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Asset Sale and Exit Activities - Schedule of Retention Benefit Liability Roll Forward (Details) - USD ($) $ in Millions | 12 Months Ended | 15 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020
Restructuring Reserve [Roll Forward] |  |  |
Other current liabilities | $ 156 | $ 186 | $ 156
Retention Benefits | D.E. Karn Generating Complex |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Retention benefit liability at beginning of period | 4 | 0 |
Costs incurred and charged to maintenance and other operating expenses | 13 | 3 | 16
Costs incurred and capitalized | 2 | 1 |
Costs paid or settled | (8) | 0 |
Retention benefit liability at the end of the period | 11 | 4 | 11
Other current liabilities | $ 3 | $ 2 | $ 3

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