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[Member] 400 Million Senior Notes Due 2030 Secretariat of the Federal Revenue Bureau of Brazil Secretariat of the Federal Revenue Bureau of Brazil [Member] Supplier Finance Program Obligations Supplier Finance Program [Text Block] Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Consolidation Items [Domain] Consolidation Items [Domain] Pension and other postretirement funding more than cost Pension Funding More (Less) Than Cost Pension Funding More (Less) Than Cost Schedule of Property, Plant and Equipment Property, Plant, and Equipment [Table Text Block] Statement of Comprehensive Income [Abstract] Earnings Per Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Earnings Per Share [Abstract] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Document Fiscal Period Focus (i.e. Q1,Q2,Q3,FY) Document Fiscal Period Focus €230 million 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Litigation, Total Number of Companies Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Dividends per share, declared (USD per share) Common Stock, Dividends, Per Share, Declared Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Service cost Defined Benefit Plan, Service Cost Proceeds from corporate owned life insurance Proceeds from Life Insurance Policy Total debt, excluding fair value adjustments, bond discounts and debt issuance costs Debt And Lease Obligation, Gross, Excluding Debt Issuance Costs Debt And Lease Obligation, Gross, Excluding Debt Issuance Costs $850 million senior green notes due 2035 850 Million Senior Green Notes Due 2035 [Member] 850 Million Senior Green Notes Due 2035 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[Table] Disaggregation of Revenue [Table] Restructuring reserve, current Restructuring Reserve, Current Entity Interactive Data Current Entity Interactive Data Current Net loss (income) attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Deferred tax liabilities Deferred Income Tax Liabilities, Net Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Entity Small Business Entity Small Business Comprehensive income attributable to common shareholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent Termination Date Trading Arrangement Termination Date Property, Plant, and Equipment [Line Items] Property, Plant, and Equipment [Line Items] Subsequent Events [Abstract] Description of Business and Summary of Significant Accounting Policies Business Description and Accounting Policies [Text Block] 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Noncurrent Financing activities: Cash Provided by (Used in) Financing Activity, Continuing Operation [Abstract] Document Type Document Type Cash paid for purchase of businesses, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Impairment of other assets Other Asset Impairment Charges Fair Value as of Grant Date Award Grant Date Fair Value Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Foreign currency translation gain Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Arrangement Duration Trading Arrangement Duration Subsequent Event [Line Items] Subsequent Event [Line Items] Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Receivables sold to the financial institutions and derecognized Receivables Sold To The Financial Institutions And Derecognized, Accounts Receivable Receivables Sold To The Financial Institutions And 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from employees Stock Issued During Period, Value, Employee Trust, Net Of Tax Paid Stock Issued During Period, Value, Employee Trust, Net Of Tax Paid Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] $1,000 million senior green notes due 2054 1000 Million Senior Green Notes Due 2054 [Member] 1000 Million Senior Green Notes Due 2054 Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Share-based compensation expense Allocated Share Based Compensation Expense, Including Social Charges Allocated Share Based Compensation Expense, Including Social Charges Executive Category: Executive Category [Axis] Other comprehensive income (loss) attributable to common shareholders, tax Other Comprehensive Income (Loss), Tax Liabilities and Equity Liabilities and Equity [Abstract] Inventories Inventories Inventories Inventory, Net All Award Types Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Fair Value Measurement Fair Value Disclosures [Text Block] Variable Interest Entity [Table] Variable Interest Entity [Table] Asset pledged as collateral Asset Pledged as Collateral [Member] Unrecognized tax benefits, reduction resulting from lapse of applicable statute of limitations Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations PEO Name PEO Name Accrued liabilities and other Increase (Decrease) in Accrued Liabilities Schedule Restructuring Costs and Asset Impairment Charges Restructuring Costs and Asset Impairment Charges [Table Text Block] Restructuring Costs and Asset Impairment Charges Pension and other postretirement non-service income, net Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component Cash Flow Hedges Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Other debt additions (repayments), net Proceeds from (Repayments of) Other Debt Long-Lived Asset, Class [Axis] Long-Lived Asset, Class [Axis] Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Transfers accounted for as secured borrowings, carrying amount Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount Debt with fixed interest rates Long-Term Debt, Percentage Bearing Fixed Interest, Amount $150 million senior notes due 2047 150 Million Senior Notes Due 2047 [Member] 150 Million Senior Notes Due 2047 Issuance of common stock net of tax paid in connection with shares withheld from employees (in shares) Restricted Stock, Shares Issued Net of Shares for Tax Withholdings Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Re-issuance of shares by Smurfit Kappa Employee Trust Stock Issued During Period, Value, 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net of depletion Forestlands, Net of Depletion [Member] Forestlands, Net of Depletion Schedule of Individual Components of Debt Schedule of Debt [Table Text Block] Schedule of Inventory Schedule of Inventory, Current [Table Text Block] Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] Basic earnings (loss) per share attributable to common shareholders (in dollars per share) Basic earnings (loss) per share attributable to common shareholders (in dollars per share) Earnings Per Share, Basic Contract assets and liabilities, contract liabilities (short-term) Contract with Customer, Liability, Current Total current assets Assets, Current Insider Trading Arrangements [Line Items] $300 million senior notes due 2031 300 Million Senior Notes Due 2031 [Member] 300 Million Senior Notes Due 2031 Award Type Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Interest Income (Expense), Nonoperating [Abstract] Accounts receivable, net 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Assets Accounted for as Sales [Table Text Block] Cash paid for interest, net of interest received Cash Paid For Interest, Net of Interest Received Cash Paid For Interest, Net of Interest Received Other expense, net Other expense, net Other Nonoperating Income (Expense) Total Shareholders' Equity Parent [Member] Name Awards Close in Time to MNPI Disclosures, Individual Name Entity Address, Country Entity Address, Country Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Non-current assets: Assets, Noncurrent [Abstract] Property, Plant and Equipment Property, Plant and Equipment [Member] Long-Lived Asset, Class [Domain] Long-Lived Asset, Class [Domain] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Property, Plant, and Equipment [Table] Property, Plant, and Equipment [Table] Preferred stock, $0.001 par value; 500,000,000 shares authorized; 10,000 shares outstanding Preferred Stock, Value, Issued 700 Million Receivables Securitization Due 2027 700 Million Receivables Securitization Due 2027 [Member] 700 Million Receivables Securitization Due 2027 Adjustment to Compensation: Adjustment to Compensation [Axis] Reclassification from AOCI Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Number of lawsuits Loss Contingency, Pending Claims, Number Segment Adjusted EBITDA Adjusted Earnings Before Interest Tax Depreciation And Amortization Adjusted Earnings Before Interest Tax Depreciation And Amortization Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Capital expenditures Payments to Acquire Productive Assets Statement of Cash Flows [Abstract] Foreign currency translation gain Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member] Credit Facility [Axis] Credit Facility [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Non-current debt due after one year (amounts related to consolidated variable interest entities of $366 million and $376 million at June 30, 2026 and December 31, 2025, respectively) Non-current debt due after one year Long-Term Debt and Lease Obligation Name Measure Name Income Taxes Income Tax Disclosure [Text Block] Accounts payable Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] €500 million senior green notes due 2033 500 Million Senior Green Notes Due 2033 [Member] 500 Million Senior Green Notes Due 2033 $1,000 million senior green notes due 2034 1000 Million Senior Green Notes Due 2034 [Member] 1000 Million Senior Green Notes Due 2034 Debt Instrument [Line Items] Debt Instrument [Line Items] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Capital in Excess of Par Value Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Restructuring Costs and Asset Impairment Charges [Abstract] Restructuring Costs and Asset Impairment Charges [Abstract] Less: Accumulated depreciation and impairment Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, Accumulated Depreciation and Impairment Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, Accumulated Depreciation and Impairment Name Trading Arrangement, Individual Name $600 million senior notes due 2028 600 Million Senior Notes Due 2028 [Member] 600 Million Senior Notes Due 2028 Cash and cash equivalents (amounts related to consolidated variable interest entities of $1 million and $3 million at June 30, 2026 and December 31, 2025, respectively) Cash and cash equivalents Cash and Cash Equivalent Retirement Plan Sponsor Location [Axis] Retirement Plan Sponsor Location [Axis] Raw materials Inventory, Raw Materials, Net of Reserves Common stock shares issued not disclosed (in shares) CommonStockSharesIssuedNotDisclosed CommonStockSharesIssuedNotDisclosed Company Selected Measure Amount Company Selected Measure Amount Schedule of Reconciliation of Operating Profit (Loss) from Segments to Consolidated Segment Reporting, Reconciliation of Profit (Loss) by Segment to Consolidated [Table Text Block] Depreciation, depletion and amortization Depreciation, depletion and amortization Depreciation, Depletion and Amortization Retirement Plan Sponsor Location [Domain] Retirement Plan Sponsor Location [Domain] Net income (loss) Net income (loss) Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest $600 million senior notes due 2033 600 Million Senior Notes Due 2033 [Member] 600 Million Senior Notes Due 2033 Current assets: Assets, Current [Abstract] €500 million senior green notes due 2029 500 Million Senior Green Notes Due 2029 [Member] 500 Million Senior Green Notes Due 2029 Non-PEO NEO Non-PEO NEO [Member] Senior notes Senior Notes [Member] Entity Address, Address Line One Entity Address, Address Line One Income tax expense Income Tax Expense (Benefit) Fine paid Loss Contingency Accrual, Payments Cost of goods sold Segment cost of goods sold Cost of Product and Service Sold Award Timing Method Award Timing Method [Text Block] Decrease in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Cash payments to financial institutions Cash (Payments To) Proceeds From Financial Institutions, Accounts Receivable Cash (Payments To) Proceeds From Financial Institutions, Accounts Receivable Variable interest entity, primary beneficiary Variable Interest Entity, Primary Beneficiary [Member] Net actuarial loss Defined Benefit Plan, Amortization of Gain (Loss) Net income (loss) attributable to common shareholders Net Income (Loss) Attributable to Parent Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Proceeds from sale of property, plant and equipment Proceeds from Sale of Property, Plant, and Equipment Statement [Table] Statement [Table] Losses at closed facilities Losses At Closed Facilities Losses At Closed Facilities Restatement Determination Date: Restatement Determination Date [Axis] Schedule of Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Interest income Investment Income, Interest Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Debt extension period Debt Instrument Term Extension Period Debt Instrument Term Extension Period €600 million senior green notes due 2032 600 Million Senior Green Notes Due 2032 [Member] 600 Million Senior Green Notes Due 2032 Damages sought Loss Contingency, Damages Sought, Value Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Numerator: Net Income (Loss) Available to Common Stockholders, Diluted [Abstract]