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Share-Based Compensation - Narrative (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
May 05, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation expense | $ 18,000,000 |  |  |  |
Cash retention incentives capitalized to other current assets | 15,000,000 |  |  |  |
Difference between cash and cash retention incentives | $ 10,000,000 |  |  |  |
Participating securities |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Intrinsic value of restricted stock, vested |  |  |  | $ 1,000,000 |
Unrecognized compensation expense |  | $ 1,000,000 |  | $ 1,000,000 |
Share-based compensation expense, weighted average period for recognition |  |  |  | 1 year 1 month 20 days |
Stock option |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation expense |  | 0 |  | $ 0 |
Stock option | Management |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation, award vesting period |  |  |  | 3 years |
Stock option | Management | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expiration period |  |  |  | 7 years |
Stock option | Management | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expiration period |  |  |  | 10 years |
Performance Share Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation, award vesting period |  |  |  | 3 years |
Share-based compensation expense |  | $ 0 | $ 0 | $ (4,000,000) | $ 12,000,000
Cash Restricted Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation, award vesting period |  |  |  | 3 years |

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