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Inventory (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Inventory Disclosure [Abstract] |  |
Fuel oil | $ 8 | $ 8
Coal | 114 | 83
Natural gas | 385 | 206
Spare parts and finished goods | 244 | 201
Total Inventory | $ 751 | $ 498

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