Commitments And Contingent Liabilities (Narrative) (Details) € in Millions, $ in Millions		3 Months Ended		12 Months Ended
	Oct. 01, 2017 USD ($)	Dec. 31, 2022 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2022 USD ($) Producers	Dec. 31, 2020 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2022 EUR (€)	Dec. 31, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2019 USD ($)
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies		$ 243.0		$ 243.0
Accrual for environmental loss contingencies, gross		251.0		251.0
Liability for Asbestos and Environmental Claims, Net		$ 105.0		$ 105.0
Increase (Decrease) in Income Taxes Receivable			$ 70.0
Income Taxes Receivable									$ 48.0
Value Added Tax Receivable			81.0							$ 11.0
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]		Other Accrued Liabilities, Current		Other Accrued Liabilities, Current				Other Accrued Liabilities, Current
Secretariat of the Federal Revenue Bureau of Brazil [Member]
Loss Contingencies [Line Items]
Loss contingency accrual		$ 48.0		$ 48.0
Responsible party percentage				60.00%
Shared Tax Assessment Payment		300.0		$ 300.0
Responsible party percentage-Sylvamo				40.00%
Income tax examination, estimate of possible loss				$ 111.0
Income tax examination, penalties and interest Expense				361.0
Discontinued Operations
Loss Contingencies [Line Items]
Other Income			42.0
Interest Income
Loss Contingencies [Line Items]
Other Income			$ 28.0
Cass Lake Minnesota [Member]
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies		46.0		46.0
Kalamazoo River Superfund Site [Member]
Loss Contingencies [Line Items]
Loss contingency, damages sought, value						$ 37.0	$ 19.0
Proposed consent decree, value of remediation payments											$ 100.0
Proposed consent decree, value of labor performed											$ 136.0
Liability for Asbestos and Environmental Claims, Net		37.0		37.0					13.0
Liability for Asbestos and Environmental Claims, Net, Period Increase (Decrease)				27.0
San Jacinto River Superfund Site [Member]
Loss Contingencies [Line Items]
Loss contingency, damages sought, value	$ 115.0
Liability for Asbestos and Environmental Claims, Net		95.0		$ 95.0					$ 60.0
Responsible party percentage				50.00%
Georgia-Pacific Consumer Products LP, Fort James Corporation and Georgia Pacific LLC Cost Recovery Action [Member] | Kalamazoo River Superfund Site [Member]
Loss Contingencies [Line Items]
Loss contingency, damages sought, value				$ 79.0
Loss contingency, damages awarded, value				$ 50.0
Loss Contingencies, share of damages				15.00%
Italian Competition Authority [Member]
Loss Contingencies [Line Items]
Loss contingency, number of defendants | Producers				30
Loss contingency accrual		31.0		$ 31.0				€ 29
Northern Impoundment [Member] | San Jacinto River Superfund Site [Member]
Loss Contingencies [Line Items]
Loss contingency, damages sought, value	105.0
Liability for Asbestos and Environmental Claims, Net		25.0		$ 25.0
Liability for Asbestos and Environmental Claims, Net, Period Increase (Decrease)		$ 21.0			$ 55.0
Southern Impoundment [Member] | San Jacinto River Superfund Site [Member]
Loss Contingencies [Line Items]
Loss contingency, damages sought, value	$ 10.0
Liability for Asbestos and Environmental Claims, Net, Period Increase (Decrease)					$ 10.0