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SUPPLEMENTAL FINANCIAL STATEMENT INFORMATION - Schedule of Inventories (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Disclosure Text Block Supplement [Abstract] |  |
Raw materials | $ 480 | $ 160
Finished pulp, paper and packaging | 909 | 767
Operating supplies | 653 | 529
Other | 137 | 30
Total | $ 2,179 | 1,486
Percentage of LIFO Inventory | 58.00% |
Inventory, LIFO reserve | $ 306 | $ 272

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