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Exit Activities - Schedule of Retention Benefit Liability Roll Forward (Details) - USD ($) $ in Millions | 3 Months Ended | 18 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Dec. 31, 2020
Restructuring Reserve [Roll Forward] |  |  |  |
Other current liabilities | $ 155 |  | $ 155 | $ 156
Retention Benefits | D.E. Karn Generating Complex |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Retention benefit liability at beginning of period | 11 | $ 4 |  |
Costs incurred and charged to maintenance and other operating expenses | 0 | 4 | 16 |
Costs deferred as a regulatory asset | 2 | 0 |  |
Retention benefit liability at the end of the period | 13 | 8 | 13 |
Other current liabilities | $ 4 | $ 4 | $ 4 |

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