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Share-Based Compensation - Schedule of Share-based Compensation (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expenses | $ 4 | $ 17 | $ 16
Unrecognized Expense | 40 |  |
Incentive Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expenses | 3 | 12 | 4
Unrecognized Expense | $ 26 |  |
Weighted-Average Remaining Years | 2 years 10 months 24 days |  |
Phantom Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expenses | $ 1 | 5 | 8
Unrecognized Expense | $ 7 |  |
Weighted-Average Remaining Years | 2 years 9 months 18 days |  |
Performance awards | CEO Performance Award |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expenses | $ 0 | 0 | 2
Unrecognized Expense | $ 7 |  |
Weighted-Average Remaining Years | 1 year |  |
Performance awards | 2018 CEO Performance Award |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expenses | $ 0 | 0 | 2
Unrecognized Expense | $ 0 |  |
Weighted-Average Remaining Years | 0 years |  |
Performance awards | Former CEO Performance Award |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expenses | $ 0 | $ 0 | $ 0
Unrecognized Expense | $ 0 |  |
Weighted-Average Remaining Years | 0 years |  |

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