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Exit Activities and Discontinued Operations - Schedule of Retention Benefit Liability Roll Forward (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 24 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Dec. 31, 2020
Restructuring Reserve [Roll Forward] |  |  |  |  |
Other current liabilities | $ 183 | $ 183 |  | $ 183 | $ 133
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 | 11 | 16 |
Costs deferred as a regulatory asset | 1 | 5 | 0 |  |
Costs incurred and capitalized |  | 1 | 1 |  |
Retention benefit liability at the end of the period | 17 | 17 | 16 | 17 |
Other current liabilities | $ 5 | $ 5 | $ 7 | $ 5 |

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