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Asset Sale and Exit Activities - Schedule of Retention Benefit Liability Roll Forward (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2020 | Dec. 31, 2019
Restructuring Reserve [Roll Forward] |  |  |  |
Other current liabilities | $ 193 | $ 193 | $ 193 | $ 186
Retention Benefits | D.E. Karn Generating Complex |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Retention benefit liability at beginning of period |  | 4 |  |
Costs incurred and charged to maintenance and other operating expenses | 4 | 11 | 14 |
Costs incurred and capitalized |  | 1 |  |
Retention benefit liability at the end of the period | 16 | 16 | 16 |
Other current liabilities | $ 7 | $ 7 | $ 7 |

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