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Inventory (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Inventory Disclosure [Abstract] |  |
Fuel oil | $ 73 | $ 74
Coal | 93 | 97
Natural gas | 21 | 28
Spare parts | 196 | 213
Total Inventory | $ 383 | $ 412

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