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Inventories (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024
--- | --- | --- | ---
Inventories |  |  |
Finished goods | $ 747 | $ 745 | $ 999
Raw materials | 188 | 169 | 159
Operating supplies | 50 | 49 | 52
Inventories | $ 985 | $ 963 | $ 1,210

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