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Inventory (Tables) | 9 Months Ended
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Sep. 30, 2021
Inventory Disclosure [Abstract] |
Inventory Balance By Type | The following table summarizes the Company’s inventory balances as of the periods indicated (in millions):
| September 30, 2021 |  | December 31, 2020
Fuel and other raw materials | $ | 312 |  |  | $ | 223 |
Spare parts and supplies | 265 |  |  | 238 |
Total | $ | 577 |  |  | $ | 461 |

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