Inventory Disclosure [Abstract] Statement [Table] Statement [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Statement [Line Items] Statement [Line Items] Inventories Schedule of Inventory, Current [Table Text Block] Statement of Comprehensive Income [Abstract] Net earnings Net Income (Loss) Attributable to Parent Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Actuarial gains, net of tax expense of $15, $25, $40 and $75 OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodAndReclassificationOfNetGainLossRecognizedInNetPeriodPeriodicBenefitCostNetOfTax The accumulated change (increase) decrease in the value of either the projected benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption that has not been recognized in net periodic benefit cost and the adjustment out of other comprehensive income for actuarial (gains) or losses recognized as a component of net periodic benefit cost during the period, after tax. Prior service costs, net of tax benefits of $0, $1, $0, and $0 OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansNetPriorServiceCreditCostArisingDuringPeriodandAmortizationofNetPriorServiceCostRecognizedinNetPeriodicPensionCostNetofTax The credit (cost) resulting from a plan amendment that occurred during the period and has not been recognized in net periodic benefit cost and the adjustment out of other comprehensive income for prior service costs recognized as a component of net period benefit cost during the period, net of tax. Plan amendment includes provisions that grant increased benefits based on service rendered in prior periods. Unrealized gains on available-for-sale securities Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Total other comprehensive income Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Comprehensive income attributable to Weyerhaeuser common shareholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent Share-based Compensation [Abstract] SHARE-BASED COMPENSATION Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Plum Creek [Member] Plum Creek [Member] Plum Creek [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Award Type [Axis] Award Type [Axis] Award Type [Domain] Equity Award [Domain] Stock options Employee Stock Option [Member] Restricted stock units Restricted Stock [Member] Value management awards [Member] Value management awards [Member] Value management awards [Member] Performance share units Performance Shares [Member] Stock appreciation rights Stock Appreciation Rights (SARs) [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures Granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Shares of common stock issued as a result of restricted stock unit vesting, performance share unit vesting and stock option exercises Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period Value management awards assumed Share Based Compensation Arrangement by Share Based Payment Award Liability Awards Asssumed The number of liability awards assumed during the period. Fair value of stock options(4) Value of Replacement Stock Options Issued Value of Replacement Stock Option Awards Issued Accelerated vesting of replacement RSUs Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number Acceleration of share-based compensation related to qualifying terminations (Note 14) Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost Weighted average exercise price of stock options granted Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Weighted average fair value of units granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Final number of shares awarded of each grant's target Final Number Of Shares Awarded Of Each Grant's Target Share Based Compensation Arrangement by Share Based Payment Award, Outstanding Award as Percentage of Shares Issued Earnings Per Share, Basic and Diluted [Abstract] NET EARNINGS PER SHARE Earnings Per Share [Text Block] Business Combinations [Abstract] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Business Acquisition [Line Items] Business Acquisition [Line Items] Number of Plum Creek common shares outstanding(1) Shares, Outstanding Exchange ratio per the merger agreement Equity shares issued or issuable conversion ratio The conversion ratio ratio for equity shares issued or issuable to acquire entity. Weyerhaeuser shares issued in exchange for Plum Creek equity(2) Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Price per Weyerhaeuser common share(3) Business Acquisition, Share Price Aggregate value of Weyerhaeuser common stock issued Business Acquisition, Equity Interest Issued or Issuable, Value Assigned Estimated consideration transferred Business Combination, Consideration Transferred Restructuring and Related Activities [Abstract] Schedule of Restructuring and Related Costs [Table] Schedule of Restructuring and Related Costs [Table] Restructuring Type [Axis] Restructuring Type [Axis] Type of Restructuring [Domain] Type of Restructuring [Domain] Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] CHARGES FOR RESTRUCTURING, CLOSURES AND ASSET IMPAIRMENTS Restructuring, Impairment, and Other Activities Disclosure [Text Block] Accrued Liabilities, Current [Abstract] ACCRUED LIABILITIES Accounts Payable and Accrued Liabilities Disclosure [Text Block] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Fair Value, Inputs, Level 2 Fair Value, Inputs, Level 2 [Member] FAIR VALUE OF FINANCIAL INSTRUMENTS [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] FAIR VALUE OF FINANCIAL INSTRUMENTS Fair Value Disclosures [Text Block] Equity Method Investments and Joint Ventures [Abstract] Equity Method Investments in Joint Ventures Disclosure [Text Block] Equity Method Investments and Joint Ventures Disclosure [Text Block] Defined Benefit Plan, Net Periodic Benefit Cost [Abstract] Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Operating Activities [Axis] Operating Activities [Axis] Operating Activities [Domain] Operating Activities [Domain] Discontinued operations Discontinued Operations [Member] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans [Domain] Defined Benefit Plan and Other Postretirement Benefit Plan [Domain] Pension Pension Plan [Member] Other Postretirement Benefits Other Postretirement Benefit Plan [Member] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Service cost(1) Defined Benefit Plan, Service Cost Interest cost Defined Benefit Plan, Interest Cost Expected return on plan assets Defined Benefit Plan, Expected Return on Plan Assets Amortization of actuarial loss Defined Benefit Plan, Amortization of Gains (Losses) Amortization of prior service cost (credit) Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Accelerated pension costs included in Plum Creek merger-related costs (Note 15) Accelerated Pension Benefits Additional pension benefit cost recognized as a result of an occurrence of an event that accelerates its recognition. Total net periodic benefit cost (credit) Defined Benefit Plan, Net Periodic Benefit Cost Weighted Average Assumptions Used in Estimating the Value of Stock Options Granted Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] 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 Tabular disclosure of the significant assumptions used during the year to estimate the fair value of performance share units, including, but not limited to: (a) expected term of performance share units and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. Weighted Average Assumptions Used to Remeasure the Value of Stock Appreciation Rights Weighted Average Assumptions Used To Remeasure Value Of Stock Appreciation Rights Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock appreciation rights, including, but not limited to: (a) expected term of stock appreciation rights and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] 6.375 percent Mandatory Convertible Preference Shares, Series A Nonredeemable Convertible Preferred Stock [Member] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Share Repurchase Program [Domain] Share Repurchase Program [Domain] Unsettled Share Repurchases [Member] Unsettled Share Repurchases [Member] Unsettled Share Repurchases [Member] Basic earnings per share attributable to Weyerhaeuser shareholders Earnings Per Share, Basic Diluted earnings per share attributable to Weyerhaeuser shareholders Earnings Per Share, Diluted Stock repurchase program, shares repurchased Stock Repurchased and Retired During Period, Shares Stock repurchase program, shares repurchased value Stock Repurchased and Retired During Period, Value Stock repurchase program, authorized repurchase amount Stock Repurchase Program, Authorized Amount Stock repurchase program, remaining authorized repurchase amount Stock Repurchase Program, Remaining Authorized Repurchase Amount Preference shares conversion ratio Preference shares conversion ratio The conversion ratio for the conversion of preference shares. Shares issued upon conversion of stock Conversion of Stock, Shares Issued Preference shares, outstanding Preferred Stock, Shares Outstanding Volume weighted average price per share Volume weighted average price per share Volume weighted average price per common share over the trading period. Pension and Other Postretirement Benefit Expense [Abstract] PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS Pension and Other Postretirement Benefits Disclosure [Text Block] Discontinued Operations and Disposal Groups [Abstract] Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Disposal Group Name [Axis] Disposal Group Name [Axis] Disposal Group Name [Domain] Disposal Group Name [Domain] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Cash and cash equivalents Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents Receivables, less allowances Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net Inventories Disposal Group, Including Discontinued Operation, Inventory, Current Prepaid expenses Disposal Group, Including Discontinued Operation, Prepaid and Other Assets, Current Property and equipment, net Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Noncurrent Construction in progress Disposal Group, Including Discontinued Operation, Construction In Progress Disposal Group, Including Discontinued Operation, Construction In Progress Timber and timberlands at cost, less depletion charged to disposals Disposal Group, Including Discontinued Operation, Timber and Timberlands at cost Disposal Group, Including Discontinued Operation, Timber and Timberlands at cost Investments in and advances to joint ventures Disposal Group, Including Discontinued Operation, Investments in and Advances to Joint Ventures Disposal Group, Including Discontinued Operation, Investments in and Advances to Joint Ventures Total assets of discontinued operations Disposal Group, Including Discontinued Operation, Assets Accounts payable Disposal Group, Including Discontinued Operation, Accounts Payable, Current Accrued liabilities Disposal Group, Including Discontinued Operation, Accrued Liabilities, Current Long-term debt Disposal Group, Including Discontinued Operation, Long-term Debt Disposal Group, Including Discontinued Operation, Long-term Debt Deferred income taxes Disposal Group, Including Discontinued Operation, Deferred Tax Liabilities, Noncurrent Other liabilities Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent Total liabilities of discontinued operations Disposal Group, Including Discontinued Operation, Liabilities Wages, salaries and severance pay Employee-related Liabilities, Current Pension and other postretirement benefits Pension and Other Postretirement Defined Benefit Plans, Current Liabilities Vacation pay Accrued Vacation, Current Taxes – Social Security and real and personal property Accrual for Taxes Other than Income Taxes, Current Interest Interest Payable, Current Customer rebates and volume discounts Customer Refund Liability, Current Deferred income Deferred Revenue, Current Other Other Accrued Liabilities, Current Total Accrued Liabilities, Current Net cash provided by (used in) operating activities Cash Provided by (Used in) Operating Activities, Discontinued Operations Net cash provided by (used in) investing activities Cash Provided by (Used in) Investing Activities, Discontinued Operations Equity Method Investments [Table Text Block] Equity Method Investments [Table Text Block] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Potential Shares Not Included in the Computation of Diluted Earnings per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Consolidation, Policy Consolidation, Policy [Policy Text Block] New Accounting Pronouncements, Policy New Accounting Pronouncements, Policy [Policy Text Block] Earnings Per Share, Policy Earnings Per Share, Policy [Policy Text Block] Fair Value of Financial Instruments, Policy Fair Value of Financial Instruments, Policy [Policy Text Block] Schedule of Equity Method Investments [Table] Schedule of Equity Method Investments [Table] Investment, Name [Axis] Investment, Name [Axis] Investment, Name [Domain] Investment, Name [Domain] Timberland Venture [Member] Timberland Venture [Member] Timberland Venture [Member] Real Estate Development Ventures [Member] Real Estate Development Ventures [Member] Real Estate Development Ventures [Member] Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Equity earnings from joint ventures (Note 7) Income (Loss) From Equity Method Investments from Continuing Operations This item represents the entity's proportionate share (from continuing operations) for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. Investments in and advances to joint ventures Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Income Tax Disclosure [Abstract] INCOME TAXES Income Tax Disclosure [Text Block] Fair Value, Inputs, Level 3 Fair Value, Inputs, Level 3 [Member] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Unallocated Items Corporate, Non-Segment [Member] Noncash impairment charge related to a nonstrategic asset Impairment of Long-Lived Assets Held-for-use Pulp Manufacturing [Member] Pulp Manufacturing [Member] Pulp Manufacturing [Member] Liquid Packaging Board [Member] Liquid Packaging Board [Member] Liquid Packaging Board [Member] Proceeds from divestiture of business Proceeds from Divestiture of Businesses Gain on disposition of nonstrategic assets Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Accrued Liabilities Schedule of Accrued Liabilities [Table Text Block] Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Changes in amounts included in our cumulative other comprehensive income (loss) by component Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Segment Reporting [Abstract] BUSINESS SEGMENTS Segment Reporting Disclosure [Text Block] Statement of Financial Position [Abstract] Receivables, allowances Allowance for Doubtful Accounts Receivable, Current Property and equipment, accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Preference shares, par value Preferred Stock, Par or Stated Value Per Share Preference shares, liquidation Preferred Stock, Liquidation Preference Per Share Preference shares, authorized Preferred Stock, Shares Authorized Preference shares, issued Preferred Stock, Shares Issued Common shares, par value Common Stock, Par or Stated Value Per Share Common shares, authorized Common Stock, Shares Authorized Common shares, issued Common Stock, Shares, Issued Common shares, outstanding Common Stock, Shares, Outstanding Reconciliation of Revenue from Segments to Consolidated Reconciliation of Revenue from Segments to Consolidated [Table Text Block] Reconciliation of Assets from Segment to Consolidated Reconciliation of Assets from Segment to Consolidated [Table Text Block] Debt Disclosure [Abstract] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Senior Note due 2021 [Member] Senior Note due 2021 [Member] Senior Note due 2021 [Member] Senior Note due 2023 [Member] Senior Note due 2023 [Member] Senior Note due 2023 [Member] Installment Note Payable [Member] Installment Note Payable [Member] Installment Note Payable [Member] Note Payable to Timberland Venture [Member] Note Payable to Timberland Venture [Member] Note Payable to Timberland Venture [Member]