTEGRATION AND RESTRUCTURING, CLOSURES AND ASSET IMPAIRMENTS - Items Included in Our Integration and Restructuring, Closure and Asset Impairment Charges (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Charges related to integration and restructuring
Termination benefits	$ 45
Charges related to closures and other restructuring activities	7	$ 1
Impairments of long-lived assets	0	13
Total charges for integration and restructuring, closures and impairments	117	14
Plum Creek [Member]
Charges related to integration and restructuring
Termination benefits	45	0
Acceleration of share-based compensation related to qualifying terminations	19	0
Acceleration of pension benefits related to qualifying terminations	5	0
Professional services	39	0
Other integration and restructuring costs	2	0
Total integration and restructuring charges related to our merger with Plum Creek	$ 110	$ 0	$ 14

CHARGES FOR INTEGRATION AND RESTRUCTURING, CLOSURES AND ASSET IMPAIRMENTS - Changes in accrued severance related to integration and restructuring (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($)
Restructuring Cost and Reserve [Line Items]
Accrued severance as of December 31, 2015	$ 5
Charges	45
Payments	(17)
Accrued severance as of March 31, 2016	$ 33

CHARGES FOR INTEGRATION AND RESTRUCTURING, CLOSURES AND ASSET IMPAIRMENTS - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Restructuring Cost and Reserve [Line Items]
Termination benefits	$ 45
Noncash impairment charge related to a nonstrategic asset	0	$ 13
Fair Value, Inputs, Level 3 \| Unallocated Items
Restructuring Cost and Reserve [Line Items]
Noncash impairment charge related to a nonstrategic asset		13
Plum Creek [Member]
Restructuring Cost and Reserve [Line Items]
Termination benefits	$ 45	$ 0

OTHER OPERATING COSTS (INCOME), NET - Items Included in Other Operating Costs (Income), Net (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Gain on disposition of nonstrategic assets	$ (36)	$ (2)
Foreign exchange losses (gains), net	(13)	29
Litigation expense, net	3	5
Other, net	(15)	(11)
Total other operating costs (income), net	$ (61)	$ 21

OTHER OPERATING COSTS (INCOME), NET - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Gain on disposition of nonstrategic assets	$ 36	$ 2

INCOME TAXES - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Estimated annual effective tax rate for our Taxable REIT Subsidiary	32.00%
Receivables for taxes	$ 25	$ 30
Deferred tax assets	15	$ 4
Tax liability from potential adjustment	100
Gain from potential tax adjustment	600
Plum Creek [Member]
Receivables for taxes	4
Deferred tax assets	$ 59
Maximum
Percentage of gain distributed in common stock	80.00%

CONDENSED CONSOLIDATING FINANCIAL INFORMATION Condensed Consolidating Financial Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Cash and Cash Equivalents, at Carrying Value, Including Discontinued Operations		$ 1,158	$ 1,012	$ 1,580
Net sales	$ 1,835	1,727
Cost of products sold	1,475	1,385
Gross margin	360	342
Other operating expenses, net	174	142
Operating income	186	200
Non-operating expense, net	(85)	(80)
Earnings before income taxes	101	120
Income taxes	20	19
Net earnings	81	101
Dividends on preference shares	(11)	(11)
Net earnings attributable to Weyerhaeuser common shareholders	70	90
Foreign currency translation adjustments	41	(47)
Actuarial gains, net of tax expense	10	62
Prior service costs, net of tax expense	(2)	(2)
Unrealized gains on available-for-sale securities	0	1
Total other comprehensive income	49	14
Comprehensive income (loss)	130	115
Cash and cash equivalents	415		1,012
Other current assets	1,415		1,162
Total current assets	1,830		2,174
Property and equipment, net	2,763		2,572
Timber and timberlands at cost, net	14,548		6,480
Investments in and advances to subsidiaries	0		0
Other assets	2,638		1,244
Total assets			12,470
Total current liabilities	984		875
Note payable to Timberland Venture	835		0
Long-term debt	7,803		4,875
Other long-term liabilities	1,876		1,851
Total liabilities	11,498		7,601
Mandatory convertible preference shares	14		14
Common shares	948		638
Other equity	9,319		4,217
Total equity	10,281		4,869
Total liabilities and equity	21,779		12,470
Net cash from (used in) operations	47	87
Capital expenditures	(73)	(89)
Acquisition of timberlands	(6)	(32)
Proceeds from sale of non-strategic assets	70	2
Issuance of note to parent		0
Distributions from joint ventures	24	0
Cash acquired in merger with Plum Creek	9	0
Distribution from subsidiaries	0	0
Net cash from (used in) investing activities	24	(119)
Net proceeds from issuance of debt	1,098	0
Payments on debt	(720)	0
Proceeds from note from subsidiary		0
Cash dividends on common shares	(241)	(152)
Repurchase of common stock	(798)	(253)
Distribution to parent	0	0
Other	(7)	15
Net cash from (used in) financing activities	(668)	(390)
Parent Company [Member]
Net sales	186	198
Cost of products sold	57	61
Gross margin	129	137
Other operating expenses, net	81	19
Operating income	48	118
Non-operating expense, net	(12)	(6)
Earnings before income taxes	36	112
Income taxes	0	0
Net earnings	36	112
Dividends on preference shares	(11)	(11)
Net earnings attributable to Weyerhaeuser common shareholders	25	101
Foreign currency translation adjustments	0	0
Actuarial gains, net of tax expense	2	5
Prior service costs, net of tax expense	0	0
Unrealized gains on available-for-sale securities	0	0
Total other comprehensive income	2	5
Comprehensive income (loss)	38	117
Cash and cash equivalents	216		673
Other current assets	54		7
Total current assets	270		680
Property and equipment, net	165		167
Timber and timberlands at cost, net	3,485		3,538
Investments in and advances to subsidiaries	10,896		2,948
Other assets	88		88
Total assets	14,904		7,421
Total current liabilities	141		66
Note payable to Timberland Venture	0
Long-term debt	2,743		1,645
Other long-term liabilities	91		91
Total liabilities	2,975		1,802
Mandatory convertible preference shares	14		14
Common shares	948		638
Other equity	10,967		4,967
Total equity	11,929		5,619
Total liabilities and equity	14,904		7,421
Net cash from (used in) operations	29	(50)
Capital expenditures	(14)	(19)
Acquisition of timberlands	0	(26)
Proceeds from sale of non-strategic assets	0	0
Issuance of note to parent		0
Distributions from joint ventures	0
Cash acquired in merger with Plum Creek	0
Distribution from subsidiaries	196	144
Net cash from (used in) investing activities	182	99
Net proceeds from issuance of debt	1,098
Payments on debt	(720)
Proceeds from note from subsidiary		600
Cash dividends on common shares	(241)	(152)
Repurchase of common stock	(798)	(253)
Distribution to parent	0	0
Other	(7)	11
Net cash from (used in) financing activities	(668)	206
Subsidiary Issuer [Member]
Guaranteed registered debt securities	894
Net sales	27	0
Cost of products sold	24	0
Gross margin	3	0
Other operating expenses, net	22	0
Operating income	(19)	0
Non-operating expense, net	(6)	0
Earnings before income taxes	(25)	0
Income taxes	0	0
Net earnings	(25)	0
Dividends on preference shares	0	0
Net earnings attributable to Weyerhaeuser common shareholders	(25)	0
Foreign currency translation adjustments	0	0
Actuarial gains, net of tax expense	0	0
Prior service costs, net of tax expense	0	0
Unrealized gains on available-for-sale securities	0	0
Total other comprehensive income	0	0
Comprehensive income (loss)	(25)	0
Cash and cash equivalents	29		0
Other current assets	7		0
Total current assets	36		0
Property and equipment, net	66		0
Timber and timberlands at cost, net	5,713		0
Investments in and advances to subsidiaries	4,535		0
Other assets	143		0
Total assets	10,493		0
Total current liabilities	59		0
Note payable to Timberland Venture	0
Long-term debt	1,829		0
Other long-term liabilities	67		0
Total liabilities	1,955		0
Mandatory convertible preference shares	0		0
Common shares	0		0
Other equity	8,538		0
Total equity	8,538		0
Total liabilities and equity	10,493		0
Net cash from (used in) operations	25	0
Capital expenditures	0	0
Acquisition of timberlands	0	0
Proceeds from sale of non-strategic assets	0	0
Issuance of note to parent		0
Distributions from joint ventures	0
Cash acquired in merger with Plum Creek	4
Distribution from subsidiaries	0	0
Net cash from (used in) investing activities	4	0
Net proceeds from issuance of debt	0
Payments on debt	0
Proceeds from note from subsidiary		0
Cash dividends on common shares	0	0
Repurchase of common stock	0	0
Distribution to parent	0	0
Other	0	0
Net cash from (used in) financing activities	0	0
Non-Guarantor Subsidiaries [Member]
Net sales	1,808	1,699
Cost of products sold	1,577	1,495
Gross margin	231	204
Other operating expenses, net	71	123
Operating income	160	81
Non-operating expense, net	(67)	(74)
Earnings before income taxes	93	7
Income taxes	(20)	(19)
Net earnings	73	(12)
Dividends on preference shares	0	0
Net earnings attributable to Weyerhaeuser common shareholders	73	(12)
Foreign currency translation adjustments	41	(47)
Actuarial gains, net of tax expense	8	57
Prior service costs, net of tax expense	(2)	(2)
Unrealized gains on available-for-sale securities	0	1
Total other comprehensive income	47	9
Comprehensive income (loss)	120	(3)
Cash and cash equivalents	170		339
Other current assets	1,359		1,161
Total current assets	1,529		1,500
Property and equipment, net	2,532		2,405
Timber and timberlands at cost, net	5,373		2,965
Investments in and advances to subsidiaries	781		0
Other assets	3,042		1,791
Total assets	13,257		8,661
Total current liabilities	785		814
Note payable to Timberland Venture	835
Long-term debt	3,831		3,830
Other long-term liabilities	1,718		1,760
Total liabilities	7,169		6,404
Mandatory convertible preference shares	0		0
Common shares	0		0
Other equity	6,088		2,257
Total equity	6,088		2,257
Total liabilities and equity	13,257		8,661
Net cash from (used in) operations	(7)	137
Capital expenditures	(59)	(70)
Acquisition of timberlands	(6)	(6)
Proceeds from sale of non-strategic assets	70	2
Issuance of note to parent		(600)
Distributions from joint ventures	24
Cash acquired in merger with Plum Creek	5
Distribution from subsidiaries	0	0
Net cash from (used in) investing activities	34	(674)
Net proceeds from issuance of debt	0
Payments on debt	0
Proceeds from note from subsidiary		0
Cash dividends on common shares	0	0
Repurchase of common stock	0	0
Distribution to parent	(196)	(144)
Other	0	4
Net cash from (used in) financing activities	(196)	(140)
Consolidation, Eliminations [Member]
Net sales	(186)	(170)
Cost of products sold	(183)	(171)
Gross margin	(3)	1
Other operating expenses, net	0	0
Operating income	(3)	1
Non-operating expense, net	0	0
Earnings before income taxes	(3)	1
Income taxes	0	0
Net earnings	(3)	1
Dividends on preference shares	0	0
Net earnings attributable to Weyerhaeuser common shareholders	(3)	1
Foreign currency translation adjustments	0	0
Actuarial gains, net of tax expense	0	0
Prior service costs, net of tax expense	0	0
Unrealized gains on available-for-sale securities	0	0
Total other comprehensive income	0	0
Comprehensive income (loss)	(3)	1
Cash and cash equivalents	0		0
Other current assets	(5)		(6)
Total current assets	(5)		(6)
Property and equipment, net	0		0
Timber and timberlands at cost, net	(23)		(23)
Investments in and advances to subsidiaries	(16,212)		(2,948)
Other assets	(635)		(635)
Total assets	(16,875)		(3,612)
Total current liabilities	(1)		(5)
Note payable to Timberland Venture	0
Long-term debt	(600)		(600)
Other long-term liabilities	0		0
Total liabilities	(601)		(605)
Mandatory convertible preference shares	0		0
Common shares	0		0
Other equity	(16,274)		(3,007)
Total equity	(16,274)		(3,007)
Total liabilities and equity	(16,875)		$ (3,612)
Net cash from (used in) operations	0	0
Capital expenditures	0	0
Acquisition of timberlands	0	0
Proceeds from sale of non-strategic assets	0	0
Issuance of note to parent		600
Distributions from joint ventures	0
Cash acquired in merger with Plum Creek	0
Distribution from subsidiaries	(196)	(144)
Net cash from (used in) investing activities	(196)	456
Net proceeds from issuance of debt	0
Payments on debt	0
Proceeds from note from subsidiary		(600)
Cash dividends on common shares	0	0
Repurchase of common stock	0	0
Distribution to parent	196	144
Other	0	0
Net cash from (used in) financing activities	$ 196	$ (456)