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Net gains (losses) on sales and impairments of businesses, net of tax

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Tax Benefit on Exchange of Sylvamo Shares

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of gain (loss) from the difference between the sale price or salvage price and the book value of an asset that was sold or retired, and gain (loss) from the write down of assets from their carrying value to fair value.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount before tax, after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Percentage of subsidiary's or equity investee's stock owned by parent company after stock transaction.

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Divestitures and Impairments of Businesses (Narrative) (Details) € in Millions, $ in Millions					3 Months Ended					12 Months Ended
	Aug. 06, 2021 USD ($)	Aug. 06, 2021 EUR (€)	May 31, 2021 USD ($)	May 31, 2021 EUR (€)	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Issuance of Debt					$ 210.0
Revolving credit facilities available										$ 1,900.0
Distribution to Sylvamo Corporation										0.0	$ 0.0	$ 130.0
Related Party Transaction, Amounts of Transaction											630.0	185.0
Net (gains) losses on sales and impairments of businesses										0.0	(76.0)	358.0
Percentage of ownership retained							19.90%
Proceeds from exchange of equity securities										0.0	311.0	0.0
Tax Benefit on Exchange of Sylvamo Shares										0.0	(56.0)	$ 0.0
Sylvamo Corporation Investment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Aggregate Units Exchanged - Sylvamo Corporation Investment					4,614,358,000,000	4,132,000,000,000
Proceeds from exchange of equity securities					$ 167.0	$ 144.0
Notes Reduction						144.0
Tax Benefit on Exchange of Sylvamo Shares					$ 35.0	$ 31.0
Revolving Credit Facility [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revolving credit facilities available										$ 1,400.0	$ 1,500.0
Minimum [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Debt instrument, interest rate, stated percentage							3.00%				3.00%	3.00%
Discontinued Operations, Held-for-sale or Disposed of by Sale \| Kwidzyn Mill [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Divestiture of Businesses	$ 794.0	€ 669.0
Net (gains) losses on sales and impairments of businesses								$ (404.0)
Net gains (losses) on sales and impairments of businesses, net of tax								350.0
Other comprehensive income (loss), foreign currency transaction and translation adjustment, before tax								(44.0)
Divestiture costs							$ 9.0
Divestiture costs, net of taxes							6.0
Net (gains) losses on sales and impairments of businesses								360.0
Gain (Loss) on Sale of Assets and Asset Impairment Charges, net of tax								(394.0)
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff [Member] \| Printing Papers [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Issuance of Debt								1,500.0
Distribution to Sylvamo Corporation							$ 130.0
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff [Member] \| Printing Papers [Member] \| Term Loan "B" Facility [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Issuance of Debt								450.0
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff [Member] \| Printing Papers [Member] \| Term Loan "F" Facility [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Issuance of Debt								520.0
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff [Member] \| Printing Papers [Member] \| Revolving Credit Facility [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Lines of Credit								100.0
Revolving credit facilities available								450.0
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff [Member] \| Printing Papers [Member] \| Unsecured Debt [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Issuance of Debt								$ 450.0
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff [Member] \| Printing Papers [Member] \| Minimum [Member] \| Unsecured Debt [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Debt instrument, interest rate, stated percentage								7.00%
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Olmuksan [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Divestiture of Businesses			$ 81.0	€ 66.0
Net (gains) losses on sales and impairments of businesses									$ 123.0			$ 4.0
Net gains (losses) on sales and impairments of businesses, net of tax									(123.0)			$ 2.0
Sale of Stock, Percentage of Ownership before Transaction			90.38%	90.38%
Assets, Fair Value Disclosure									$ 79.0