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Share-Based Compensation - Narrative (Details) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
May 05, 2020 USD ($) | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) vesting_period | Jun. 28, 2020 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common stock, shares authorized (in shares) | shares |  | 22,500,000 | 15,000,000 |  |
Share-based compensation expense | $ 18 |  |  |  |
Cash retention incentives capitalized to other current assets | 15 |  |  |  |
Difference between cash and cash retention incentives | $ 10 |  |  |  |
Restricted stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Aggregate intrinsic value, vested |  | $ 1 |  |  |
Share-based payment arrangement, option | Management |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  | 3 years | 3 years | 3 years |
Share-based payment arrangement, option | Management | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Options expiration |  | 7 years |  |  |
Share-based payment arrangement, option | Management | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Options expiration |  | 10 years |  |  |
Performance shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  | 3 years |  |  |
Share-based compensation expense |  | $ (4) | $ 10 | $ 12 |
Performance shares | 2018 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of vesting periods | vesting_period |  |  |  | 3 |
2014 Long Term Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common stock, reserved for future issuance (in shares) | shares |  | 474,123 |  |  |
2014 Long Term Incentive Plan | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common stock, shares authorized (in shares) | shares |  | 358,000 |  |  |
2021 Long Term Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common stock, reserved for future issuance (in shares) | shares |  |  |  |  | 6,800,000

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