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Inventory (Tables) | 12 Months Ended
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Dec. 31, 2020
Inventory Disclosure [Abstract] |
Inventory Balance By Type | The following table summarizes the Company's inventory balances as of the dates indicated (in millions):
December 31, |  | 2020 |  | 2019
Fuel and other raw materials |  | $ | 223 |  |  | $ | 230 |
Spare parts and supplies |  | 238 |  |  | 257 |
Total |  | $ | 461 |  |  | $ | 487 |

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