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Share-Based Compensation (Details) |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 01, 2017 USD ($) agreement trading_day $ / shares | Feb. 28, 2019 USD ($) | Dec. 31, 2020 USD ($) plan shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares or units available for future grants (in shares) | shares |  |  | 6,800,000 |  |
Total tax benefit recognized during the year related to compensation expense |  |  | $ 1,000,000 | $ 4,000,000 | $ 4,000,000
Cash paid to settle liability-classified awards upon vesting |  |  | $ 8,000,000 | 23,000,000 | 17,000,000
Number of defined-contribution 401(k) plans | plan |  |  | 2 |  |
Matching contribution, percent |  |  | 100.00% |  |
Percent of eligible compensation contributed by participants |  |  | 6.00% |  |
Vesting period |  |  | 3 years |  |
Matching contributions made by the company |  |  | $ 10,000,000 | $ 9,000,000 | 9,000,000
Share-Based Awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares right to receive cash payment on vesting equal to fair market value is received per award (in shares) | shares |  |  | 1 |  |
Vesting period |  |  | 3 years |  |
Share-Based Awards | Vesting Year One |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting percentage |  |  | 33.33% |  |
Share-Based Awards | Vesting Year Two |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting percentage |  |  | 33.33% |  |
Share-Based Awards | Vesting Year Three |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting percentage |  |  | 33.33% |  |
Performance awards | 2018 CEO Performance Award |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of performance award agreements entered into | agreement | 2 |  |  |  |
Target value of awards granted |  |  |  |  | $ 1,500,000
Amount of payout |  | $ 1,900,000 |  |  |
Maximum cash payment | $ 10,000,000 |  |  |  |
Period for determination of cash payment value | trading_day | 30 |  |  |  |
Maximum price per share to trigger maximum cash payment (in dollars per share) | $ / shares | $ 60 |  |  |  |

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