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Hydroelectric Assets Impairment Costs [Member] Other Comprehensive Income Loss Reclassification Adjustment For Gain Losses Included In Net Loss Earnings Tax Other comprehensive income loss reclassification adjustment for gain losses included in net loss earnings tax. Reclassification adjustment for losses included in net loss, tax Reclassification adjustment for losses (gains) included in net loss, tax Debt Instrument, Basis Spread on Variable Rate Debt instrument basis spread on variable rate Commitments and contingencies (NOTE 14) Commitments And Contingencies Preliminary determination anti dumping rate on certain canadian softwood lumber imported to the us market. 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Schedule of Assets Acquired and Liabilities Assumed Schedule Of Recognized Identified Assets Acquired And Liabilities Assumed Table [Text Block] Consolidated Entities [Domain] Common stock, shares issued Common Stock Shares Issued Segment Reporting Information [Line Items] Segment Reporting [Line Items] Defined contribution plan, expected contribution amount, remainder of year Defined Contribution Plan Expected Employer Contribution Amount Remainder Of Year Defined contribution plan, expected employer contribution amount, remainder of year. Debt Instrument, Face Amount Aggregate term loan Income Tax Expense (Benefit), Total Income tax expense (benefit) Income tax expense Income tax expense (benefit) (NOTE 6) Tax benefit (expense) Property, Plant and Equipment [Member] Counterparty Name Repurchase Agreement Counterparty Name [Domain] Other Costs. 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Affordable Clean Energy [Member] Affordable Clean Energy [Member] Income Statement [Abstract] Comprehensive Income Note [Text Block] Changes in Accumulated Other Comprehensive (Loss) Income by Component Income Tax Jurisdiction [Axis] Accounting Standards Update and Change in Accounting Principle [Table] Reclassification Out Of Accumulated Other Comprehensive Income [Member] Reclassification Out of Accumulated Other Comprehensive (Loss) Income Reclassification out of Accumulated Other Comprehensive Income Reclassification Out Of Accumulated Other Comprehensive Income [Axis] Related party other payables. 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Entity Address, Country Reclassification out of Accumulated Other Comprehensive Income Reclassification Out Of Accumulated Other Comprehensive Income [Domain] Investments Investment Type Categorization [Member] Other Comprehensive Income Loss Net Of Tax Other comprehensive income (loss) Other comprehensive (loss) income Recent Accounting Pronouncements New Accounting Pronouncements And Changes In Accounting Principles [Text Block] Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] Engineered Absorbent Materials Corporation [Member] Engineered absorbent materials corporation. Engineered Absorbent Materials Corporation [Member] Intangible Asset, Finite-Lived, and Capitalized Cost, Software to be Sold, Leased, or Marketed, Estimated Amortization Expense [Table Text Block] Amortization Expense Related to Intangible Assets Operating expenses Costs And Expenses Consolidated other costs Total assets Assets Title of 12(b) Security Security12b Title Components of Net Periodic Benefit Cost for Pension Plans and Other Post-Retirement Benefit Plans Components Net Periodic Benefit Cost For Pension Plans And Other Post Retirement Benefit Plans Table [Text Block] Components net periodic benefit cost for pension plans and other post retirement benefit plans. Impairment of inventory (NOTE 10) Impairment of Inventory Impairment of inventory. Effective income tax rate minimum tax rate continuing operations. 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Countervailing duty and anti-dumping duty cash deposits on softwood lumber Canadian Dollars [Member] C A D Proceeds from Issuance of Long-Term Debt, Total Issuance of long-term debt, net of debt issue costs Proceeds From Issuance Of Long Term Debt Power Generation Assets Impairment Costs [Member] Power generation assets impairment costs. Coosa Pines, Alabama Mill [Member] Coosa Pines, Alabama Mill. Location, Statement of Financial Position, Balance [Axis] ABL FILO Loan [Member] Asset Based Lending Facility First In Last Out Loan [Member] Asset Based Lending Facility First In Last Out Loan [Member] Customer Relationships [Member] Customer Relationships [Member] Analysis and Reconciliation of Reportable Segment Information Schedule Of Segment Reporting Information By Segment [Text Block] Tissue [Member] Tissue [Member] Tissue. Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Four 2030 Net change in bank indebtedness Proceeds from (Repayments of) Bank Overdrafts Change in revolving credit facility Proceeds From Repayments Of Lines Of Credit Total shareholders' equity Balance Balance Stockholders Equity Related Party Transaction Services Provided To Related Party Related party transaction services provided to related party. Services Other assets (NOTE 9) Other assets, noncurrent Other Assets Noncurrent Other assets Income Taxes Income Tax Disclosure [Text Block] Other Comprehensive Income Unrealized Gain Loss On Net Gains Arising During Period Tax Other comprehensive income unrealized gain loss on net gains arising during period tax. Net losses arising during the period, tax Net (losses) gains arising during the period, tax Due to related party current. Due To Related Party Current Due to related party (NOTE 16) Long-term debt Long Term Debt Fair Value Kingsport, Tennessee mill. 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Increase Decrease In Operating Capital [Abstract] Changes in assets and liabilities, excluding the effects of sale of businesses Final Determination Anti Dumping Rate On Certain Canadian Softwood Lumber Imported To The U S Market Final determination anti dumping rate on certain canadian softwood lumber imported to the u s market. Percentage of final determination anti dumping rate on certain canadian softwood lumber imported to the US market Other Liability, Current, Related Party [Extensible Enumeration] Difference between employer pension and other post-retirement contributions and pension and other post-retirement expense Difference Between Employer Pension And Other Post Retirement Contributions And Pension And Other Post Retirement Expense Difference between employer pension and other post retirement contributions and pension and other post retirement expense. Prepaid expenses Increase Decrease In Prepaid Expense Applicable Margin Rate [Member] Applicable margin rate. Applicable Margin [Member] Climate Change and Air Quality Regulations [Member] Climate change and air quality regulations. Climate Change and Air Quality Regulations [Member] Depreciation and amortization Depreciation Depletion And Amortization Including Discontinued Operations Depreciation ​depletion ​and ​amortization including discontinued operations. Amortization of Borrowings in Equal Quarterly Installments Amortization of Borrowings in Equal quarterly installments Amortization of borrowings in equal quarterly installments Variable Rate [Domain] Intangible Asset, Finite-Lived, Accumulated Amortization Accumulated amortization Linerboard. Linerboard [Member] Percentage of denominated forecasted expenses, net of revenues under contracts. Percentage Of Denominated Forecasted Expenses Net Of Revenues Under Contracts Percentage of forecasted net exposures under contracts Related Party Transactions [Abstract] Income Tax, Policy [Policy Text Block] Income Taxes Disclosure Subsequent Events [Text Block] Subsequent Event Long-Term Debt Long-Term Debt [Text Block] Impact of foreign exchange on cash Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations, Total Service cost Defined Benefit Plan Service Cost Secured By Letters Of Credit [Member] Standby Letters of Credit [Member] Fair Value Hierarchy and NAV Fair Value By Fair Value Hierarchy Level [Axis] Schedule Of Defined Benefit Plans Disclosures [Table] Schedule Of Defined Benefit Plans Disclosures [Table] Asset conversion costs (NOTE 10) Asset Conversion Charges Asset conversion charges Environmental Remediation Obligations [Abstract] Co-tenant. Co-tenant [Member] Co-tenant [Member] Wood [Member] Wood [Member] Wood. Anti-dumping Duties [Member] Anti-dumping Duties [Member] Anti-dumping Duties [Member] Base Rate [Member] Operating lease liabilities due within one year Lease liabilities due within one year Operating Lease Liability Current Number of Major Customer Number of Major Customer Number of customer Concentration Risk Type [Domain] Other Liabilities Disclosure [Abstract] Derivative [Line Items] Derivative [Line Items] Total liabilities and shareholders' equity Liabilities And Stockholders Equity Other Other Assets, Miscellaneous, Noncurrent Goodwill, Measurement Period Adjustment Purchase price accounting adjustment Intangible Asset, Finite-Lived, Class [Axis] Document Fiscal Period Focus Document Fiscal Period Focus Accumulated cash deposits paid Accumulated Cash Deposits Made On Softwood Lumber Exports Accumulated cash deposits made on softwood lumber exports. Components of Inventories Schedule Of Inventory Current Table [Text Block] Title and Position [Axis] Accumulated Other Comprehensive Income Loss [Line Items] Accumulated Other Comprehensive Income Loss [Line Items] Borrowings Line of Credit Facility, Current Borrowing Capacity Currency Currency [Axis] Letters of credit outstanding Letters of Credit Outstanding, Amount Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease [Abstract] Net derivative losses on cash flow hedges: Net derivative (losses) gains on cash flow hedges: Natural Gas Commodity Contracts Year Two Thousand Twenty Six [Member] Natural gas commodity contracts year Two Thousand Twenty Six. Natural Gas Commodity Contracts Year 2026 [Member] Owner. Owner [Member] Owner [Member] Intangible Asset, Finite-Lived, Useful Life Estimated useful lives (in years) Entity Current Reporting Status Entity Current Reporting Status Reduction of Workforce Reduction of workforce. Reduction of workforce Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Fair Value Inputs Level1 [Member] Investment Type Investment Type [Axis] Document Transition Report Document Transition Report Commitments And Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Expected return on plan assets Defined Benefit Plan Expected Return On Plan Assets Increase (Decrease) in Inventories, Total Inventories Increase Decrease In Inventories Accounting Standards Update [Domain] Goodwill and Other Intangible Assets [Table] Goodwill and Other Intangible Assets [Table]. Deferred government assistance Deferred Government Assistance Deferred government assistance. Current liabilities Liabilities Current [Abstract] Percentage of operating limit on retirement year. Percentage of Operating Limit on Retirement Year Percentage of operating limit on retirement year Pension and Other Postretirement Benefits Cost (Reversal of Cost), Total Pension and Other Postretirement Benefits Cost (Reversal of Cost) Pension and other post-retirement costs Common Stock [Member] Common Stock Retirement Plan Type Retirement Plan Type [Axis] Accounting Standards Update [Axis] Credit Facility [Domain] Statistical Measurement Range [Member] Business Combination, Pro Forma Information [Table Text Block] Schedule of Pro Forma Sales and Net Loss Prepaid Expense, Current, Total Prepaid expenses Prepaid Expense Current Intangible Asset, Finite-Lived, before Accumulated Amortization Finite-Lived Intangible Assets, Gross, Total Definite-lived intangible assets subject to amortization, gross carrying amount Shareholders' equity Stockholders Equity [Abstract] Assets Assets [Abstract] Entity Central Index Key Entity Central Index Key Closure and restructuring costs (NOTE 10) Restructuring Charges, Total Restructuring Charges Cost Reduction Measures [Member] Cost reduction measures. Cost Reduction Measures [Member] Consolidation Items Consolidation Items [Axis] Current Fiscal Year End Date Current Fiscal Year End Date Derivative [Table] Derivative [Table] Other than Temporary Impairment Losses, Investments Write-off of investment Document Quarterly Report Document Quarterly Report Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Five 2031 Debt Instrument, Maturity Date Debt instrument maturity date Forest Products Mauricie [Member] Forest Products Mauricie. Forest Products Mauricie [Member] Fair Value Inputs Level2 [Member] Fair Value, Inputs, Level 2 [Member] Communication Papers [Member] Communication Paper [Member] Communication paper. Business Combination [Abstract] Asset retirement obligations Asset Retirement Obligation Asset Retirement Obligation, Ending Balance Asset Retirement Obligation, Beginning Balance Asset Retirement Obligation, Total Net Cash Provided By Used In Operating Activities Cash flows provided from operating activities Entity Incorporation, State or Country Code Entity Incorporation State Country Code Net loss Net loss Net (loss) earnings Net (loss) earnings Segment Reporting, Factors Used to Identify Entity's Reportable Segments Segment Reporting, Factor Identifying Reportable Segment, Description Loss Contingency, Receivable, Additions Accretion Additional costs of recoveries received Commitments and Contingencies Commitments And Contingencies Disclosure [Text Block] Gain (Loss) on Disposition of Assets Gain (Loss) on Disposition of Assets, Total Gain on disposals of assets Net gains on disposals of assets Percentage Of Stock Ownership Sold Percentage of stock ownership sold. 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Services Accelerated depreciation Restructuring Reserve Accelerated Depreciation Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income [Member] Accumulated Other Comprehensive Loss Deferred income tax assets Deferred Income Tax Assets, Net Increase (Decrease) in Accounts Payable and Accrued Liabilities, Total Increase Decrease In Accounts Payable And Accrued Liabilities Trade and other payables, including related party Entity Addresses [Table] Inventories (NOTE 7) Total inventories Inventory Net Other comprehensive (loss) income (NOTE 12): Other Comprehensive Income Loss Net Of Tax Period Increase Decrease [Abstract] Accounts Receivable Amount Accounts receivable amount. Accounts receivable Concentration Risk Benchmark [Domain] Hedging Designation [Axis] Hedging Designation [Domain] Cash deposits paid. 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Entity Registrant Name Entity Registrant Name Current Income Tax Expense (Benefit), Total Current income tax expense (benefit) Current Income Tax Expense Benefit Hydro-Saguenay Impairment Costs, Quebec [Member] Hydro Saguenay Impairment Costs, Quebec [Member] Hydro-saguenay impairment costs, quebec. Accounting Policies [Abstract] Bank indebtedness Bank Overdrafts Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total Profit Loss Net loss Net (loss) earnings Number of mills sold. Number of Mills Sold Number of mills sold Selling, General and Administrative Expense, Total Selling, general and administrative Selling General And Administrative Expense Pension and other postretirement defined benefit plans remeasurement benefit obligation. Pension And Other Postretirement Defined Benefit Plans Remeasurement Benefit Obligation Pension plan remeasurement benefit obligation Quebec [Member] Quebec. Quebec [Member] Commitments And Contingencies [Line Items] Commitments And Contingencies [Line Items] Commitments and contingencies. Related party other receivables. Related Party Other Receivables Other receivables Intersegment Sales [Member] Intersegment Eliminations [Member] Ashdown Curtailment Arkansas Mill. Ashdown Curtailment Arkansas Mill [Member] Ashdown Curtailment, Arkansas Mill [Member] Loss Contingency Accrual, Loss (Reversal of Loss) Provision for liability Trade Names [Member] Trade Names [Member] Entity Address, Address Line One Entity Address Address Line1 Operating Lease Right-of-Use Assets [Member] Operating lease right-of-use assets. Sale of Businesses Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Natural Gas Commodity Contracts Year Two Thousand Twenty Five [Member] Natural gas commodity contracts year two thousand twenty five. Natural Gas Commodity Contracts Year 2025 [Member] Schedule Of Restructuring And Related Costs [Table] Schedule Of Restructuring And Related Costs [Table] All Currencies All Currencies [Domain] Total current assets Assets Current Current assets Income Tax Jurisdiction, Foreign [Member] Foreign Country [Member] Net periodic benefit cost Defined Benefit Plan Net Periodic Benefit Cost Segments Statement Business Segments [Axis] Deferred income taxes and tax uncertainties (NOTE 6) These amounts represent the deferred income tax (benefit) expense for both the continuing and discontinued operations. Deferred Income Tax Expense Benefit Including Discontinued Operations Supplemental cash flow information Supplemental Cash Flow Information [Abstract] Related Party Transactions Related Party Transactions Disclosure [Text Block] Deferred Income Tax Expense Benefit Deferred income tax expense (benefit) Deferred income tax expense (benefit) Entity Small Business Entity Small Business Other Commitments [Domain] Pension Plans Pension Plans [Member] Pension Plans Defined Benefit [Member] Credit Concentration Risk [Member] Catalyst Restructuring and Impairment Costs, British Columbia Mills [Member] Catalyst restructuring and impairment costs, British Columbia mills. Catalyst Restructuring and Impairment Costs, British Columbia Mills [Member] Long-term debt due within one year (NOTE 11) Long Term Debt And Capital Lease Obligations Current Less: Due within one year Long-Term Debt and Lease Obligation, Current, Total Accounts Receivable, after Allowance for Credit Loss, Current, Total Accounts Receivable Net Current Receivables, less allowances of $5 and $5 Consolidation Items Consolidation Items [Domain] Espanola, ontario mill. Espanola, Ontario Mill [Member] Espanola, Ontario mill [Member] Components of Long-Term Debt Schedule Of Debt Instruments [Text Block] Restructuring And Related Activities [Abstract] Plan contributions Defined Benefit Plan Contributions By Employer Other Commitments [Axis] Idling of Coosa Pines Alabama Mill [Member] Idling of Coosa Pines, Alabama mill. Indemnification Guarantee [Member] Indemnification Agreement [Member] Curtailment triggered terminatio Pension plans Curtailment triggered termination number of pension plans Curtailment Triggered Termination Number Of Pension Plans Other Operating Income Expense Net Loss on disposal Other operating (income) loss, net Proceeds from Divestiture of Businesses, Net of Cash Divested, Total Proceeds from Divestiture of Businesses, Net of Cash Divested Proceeds from sale of businesses, net of cash disposed Surety bonds outstanding Malpractice Loss Contingency, Letters of Credit and Surety Bonds Subsequent Event Type [Axis] Curtailment, arkansas mill. Curtailment, Arkansas Mill [Member] Curtailment, Arkansas Mill [Member] Equity [Abstract] Product and Service Products And Services [Domain] Receivables, allowances Allowance For Doubtful Accounts Receivable Current Market Pulp [Member] Market Pulp Product [Member] Market pulp product. Financing activities Net Cash Provided By Used In Financing Activities [Abstract] Goodwill and other intangible assets, net (NOTE 8) Intangible Asset, Including Goodwill, after Accumulated Amortization Intangible Assets, Net (Including Goodwill), Total Goodwill and Other Intangible Assets [Line Items] Goodwill and Other Intangible Assets [Line Items]. Consolidated Entities [Axis] Catalyst british columbia mills. Catalyst British Columbia Mills [Member] Catalyst British Columbia Mills [Member] Entity Tax Identification Number Entity Tax Identification Number Increase (Decrease) in Receivables, Total Increase Decrease In Receivables Receivables, including related party Accounts Receivable [Member] Insurance Claims [Member] Derivative Instrument Derivative Instrument Risk [Axis] Equity Component Equity Component [Domain] Entity Address, City or Town Entity Address City Or Town Business Acquisition Business Combination [Axis] Income Taxes Paid, Net, Total Income taxes Income Taxes Paid Net Tax payments, net of tax refunds Tax refunds, net of income tax payments Tax refunds, net of income tax payments Restricted Cash, Noncurrent Restricted cash Restricted cash included in Other assets Segments Segment [Domain] Newsprint [Member] Newsprint [Member] Newsprint. Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Concentration Risk Type [Axis] Inventory Write-down Write-off inventory Impairment of inventory (NOTE 10) Countervailing duty and Anti-dumping duty cash deposits on softwood lumber paid Countervailing Duty and Anti Dumping Duty Cash Deposits on Softwood Lumber Paid Countervailing duty and anti dumping duty cash deposits on softwood lumber paid. Derivatives and Hedging Activities and Fair Value Measurement Derivatives And Fair Value [Text Block] Entity Entity [Domain] Goodwill and Other Intangible Assets Intangible Asset and Goodwill [Text Block] Total Assets Derivative Fair Value Of Derivative Asset Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax Amortization of net actuarial gain Pension expense Pension Expense Statement [Table] Statement [Table] Natural Gas Swap Contracts Natural Gas Swap Contracts [Member] Natural Gas Swap Contracts [Member] Natural gas swap contracts. Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest Earnings (loss) before income taxes (Loss) earnings before income taxes Loss before income taxes Entity Shell Company Entity Shell Company Remaining balance payable including accrued interest Trade and other payables Accounts Payable And Other Accrued Liabilities Current Cash flows used for investing activities Net Cash Provided By Used In Investing Activities Pension and other post-retirement benefit obligations (NOTE 5) Pension and post-retirement benefit obligations Liability, Defined Benefit Plan, Noncurrent Liability, Defined Benefit Plan, Noncurrent, Total Statement [Line Items] Statement [Line Items] Idling of espanola, ontario mill. Idling Of Espanola, Ontario Mill [Member] Idling of Espanola, Ontario mill [Member] Maximum [Member] Maximum [Member] Components of Other Assets Schedule of Other Assets [Table Text Block] Debt Disclosure [Abstract] Disposal Groups, Including Discontinued Operations [Table] Future Accounting Changes [Member] New Accounting Pronouncements [Member] New Accounting Pronouncements [Member] Business Acquisition, Acquiree Business Acquisition Acquiree [Domain] Concentration Risk Benchmark [Axis] Address Type [Domain] Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect Net increase in cash, cash equivalents and restricted cash Subsequent Events [Abstract] Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Purchases from related party Related Party Transaction, Purchases from Related Party Asset Class [Axis] Foreign Exchange Forward Contracts Foreign Exchange Forward [Member] Restructuring Cost And Reserve [Line Items] Restructuring Cost And Reserve [Line Items] Current assets Assets Current [Abstract] British Columbia Mills [Member] British Columbia mills. British Columbia Mills [Member] Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax, Total Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Change in unrecognized gains and prior service cost related to pension and other post-retirement benefit plans, net of tax Change in unrecognized gain and prior service cost related to pension and post-retirement benefit plans, net of tax of $xx Change in unrecognized gains (losses) and prior service cost related to pension and other post-retirement benefit plans, net of tax Cash consideration for sale of business Sale of Stock, Consideration Received on Transaction Document Fiscal Year Focus Document Fiscal Year Focus Schedule of finite and infinite intangible assets. Schedule Of Finite And Infinite Intangible Assets Table [Text Block] Components of Intangible Assets Loss Contingency Net Cash Deposits Paid Recognized As Receivable Loss contingency net cash deposits paid recognized as receivable. Net cash deposits paid recognized as receivable Common Stock, Shares, Outstanding, Ending Balance Common Stock, Shares, Outstanding, Beginning Balance Common Stock, Shares outstanding Common Stock Shares Outstanding Restructuring Type [Axis] Number of major customers Number Of Major Customers Accounting For Ten Percent Or More Of Accounts Receivable Number of major customers accounting for ten percent or more of accounts receivable. Business Acquisition [Line Items] Business Combination [Line Items] Provision for environmental and asset retirement obligations noncurrent Provision for Environmental and Asset Retirement Obligations Noncurrent Provision for environmental and asset retirement obligations Forecast [Member] Operating lease liabilities Operating Lease Liability Noncurrent Non-service components of net periodic benefit cost (NOTE 5) Non-service components of net periodic benefit cost Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component Additional paid-in capital Additional Paid In Capital Common Stock Proceeds from Income Tax Refunds Tax refunds, net of income tax payments Total assets of the disposal group classified as held for sale on the Consolidated Balance Sheets Assets Of Disposal Group Including Discontinued Operation Current Assets held for sale (NOTE 3) Reduction in Annual Market Pulp Production Capacity Reduction in annual market pulp production capacity. Reduction in annual market pulp production capacity Entity Address, State or Province Entity Address State Or Province Designated as Hedging Instrument [Member] Operating lease right-of-use assets Operating leases right-of-use assets Operating Lease Right Of Use Asset Amendment Flag Amendment Flag Goodwill [Table Text Block] Carrying Value of Goodwill Partial wind-up deficit within plans Maximum Deficit From Partial Wind Up Of Pension Plans To Be Funded Maximum deficit from partial wind up of pension plans to be funded. Amortization of prior year service costs Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax Concentration risk, percentage Concentration Risk, Percentage Bank Term Loan [Member] Bank Term Loan. Debt Instrument [Axis] Debt Instrument Curtailment triggered by termination Curtailment triggered by termination other comprehensive income loss finalization of pension and non pension postretirement plan valuation before tax. Curtailment Triggered By Termination Other Comprehensive Income Loss Finalization Of Pension And Non Pension Postretirement Plan Valuation Before Tax Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Ending Balance Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Beginning Balance Total cash, cash equivalents, and restricted cash shown in the Consolidated Statements of Cash Flows City Area Code City Area Code Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax Settlement loss Environmental liabilities Accrual for Environmental Loss Contingencies Accrual for Environmental Loss Contingencies, Ending Balance Accrual for Environmental Loss Contingencies, Beginning Balance Accrual for Environmental Loss Contingencies, Total Proceeds from government assistance for property, plant and equipment Proceeds From Government Assistance For Property, Plant and Equipment Proceeds from government assistance for property, plant and equipment. 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SOFR Adjusted [Member] Pension Plans and Other Post-Retirement Benefit Plans Pension And Other Postretirement Benefits Disclosure [Text Block] Common stock, par value Common Stock Par Or Stated Value Per Share Legal Entity Legal Entity [Axis] Schedule Of Cash Deposit Rate On Account Of Countervailing And Anti-dumping Duties [Table Text Block] Schedule Of Cash Deposit Rate On Account Of Countervailing And Anti-dumping Duties [Table Text Block] Cash Deposit Rates on Account of Countervailing and Anti-dumping Duties Other Address [Member] Other Address Wood products. Wood Products [Member] Total current liabilities Liabilities Current Current liabilities Other Liabilities Disclosure [Text Block] Other Liabilities and Deferred Credits Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] Cash, cash equivalents and restricted cash at end of period Cash, cash equivalents and restricted cash at beginning of period Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations, Total Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations Pulp and tissue. Pulp and Tissue [Member] Commitments And Contingencies [Table] Commitments And Contingencies [Table] Commitments and contingencies. Segment Disclosures Segment Reporting [Text Block] Derivative Instruments And Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Long-lived assets impairment charges Impairment of Long-Lived Assets to be Disposed of Geographical [Axis] Pension asset - defined benefit pension plans Pension and post-retirement benefit plans, assets Assets for Plan Benefits, Defined Benefit Plan Entity Emerging Growth Company Entity Emerging Growth Company Additional Paid-in Capital Additional Paid In Capital [Member] Approximate total response costs identified in the notice of liability. Approximate Total Response Costs Identified In The Notice Of Liability Approximate total response costs identified in the notice of liability Other liabilities and deferred credits (NOTE 13) Remaining balance payable including accrued interest Other Liabilities Noncurrent Other liabilites and deferred credits Income and other taxes Increase Decrease In Income Taxes Schedule Of Business Acquisitions By Acquisition [Table] Schedule Of Business Acquisitions By Acquisition [Table] Cover [Abstract] Gains Losses On Assets Held For Sale, Net Gains losses on assets held for sale, net Gain from sale Interest expense Defined Benefit Plan Interest Cost Specialty and Packaging Papers [Member] Specialty And Packaging Paper [Member] Specialty and packaging paper. Income Tax Contingency [Table] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Schedule of change in duties receivable of countervailing and anti-dumping duties. 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