Commitments And Contingent Liabilities (Narrative) (Details) € in Millions, $ in Millions			3 Months Ended			12 Months Ended
	Jan. 16, 2024 USD ($)	Oct. 01, 2017 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2023 USD ($) Producers	Dec. 31, 2020 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2023 EUR (€)	Dec. 31, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2019 USD ($)
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies			$ 251.0	$ 243.0		$ 251.0
Liability for Asbestos and Environmental Claims, Net			$ 97.0	105.0		$ 97.0
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						$ 119.0
Income tax examination, penalties and interest Expense						393.0
Secretariat of the Federal Revenue Bureau of Brazil [Member] | Subsequent Event [Member]
Loss Contingencies [Line Items]
Income tax examination, penalties and interest Expense	$ 274.0
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	47.0		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			27.0	37.0		27.0
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			83.0	$ 95.0		$ 83.0
Responsible party percentage						50.00%
Versailles Pond
Loss Contingencies [Line Items]
Liability for Asbestos and Environmental Claims, Net			30.0			$ 30.0
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, 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