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Exit Activities and Discontinued Operations - Schedule of Retention Benefit Liability Roll Forward (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Restructuring Reserve [Roll Forward] |  |  |  |  |
Other current liabilities | $ 181 |  | $ 181 |  | $ 156
Retention Benefits |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Retention benefit liability at beginning of period |  |  | 14 | $ 11 |
Costs deferred as a regulatory asset | 2 | $ 2 | 3 | 4 |
Retention benefit liability at the end of the period | 17 | 15 | 17 | 15 |
Other current liabilities | $ 6 | $ 5 | $ 6 | $ 5 |

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