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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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