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Inventory (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
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Inventory Disclosure [Abstract] |  |  |  |
Fuel and other raw materials | $ 246 |  |  | $ 424
Spare parts and supplies | 347 |  |  | 288
Total | $ 593 | $ 646 | $ 661 | $ 712

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