SUPPLEMENTAL FINANCIAL STATEMENT INFORMATION - Schedule of Inventories (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
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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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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Amount by which inventory stated at last-in first-out (LIFO) is less than (in excess of) inventory stated at other inventory cost methods.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of products used directly or indirectly in the manufacturing or production process, which may or may not become part of the final product. May also include items used in the storage, presentation or transportation of physical goods.

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Amount, after of valuation reserves and allowances, of inventory, classified as other, expected to be sold, or consumed within one year or operating cycle, if longer.

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The percentage of LIFO (last in first out) inventory to total inventory as of the balance sheet date if other than 100 percent.

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