Entity Central Index Key Non-Operating pension and other postretirement benefit (costs) credits. This element represents the income or (loss) from continuing operations (before interest expense) attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before, interest expense, income taxes, extraordinary items, and noncontrolling interest. Cover [Abstract] Entity Registrant Name Entity Registrant Name Trading Symbol Trading Symbol Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Current Reporting Status Entity Current Reporting Status Entity Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Entity Shell Company Entity Shell Company Entity File Number Entity File Number Entity Incorporation, State or Country Code Entity Incorporation State Country Code Entity Tax Identification Number Entity Tax Identification Number Entity Address, Address Line One Entity Address Address Line1 Entity Address, City or Town Entity Address City Or Town Entity Address, State or Province Entity Address State Or Province Entity Address, Postal Zip Code Entity Address Postal Zip Code City Area Code City Area Code Local Phone Number Local Phone Number Document Quarterly Report Document Quarterly Report Document Transition Report Document Transition Report Entity Interactive Data Current Entity Interactive Data Current Title of 12(b) Security Security12b Title Security Exchange Name Security Exchange Name Income Statement [Abstract] Net sales (Note 3) Revenues Costs of sales Cost Of Goods And Services Sold Gross margin Gross Profit Selling expenses Selling Expense General and administrative expenses General And Administrative Expense Other operating costs, net (Note 15) Other Operating Income Expense Net Operating income Operating Income Loss Non-operating pension and other postretirement benefit costs (Note 7) Non Operating Pension And Other Post Retirement Benefit Costs Credits Interest income and other Interest And Other Income Interest expense, net of capitalized interest Interest Expense Earnings (loss) before income taxes Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest Income taxes (Note 16) Income Tax Expense Benefit Net earnings (loss) Net Income Loss Earnings (loss) per share, basic and diluted (Note 4) Earnings Per Share Basic And Diluted Weighted average shares outstanding (in thousands) (Note 4): Weighted Average Number Of Shares Outstanding [Abstract] Basic Weighted Average Number Of Shares Outstanding Basic Diluted Weighted Average Number Of Diluted Shares Outstanding Statement Of Income And Comprehensive Income [Abstract] Net earnings (loss) Other comprehensive income (loss): Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent [Abstract] Foreign currency translation adjustments Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax Changes in unamortized actuarial loss, net of tax expense of $16 and $111 Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax Changes in unamortized net prior service credit, net of tax expense of $0 and $0 Other Comprehensive Income Defined Benefit Plan Net Prior Service Costs Credit Arising During Period Net Of Tax Total other comprehensive income Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent Total comprehensive income Comprehensive Income Net Of Tax Changes in unamortized actuarial loss, tax expense (benefit) Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax Changes in unamortized net prior service credit, tax benefit (expense) Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Benefit Plan Improvement Tax Effect Construction in progress. Timber and timber lands at cost, less depletion. Amount after amortization of minerals and mineral rights. Long term debt excluding lines of credit current. Statement Of Financial Position [Abstract] ASSETS Assets [Abstract] Current assets: Assets Current [Abstract] Cash and cash equivalents Cash And Cash Equivalents At Carrying Value Receivables, net Accounts Receivable Net Current Receivables for taxes Income Taxes Receivable Inventories (Note 5) Inventory Net Assets held for sale Assets Held For Sale Not Part Of Disposal Group Current Prepaid expenses and other current assets Prepaid Expense Current Current restricted financial investments held by variable interest entities (Note 6) Restricted Investments Current Total current assets Assets Current Property and equipment, less accumulated depreciation of $3,460 and $3,477 Property Plant And Equipment Net Construction in progress Construction In Progress Timber and timberlands at cost, less depletion Timber And Timber Lands At Cost Less Depletion Minerals and mineral rights, less depletion Minerals And Mineral Rights Deferred tax assets Deferred Tax Assets Net Noncurrent Other assets Other Assets Noncurrent Total assets Assets LIABILITIES AND EQUITY Liabilities [Abstract] Current liabilities: Liabilities Current [Abstract] Current maturities of long-term debt (Note 9) Long Term Debt Excluding Lines Of Credit Current Borrowings on line of credit (Note 9) Lines Of Credit Current Accounts payable Accounts Payable Current Accrued liabilities (Note 8) Accrued Liabilities Current Total current liabilities Liabilities Current Long-term debt, net (Note 9) Long Term Debt Noncurrent Deferred tax liabilities Deferred Tax Liabilities Noncurrent Deferred pension and other postretirement benefits (Note 7) Pension And Other Postretirement And Postemployment Benefit Plans Liabilities Noncurrent Other liabilities Other Liabilities Noncurrent Total liabilities Liabilities Commitments and contingencies (Note 11) Commitments And Contingencies Equity: Stockholders Equity [Abstract] Common shares: $1.25 par value; authorized 1,360 million shares; issued and outstanding: 746,206 thousand shares at March 31, 2020 and 745,300 thousand shares at December 31, 2019 Common Stock Value Outstanding Other capital Additional Paid In Capital Common Stock Accumulated deficit Retained Earnings Accumulated Deficit Accumulated other comprehensive loss (Note 12) Accumulated Other Comprehensive Income Loss Net Of Tax Total equity Stockholders Equity Total liabilities and equity Liabilities And Stockholders Equity Property and equipment, accumulated depreciation Accumulated Depreciation Depletion And Amortization Property Plant And Equipment 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 Basis of Land Sold The component of income tax expense for the period representing the increase (decrease) in the entity's deferred tax assets and liabilities pertaining to continuing and discontinued operations. Payments for capital expenditures of property plant and equipment. Repayments of long term debt excluding related party debt. Statement Of Cash Flows [Abstract] Cash flows from operations: Net Cash Provided By Used In Operating Activities [Abstract] Noncash charges (credits) to earnings (loss): Adjustments Noncash Items To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Depreciation, depletion and amortization Depreciation Depletion And Amortization Basis of real estate sold Basisof Land Sold Deferred income taxes, net Deferred Income Tax Expense Benefit Including Continuing And Discontinued Operations Pension and other postretirement benefits (Note 7) Pension And Other Postretirement Benefit Expense Share-based compensation expense (Note 13) Share Based Compensation Change in: Increase Decrease In Operating Capital [Abstract] Receivables, net Increase Decrease In Receivables Receivables and payables for taxes Increase Decrease In Income Taxes Inventories Increase Decrease In Inventories Prepaid expenses and other current assets Increase Decrease In Prepaid Deferred Expense And Other Assets Accounts payable and accrued liabilities Increase Decrease In Accounts Payable And Accrued Liabilities Pension and postretirement benefit contributions and payments Pension And Other Postretirement Benefit Contributions Other Increase Decrease In Other Operating Capital Net Net cash from operations Net Cash Provided By Used In Operating Activities Cash flows from investing activities: Net Cash Provided By Used In Investing Activities [Abstract] Capital expenditures for property and equipment Payments For Capital Expenditures Of Property Plant And Equipment Capital expenditures for timberlands reforestation Payments For Capital Improvements Proceeds from note receivable held by variable interest entities (Note 6) Proceeds From Collection Of Notes Receivable Proceeds from sale of Montana timberlands (Note 14) Proceeds From Sale Of Property Plant And Equipment Other Payments For Proceeds From Other Investing Activities Net cash from investing activities Net Cash Provided By Used In Investing Activities Cash flows from financing activities: Net Cash Provided By Used In Financing Activities [Abstract] Cash dividends on common shares Payments Of Dividends Common Stock Net proceeds from issuance of long-term debt (Note 9) Proceeds From Issuance Of Long Term Debt Payments on long-term debt (Note 9) Repayments Of Long Term Debt Excluding Related Party Debt Proceeds from borrowings on line of credit (Note 9) Proceeds From Lines Of Credit Payments on line of credit (Note 9) Repayments Of Lines Of Credit Proceeds from exercise of stock options Proceeds From Stock Options Exercised Repurchases of common shares (Note 4) Payments For Repurchase Of Common Stock Other Proceeds From Payments For Other Financing Activities Net cash from financing activities Net Cash Provided By Used In Financing Activities Net change in cash and cash equivalents Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect Cash and cash equivalents at beginning of period Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Cash and cash equivalents at end of period Cash paid (received) during the period for: Supplemental Cash Flow Information [Abstract] Interest, net of amount capitalized of $1 and $1 Interest Paid Net Income taxes, net of refunds Income Taxes Paid Net Interest, amount capitalized Interest Paid Capitalized Adjustments related to new accounting pronouncement and other. CONSOLIDATED STATEMENT OF CHANGES IN EQUITY [Abstract] C O N S O L I D A T E D S T A T E M E N T O F C H A N G E S I N E Q U I T Y [Abstract] Statement [Table] Statement [Table] Equity Components Statement Equity Components [Axis] Equity Component Equity Component [Domain] Common shares: Common Stock [Member] Other capital: Additional Paid In Capital [Member] Retained earnings (accumulated deficit): Retained Earnings [Member] Accumulated other comprehensive loss: Accumulated Other Comprehensive Income [Member] Statement [Line Items] Statement [Line Items] Balance at beginning of period Issued for exercise of stock options and vested restricted stock units Stock Issued During Period Value Stock Options Exercised Repurchases of common shares (Note 4) Stock Repurchased During Period Value Shared-based compensation Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value Other transactions, net Adjustments To Additional Paid In Capital Other Dividends on common shares Dividends Common Stock Adjustments related to accounting pronouncements and other Adjustments Related To New Accounting Pronouncement And Other Other comprehensive income Other Comprehensive Income Loss Net Of Tax Balance at end of period Dividends paid per common share Common Stock Dividends Per Share Cash Paid Organization Consolidation And Presentation Of Financial Statements [Abstract] BASIS OF PRESENTATION Organization Consolidation And Presentation Of Financial Statements Disclosure [Text Block] Segment Reporting [Abstract] BUSINESS SEGMENTS Segment Reporting Disclosure [Text Block] Revenue From Contract With Customer [Abstract] REVENUE RECOGNITION Revenue From Contract With Customer [Text Block] Earnings Per Share [Abstract] NET EARNINGS (LOSS) PER SHARE AND SHARE REPURCHASES Earnings Per Share [Text Block] Inventory Disclosure [Abstract] INVENTORIES Inventory Disclosure [Text Block] Equity Method Investments And Joint Ventures [Abstract] VARIABLE INTEREST ENTITIES Variable Interest Entity Disclosure [Text Block] Pension And Other Postretirement Benefit Expense [Abstract] PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS Pension And Other Postretirement Benefits Disclosure [Text Block] Accrued Liabilities Current [Abstract] ACCRUED LIABILITIES Accounts Payable And Accrued Liabilities Disclosure [Text Block] Debt Disclosure [Abstract] LONG-TERM DEBT AND LINE OF CREDIT Debt Disclosure [Text Block] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] FAIR VALUE OF FINANCIAL INSTRUMENTS Fair Value Disclosures [Text Block] Commitments And Contingencies Disclosure [Abstract] LEGAL PROCEEDINGS, COMMITMENTS AND CONTINGENCIES Commitments And Contingencies Disclosure [Text Block] Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract] ACCUMULATED OTHER COMPREHENSIVE LOSS Comprehensive Income Note [Text Block] Share Based Compensation [Abstract] SHARE-BASED COMPENSATION Disclosure Of Compensation Related Costs Share Based Payments [Text Block] Discontinued Operations And Disposal Groups [Abstract] DIVESTITURE Disposal Groups Including Discontinued Operations Disclosure [Text Block] Other Income [Abstract] OTHER OPERATING COSTS, NET Other Income And Other Expense Disclosure [Text Block] Income Tax Disclosure [Abstract] INCOME TAXES Income Tax Disclosure [Text Block] Consolidation Consolidation Policy [Text Block] Earnings Per Share Earnings Per Share Policy [Text Block] Fair Value of Financial Instruments Fair Value Of Financial Instruments Policy Reconciliation of Business Segment Information in Consolidated Statement of Operations Reconciliation Of Revenue From Segments To Consolidated [Text Block] Revenue by Major Products Disaggregation Of Revenue Table [Text Block] Dilutive Potential Common Shares Schedule Of Earnings Per Share Basic And Diluted Table [Text Block] Potential Shares Not Included in the Computation of Diluted Earnings (Loss) per Share Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Text Block] Inventories Schedule Of Inventory Current Table [Text Block] Components of Net Periodic Benefit Cost Schedule Of Net Benefit Costs Table [Text Block] Accrued Liabilities Schedule Of Accrued Liabilities Table [Text Block] Estimated Fair Values and Carrying Values of Long-Term Debt and Line of Credit Schedule Of Fair Value Assets And Liabilities Measured On Recurring Basis Table [Text Block] Changes in Amounts Included in Our Accumulated Other Comprehensive Loss Schedule Of Accumulated Other Comprehensive Income Loss Table [Text Block] Schedule of Share-Based Compensation Activity Schedule Of Share Based Compensation Activity Table [Text Block] 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 In Estimating Value Of Performance Share Units Granted Weighted Average Assumptions Used In Estimating Value Of Performance Share Units Granted Table [Text Block] Income and Expense Items Included in Other Operating Costs, Net Schedule Of Other Operating Cost And Expense By Component [Text Block] Reconciliation From Segment Totals To Consolidated [Abstract] Reconciliation Of Revenue From Segments To Consolidated [Table] Reconciliation Of Revenue From Segments To Consolidated [Table] Segments Statement Business Segments [Axis] Segments Segment [Domain] Timberlands [Member] Timberlands Timberlands [Member] Real Estate, Energy and Natural Resources (RE & ENR) Member Real Estate & ENR R E E N R [Member] Wood Products [Member] Wood Products Wood Products [Member] Consolidation Items Consolidation Items [Axis] Consolidation Items Consolidation Items [Domain] Operating Segments Operating Segments [Member] Intersegment eliminations Intersegment Elimination [Member] Unallocated items Corporate Non Segment [Member] Segment Reporting, Revenue Reconciling Item Segment Reporting Revenue Reconciling Item [Line Items] Sales to unaffiliated customers Net contribution (charge) to earnings Net Contribution To Earnings Income taxes Disaggregation Of Revenue [Table] Disaggregation Of Revenue [Table] Contract with Customer, Sales Channel Contract With Customer Sales Channel [Axis] Contract with Customer, Sales Channel Contract With Customer Sales Channel [Domain] Domestic [Member] Domestic grade sales Domestic [Member] Export sales. Export grade sales Export Sales [Member] Geographical Statement Geographical [Axis] Geographical Segment Geographical [Domain] West [Member] West West [Member] South [Member] South South [Member] North [Member] North North [Member] Product and Service Product Or Service [Axis] Product and Service Products And Services [Domain] Delivered logs [Member] Delivered logs Deliveredlogs [Member] Stumpage and pay-as-cut timber [Member] Stumpage and pay-as-cut timber Stumpageandpayascuttimber [Member] Recreational and other lease revenue [Member] Recreational and other lease revenue Recreationalandotherleaserevenue [Member] Structural lumber [Member] Structural lumber Structurallumber [Member] Oriented Strand Board [Member] Oriented strand board Oriented Strand Board [Member] Engineered Solid Section [Member] Engineered solid section Engineered Solid Section [Member] Engineered I-joists [Member] Engineered I-joists Engineered Ijoists [Member] Softwood Plywood [Member] Softwood plywood Softwood Plywood [Member] Medium density fiberboard [Member] Medium density fiberboard Mediumdensityfiberboard [Member] complementary building products [Member] Complementary building products Complementarybuildingproducts [Member] Other products [Member] Other Otherproducts [Member] Real estate sales [Member] Real Estate Realestatesales [Member] Energy and natural resources products [Member] Energy and natural resources Energyandnaturalresourcesproducts [Member] Revenue from External Customer Disaggregation Of Revenue [Line Items] Net sales Earnings (loss) per share, basic and diluted Earnings per share basic and diluted. Earnings per share basic and diluted. Earnings Per Share Basic And Diluted [Table] Earnings Per Share Basic And Diluted [Table] Award Type Award Type [Axis] Award Type Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name [Domain] Stock options Employee Stock Option [Member] Restricted stock units Restricted Stock [Member] Earnings Per Share Basic And Diluted [Line Items] Earnings Per Share Basic And Diluted [Line Items] Dilutive potential common shares Incremental Common Shares Attributable To Share Based Payment Arrangements Diluted Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table] Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table] Antidilutive Securities Antidilutive Securities Excluded From Computation Of Earnings Per Share By Antidilutive Securities [Axis] Antidilutive Securities, Name Antidilutive Securities Name [Domain] Performance share units Performance Shares [Member] Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Potential shares not included in the computation of diluted earnings (loss) per share Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount Stock repurchase program, authorized amount Stock Repurchase Program Authorized Amount1 Shares repurchased during period Stock Repurchased During Period Shares Shares repurchased during period value Stock repurchase program, remaining authorized repurchase amount Stock Repurchase Program Remaining Authorized Repurchase Amount1 The amount of FIFO (first in first out) inventory and moving average cost inventory present at the reporting date when inventory is valued using different valuation methods. Inventory Current [Table] Inventory Current [Table] Inventory Public Utilities Inventory [Axis] Inventory Public Utilities Inventory Type [Domain] Logs and Chips [Member] Logs Logs And Chips [Member] Lumber, Plywood and Panels [Member] Lumber, plywood, panels and fiberboard Lumber Plywoodand Panels [Member] Lumber, Plywood, Panels and Engineered Lumber [Member] Lumber, plywood, panels, fiberboard and engineered wood products Lumber Plywood Panels And Engineered Lumber [Member] Inventory, Other Products [Member] Other products Inventory Other Products [Member] Inventory, Raw Materials and Supplies [Member] Materials and supplies Inventory Raw Materialsand Supplies [Member] Inventory [Line Items] Inventory [Line Items] LIFO inventories L I F O Inventory Amount FIFO or moving average cost inventories F I F O And Moving Average Cost Methods Inventories Total Increase in inventory amount if FIFO would have been used Inventory L I F O Reserve Proceeds from note receivable held by variable interest entities Proceeds From Related Party Debt Payment of SPE liabilities Repayments Of Related Party Debt Current restricted financial investments held by variable interest entities Defined Benefit Plan Net Periodic Benefit Cost [Abstract] Schedule Of Defined Benefit Plans Disclosures [Table] Schedule Of Defined Benefit Plans Disclosures [Table] Retirement Plan Type Retirement Plan Type [Axis] Retirement Plan Type Retirement Plan Type [Domain] Pension Pension Plans Defined Benefit [Member] Other Postretirement Benefits Other Postretirement Benefit Plans Defined Benefit [Member] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Service cost 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 Settlement charge Defined Benefit Plan Recognized Net Gain Loss Due To Settlements1 Total net periodic benefit cost Defined Benefit Plan Net Periodic Benefit Cost Retirement Plan Sponsor Location Retirement Plan Sponsor Location [Axis] Retirement Plan Sponsor Location Retirement Plan Sponsor Location [Domain] Domestic Plan Domestic Plan [Member] U.S. UNITED STATES Defined Benefit Plan, Plan Assets, Increase (Decrease) for Assets Transferred to (from) Plan Defined Benefit Plan Assets Transferred To From Plan Defined Benefit Plan, Plan Assets, Payment for Settlement Defined Benefit Plan Settlements Plan Assets Reduction in settlement charge Current portion of lease liabilities. Customer rebates, volume discounts and deferred income. Accrued Taxes Payable Compensation and employee benefit costs Employee Related Liabilities Current And Noncurrent Current portion of lease liabilities Current Portion Of Lease Liabilities Customer rebates, volume discounts and deferred income Customer Rebates Volume Discounts And Deferred Income Interest Interest Payable Current Taxes payable Accrued Taxes Payable Other Other Accrued Liabilities Current Total Debt Instrument [Table] Debt Instrument [Table] Debt Instrument Debt Instrument [Axis] Debt Instrument, Name Debt Instrument Name [Domain] A 400 percent due 2030. 4.00 percent due in April 2030 A400 Percent Due2030 [Member] A470 percent due 2021. 4.70 percent due 2021 A470 Percent Due2021 [Member] Subsequent Event Type Subsequent Event Type [Axis] Subsequent Event Type Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Event [Member] 4.00 percent due 2029. 4.00 percent due in November 2029 A400 Percent Due2029 [Member] 7.38 percent due 2019. 7.38 percent due in October 2019 A738 Percent Due2019 [Member] Amended and restated. Amended and Restated Amended And Restated [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Debt issued Debt Instrument Face Amount Debt instrument, interest rate, stated percentage Debt Instrument Interest Rate Stated Percentage Proceeds from debt, net of issuance costs Proceeds From Debt Net Of Issuance Costs Debt, maturity date Debt Instrument Maturity Date Debt instrument redemption price. Book value Long Term Debt Debt, redemption price Debt Instrument Redemption Price Pre-tax charge related to early extinguishment of debt. Repayments of debt Repayments Of Debt Pretax charge related to early extinguishment of debt Pre Tax Charge Related To Early Extinguishment Of Debt Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net Line of credit expiration date. Line of credit, maximum borrowing capacity Line Of Credit Facility Maximum Borrowing Capacity Line of credit expiration date Line Of Credit Expiration Date Line of credit expiration period Line Of Credit Facility Expiration Period Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fixed interest rate [Member] Fixed interest rate Fixedinterestrate [Member] Variable interest rate [Member] Variable interest rate Variableinterestrate [Member] FAIR VALUE OF FINANCIAL INSTRUMENTS Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] Long-term debt (including current maturities) and line of credit, carrying value Long-term debt (including current maturities) and line of credit, fair value (Level 2) Long Term Debt Fair Value Accrued estimated remediation costs Environmental Exit Costs Assets Previously Disposed Liability For Remediation Asset retirement obligations Asset Retirement Obligation Accumulated Other Comprehensive Income Loss [Table] Accumulated Other Comprehensive Income Loss [Table] Accumulated pension plans defined benefit plans adjustment. Pension Accumulated Pension Plans Defined Benefit Plans Adjustment [Member] Accumulated other postretirement benefit plans defined benefit plans adjustment. Other Postretirement Benefits Accumulated Other Postretirement Benefit Plans Defined Benefit Plans Adjustment [Member] Accumulated Translation Adjustment And Other [Member] Translation Adjustment And Other Accumulated Translation Adjustment And Other [Member] Accumulated Other Comprehensive Income Loss [Line Items] Accumulated Other Comprehensive Income Loss [Line Items] Other comprehensive income (loss) before reclassifications Other Comprehensive Income Loss Before Reclassifications Net Of Tax Amounts reclassified from accumulated other comprehensive loss to earnings Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax Translation adjustments Disclosure Of Compensation Related Costs Sharebased Payments [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] Share-based Compensation Arrangement by Share-based Payment Award Share Based Compensation Arrangement By Share Based Payment Award [Line Items] 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 Share Based Compensation Arrangement By Share Based Payment Award Additional General Disclosures [Abstract] Statistical Measurement Range [Axis] Statistical Measurement Range [Member] Minimum Minimum [Member] Maximum Maximum [Member] Shares issued during period Share Based Compensation Arrangement By Share Based Payment Award Shares Issued In Period 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 Share Based Compensation Arrangement by Share Based Payment Award, Outstanding Award as Percentage of Shares Issued Maximum percentage of target value. Final number of shares awarded of each grant's target Final Number Of Shares Awarded Of Each Grants Target Maximum percentage of target value Maximum Percentage Of Target Value Share Based Compensation Arrangement by Share Based Payment Award, Performance Period. Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions And Methodology [Abstract] Performance period Share Based Compensation Arrangement By Share Based Payment Award Performance Period Valuation date average stock price Share Price Expected dividends Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate Risk-free rate minimum Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Minimum Risk-free rate maximum Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Maximum Expected volatility minimum Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Minimum Expected volatility maximum Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Maximum Number of acers of timberlands agreed to be sold. Discontinued Operation Additional Disclosures [Abstract] Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Table] Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Table] Montana MALTA 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] Number of acers of timberlands agreed to be sold Number Of Acers Of Timberlands Agreed To Be Sold Proceeds from disposition of operations Proceeds From Divestiture Of Businesses Foreign exchange losses, net Foreign Currency Transaction Gain Loss Before Tax Litigation expense (income), net Gain Loss Related To Litigation Settlement Research and development expenses Research And Development Expense Other, net Other Nonoperating Income Expense Total other operating costs, net Scenario Statement Scenario [Axis] Scenario Scenario Unspecified [Domain] Forecast Scenario Forecast [Member] U.S. federal statutory income tax rate Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate Unrecognized tax benefits Unrecognized Tax Benefits