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Exit Activities and Discontinued Operations - Schedule of Retention Benefit Liability Roll Forward (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Restructuring Reserve [Roll Forward] |  |  |
Other current liabilities | $ 144 |  | $ 156
Retention Benefits | D.E. Karn Generating Complex |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Retention benefit liability at beginning of period | 14 | $ 11 |
Costs deferred as a regulatory asset | 1 | 2 |
Retention benefit liability at the end of the period | 15 | 13 |
Other current liabilities | $ 5 | $ 4 |

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