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Stock-Based Compensation - Supplemental Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Stock-Based Compensation |  |  |
Minimum tax withholdings | $ 36 | $ 19 | $ 5
Compensation Expense | 32 | 41 | 38
Tax detriment recognized | (12) | (4) | (5)
Unrecognized Total Cost | 27 |  |
GenOn |  |  |
Stock-Based Compensation |  |  |
Compensation Expense |  | 1 | 6
RSUs |  |  |
Stock-Based Compensation |  |  |
Compensation Expense | 9 | 12 | 15
Unrecognized Total Cost | $ 8 |  |
Weighted Average Recognition Period Remaining (In years) | 1 year 21 days |  |
Award vesting period | 3 years |  |
DSUs |  |  |
Stock-Based Compensation |  |  |
Compensation Expense | $ 2 | 2 | 2
Unrecognized Total Cost | $ 0 |  |
Weighted Average Recognition Period Remaining (In years) | 0 years |  |
MSUs |  |  |
Stock-Based Compensation |  |  |
Compensation Expense | $ 0 | 4 | 5
Unrecognized Total Cost | $ 0 |  |
Weighted Average Recognition Period Remaining (In years) | 6 months |  |
RPSUs |  |  |
Stock-Based Compensation |  |  |
Compensation Expense | $ 10 | 7 | 3
Unrecognized Total Cost | $ 9 |  |
Weighted Average Recognition Period Remaining (In years) | 8 months 15 days |  |
Award vesting period | 3 years |  |
PRSUs |  |  |
Stock-Based Compensation |  |  |
Compensation Expense | $ 11 | $ 16 | $ 13
Unrecognized Total Cost | $ 10 |  |
Weighted Average Recognition Period Remaining (In years) | 1 year 18 days |  |
Award vesting period | 3 years |  |

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