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Stock-Based Compensation - Supplemental Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Stock-Based Compensation |  |  |
Minimum tax withholdings | $ 9 | $ 27 | $ 36
Compensation Expense | 27 | 27 | 32
Tax detriment/(benefit) recognized | 2 | (9) | (12)
Unrecognized Total Cost | 41 |  |
RSUs |  |  |
Stock-Based Compensation |  |  |
Compensation Expense | 9 | 9 | 9
Unrecognized Total Cost | $ 16 |  |
Weighted Average Recognition Period Remaining (In years) | 1 year 9 months 18 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 |  |
RPSUs |  |  |
Stock-Based Compensation |  |  |
Compensation Expense | $ 9 | 10 | 10
Unrecognized Total Cost | $ 15 |  |
Weighted Average Recognition Period Remaining (In years) | 1 year 2 months 8 days |  |
Award vesting period | 3 years |  |
PRSUs |  |  |
Stock-Based Compensation |  |  |
Compensation Expense | $ 7 | $ 6 | $ 11
Unrecognized Total Cost | $ 10 |  |
Weighted Average Recognition Period Remaining (In years) | 1 year 6 months 7 days |  |
Award vesting period | 3 years |  |

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