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Inventory (Tables) | 12 Months Ended
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Dec. 31, 2018
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, |  | 2018 |  | 2017
Fuel and other raw materials |  | $ | 300 |  |  | $ | 284 |
Spare parts and supplies |  | 277 |  |  | 278 |
Total |  | $ | 577 |  |  | $ | 562 |

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