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Inventory (Tables) | 6 Months Ended
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Jun. 30, 2018
Inventory Disclosure [Abstract] |
Inventory Balance By Type | The following table summarizes the Company’s inventory balances as of the periods indicated (in millions):
| June 30, 2018 |  | December 31, 2017
Fuel and other raw materials | $ | 293 |  |  | $ | 284 |
Spare parts and supplies | 290 |  |  | 278 |
Total | $ | 583 |  |  | $ | 562 |

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