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Inventory (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Inventory Disclosure [Abstract] |  |
Coal | $ 67 | $ 92
Oil products | 54 | 65
Fuel inventory for electric generation | 121 | 157
Materials and supplies, net | 100 | 88
Environmental products | 3 | 57
Inventory, net | $ 224 | $ 302

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