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COMMITMENTS AND CONTINGENCIES Environmental Remediation Obligations (Details) € in Millions, $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 29, 2025 defendant | Oct. 11, 2024 USD ($) | Jul. 31, 2024 USD ($) | Jul. 31, 2024 EUR (€) | Apr. 30, 2019 producer | Mar. 31, 2016 USD ($) | Sep. 30, 2025 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2022 USD ($) | Sep. 30, 2025 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2019 EUR (€)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for asbestos and environmental claims, gross |  |  |  |  |  |  | $ 276 | $ 279 |  | $ 276 | $ 279 |  |  |  |
Liability for asbestos and environmental claims, net |  |  |  |  |  |  | 97 | 100 |  | $ 97 | 100 |  |  |  |
Secretariat of the Federal Revenue Bureau of Brazil |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Responsible party percentage |  |  |  |  |  |  |  |  |  | 60.00% |  |  |  |  |
Loss contingency accrual |  |  |  |  |  |  | 48 |  |  | $ 48 |  |  |  |  |
Income tax examination, estimate of possible loss |  | $ 255 |  |  |  |  |  |  |  | 389 |  |  |  |  |
Income tax examination, penalties and interest expense |  |  |  |  |  |  |  |  |  | $ 279 |  |  |  |  |
Responsible party percentage-Sylvamo |  |  |  |  |  |  |  |  |  | 40.00% |  |  |  |  |
Shared tax assessment payment |  |  |  |  |  |  | 300 |  |  | $ 300 |  |  |  |  |
Secretariat of the Federal Revenue Bureau of Brazil | Tax Year 2007-2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax examination, estimate of possible loss |  |  |  |  |  |  |  |  |  | 110 |  |  |  |  |
Artuso Pastry Foods Corp v. Packaging Corp. of America (N.D. Ill.) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, number of defendants | defendant | 12 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Italian Competition Authority |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, number of defendants | producer |  |  |  |  | 30 |  |  |  |  |  |  |  |  |  |
Loss contingency accrual |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 31 | € 29
Accrual for environmental loss contingencies, period decrease |  |  | $ 6 | € 6 |  |  |  |  |  |  |  |  |  |  |
Cass Lake, Minnesota |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrual for environmental loss contingencies |  |  |  |  |  |  | 47 | 48 |  | 47 | 48 |  |  |  |
Kalamazoo River Superfund Site |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, damages sought, value |  |  |  |  |  | $ 37 |  |  |  |  |  |  |  |  |
Liability for asbestos and environmental claims, net, period increase (decrease) |  |  |  |  |  |  | 7 | 27 | $ 27 |  |  |  |  |  |
Liability for asbestos and environmental claims, net |  |  |  |  |  |  | 27 | 29 |  | 27 | 29 |  |  |  |
Kalamazoo River Superfund Site | Georgia-Pacific Consumer Products LP, Fort James Corporation and Georgia Pacific LLC Cost Recovery Action |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, damages sought, value |  |  |  |  |  |  |  |  |  | 79 |  |  |  |  |
Loss Contingency, damages awarded, value |  |  |  |  |  |  |  |  |  | $ 50 |  |  |  |  |
Loss contingencies, share of damages |  |  |  |  |  |  |  |  |  | 15.00% |  |  |  |  |
San Jacinto River Superfund Site |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for asbestos and environmental claims, net |  |  |  |  |  |  | 97 | 98 |  | $ 97 | 98 |  |  |  |
Responsible party percentage |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |
San Jacinto River Superfund Site | Southern Impoundment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for asbestos and environmental claims, net, period increase (decrease) |  |  |  |  |  |  |  |  |  |  |  | $ 10 |  |  |
San Jacinto River Superfund Site | Northern impoundment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for asbestos and environmental claims, net, period increase (decrease) |  |  |  |  |  |  |  |  |  |  | 27 | $ 55 |  |  |
Versailles Pond |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for asbestos and environmental claims, net |  |  |  |  |  |  | $ 29 | $ 30 |  | $ 29 | $ 30 |  | $ 30 |  |

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