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Inventory (Tables) | 3 Months Ended
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Mar. 31, 2019
Inventory Disclosure [Abstract] |
Inventory Balance By Type | The following table summarizes the Company’s inventory balances as of the periods indicated (in millions):
| March 31, 2019 |  | December 31, 2018
Fuel and other raw materials | $ | 310 |  |  | $ | 300 |
Spare parts and supplies | 269 |  |  | 277 |
Total | $ | 579 |  |  | $ | 577 |

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