Divestitures and Impairments of Businesses (Narrative) (Details) € 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 ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 BRL (R$)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Issuance of Debt					$ 210,000,000	$ 144,000,000
Distribution to Sylvamo Corporation												$ 0	$ 130,000,000	$ 0
Net (gains) losses on sales and impairments of businesses												(76,000,000)	$ 358,000,000	$ (465,000,000)
Percentage of ownership retained							19.90%						19.90%
Related Party Transaction, Other Revenues from Transactions with Related Party												630,000,000	$ 185,000,000
Revolving Credit Facility [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revolving credit facilities available												$ 1,500,000,000
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%	3.00%	3.00%
Kwidzyn Mill [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Divestiture costs							$ 6,000,000
Net (gains) losses on sales and impairments of businesses								$ (350,000,000)	$ 0	$ 0
Olmuksan [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net (gains) losses on sales and impairments of businesses							0	0	$ (9,000,000)	$ 2,000,000
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	$ 794,000,000	€ 669.0
Net (gains) losses on sales and impairments of businesses								(404,000,000)
Net gains (losses) on sales and impairments of businesses, net of tax								350,000,000
Other comprehensive income (loss), foreign currency transaction and translation adjustment, before tax								(44,000,000)
Divestiture costs							9,000,000
Divestiture costs, net of taxes							6,000,000
Net (gains) losses on sales and impairments of businesses								360,000,000
Gain (Loss) on Sale of Assets and Asset Impairment Charges, net of tax								(394,000,000)
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								1,500,000,000
Distribution to Sylvamo Corporation							$ 130,000,000
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								450,000,000
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								520,000,000
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								100,000,000
Revolving credit facilities available								450,000,000
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								$ 450,000,000
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			$ 81,000,000	€ 66.0
Net (gains) losses on sales and impairments of businesses											$ 123,000,000		$ 4,000,000
Net gains (losses) on sales and impairments of businesses, net of tax											(123,000,000)		$ 2,000,000
Sale of Stock, Percentage of Ownership before Transaction			90.38%	90.38%
Assets, Fair Value Disclosure											$ 79,000,000			$ 79,000,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Brazilian Industrial Packaging
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Divestiture of Businesses														58,500,000	R$ 330,000,000
Proceeds to be received at closing														49,600,000	280,000,000
Deferred proceeds on disposal of business														$ 8,900,000	R$ 50,000,000
Number of containerboard mill to be sold														3	3
Number of box plants to be sold														4	4
Net (gains) losses on sales and impairments of businesses														$ 347,000,000
Net gains (losses) on sales and impairments of businesses, net of tax														(340,000,000)
Other comprehensive income (loss), foreign currency transaction and translation adjustment, before tax														327,000,000
Impairment of long-lived assets to be disposed of														$ 20,000,000