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SUPPLEMENTAL FINANCIAL STATEMENT INFORMATION (Tables) | 9 Months Ended
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Sep. 30, 2025
Disclosure Text Block Supplement [Abstract] |
Schedule of Accounts and Notes Receivable, Net | Accounts and Notes Receivable, Net
In millions | September 30, 2025 |  | December 31, 2024
Trade (less allowances of $70 and $30, respectively) | $ | 3,570 |  |  | $ | 2,150 |
Other | 535 |  |  | 252 |
Total | $ | 4,105 |  |  | $ | 2,402 |
Schedule of Inventories | Inventories
In millions | September 30, 2025 |  | December 31, 2024
Raw materials | $ | 480 |  |  | $ | 160 |
Finished pulp, paper and packaging | 909 |  |  | 767 |
Operating supplies | 653 |  |  | 529 |
Other | 137 |  |  | 30 |
Total | $ | 2,179 |  |  | $ | 1,486 |
The last-in, first-out inventory method is used to value most of International Paper's U.S. inventories. Approximately 58% of total raw materials and finished products inventories were valued using this method. The last-in, first-out inventory reserve was $306 million and $272 million at September 30, 2025 and December 31, 2024, respectively.
Schedule of Amounts Related to Interest | Amounts related to interest were as follows:
| Three Months Ended September 30, | Nine Months Ended September 30, |
In millions | 2025 |  | 2024 | 2025 |  | 2024 |
Interest expense | $ | 135 |  |  | $ | 107 |  | $ | 413 |  |  | $ | 324 |  |
Interest income | 50 |  |  | 55 |  | 136 |  |  | 168 |  |
Capitalized interest costs | 9 |  |  | 6 |  | 20 |  |  | 14 |  |

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