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Maximum range number of shares approved, net of any subsequent amendments and adjustments, for awards under share-based compensation plans.

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Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements.

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Amount of discretionary contributions made by an employer to a defined contribution plan.

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Stock-Based and Other Compensation Plans - Narrative (Details) $ / shares in Units, $ in Millions			12 Months Ended
	Feb. 19, 2019 shares	Feb. 01, 2016 shares	Dec. 31, 2019 USD ($) simulation $ / shares shares	Dec. 31, 2018 USD ($) simulation $ / shares shares	Dec. 31, 2017 USD ($) simulation $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer matching contribution, percent of employees' gross pay			6.00%
401K plan employer cash contributions			$ 32	$ 31	$ 31
Deferred compensation plan assets			27	38
Deferred compensation liabilities			$ 29	$ 43
Deferred compensation arrangement most shares held by individual \| shares			64,729	267,792
Deferred compensation arrangement plan, distribution amount \| shares			200,000	200,000	200,000
Deferred compensation arrangements trust plan, distribution amount			$ 23	$ 18	$ 21
Deferred compensation expense			9	2	9
Deferred compensation liabilities			$ 99	104
Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total intrinsic value of options exercised				$ 5	$ 4
Minimum term to maturity on US Treasuries used to determine the risk free rate assumption in valuing stock options			5 years
Maximum term to maturity on US Treasuries used to determine the risk free rate assumption in valuing stock options			7 years
The period ended, prior to the date of grant, over which an average of daily stock prices is computed in determining the dividend yield			3 years
Duration of dividends			1 year
Unrecognized compensation cost related to nonvested awards			$ 5
The weighted-average period over which unrecognized compensation cost is to be recognized (in years)			1 year 2 months 12 days
Expected volatility			33.80%	33.40%	33.20%
Risk-free rate			2.70%	2.60%	2.20%
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total fair value of vested restricted stock			$ 20	$ 29	$ 34
Weighted average award date fair value, shares awarded (in dollars per share) \| $ / shares			$ 19.54	$ 27.96	$ 35.45
Unrecognized compensation cost related to nonvested awards			$ 74
The weighted-average period over which unrecognized compensation cost is to be recognized (in years)			1 year 4 months 24 days
Number of simulations \| simulation			10,000,000	10,000,000	500,000
Expected volatility			37.50%	35.00%	35.00%
Risk-free rate			2.50%	2.30%	1.50%
Phantom Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total fair value of vested restricted stock			$ 10
Unrecognized compensation cost related to nonvested awards			$ 11
The weighted-average period over which unrecognized compensation cost is to be recognized (in years)			2 years 1 month 6 days
Accrued liability related to phantom units			$ 5
2017 Long-Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares of common stock authorized for issuance After April 26, 2011 (in shares) \| shares			44,000,000
Number of shares of common stock reserved for issuance (in shares) \| shares			39,693,735
Shares of common stock available for future grants and awards (in shares) \| shares			28,407,839
Expiration period (in years)			10 years
2017 Long-Term Incentive Plan \| Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years
2017 Long-Term Incentive Plan \| Restricted Stock \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			2 years
2017 Long-Term Incentive Plan \| Restricted Stock \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years
2017 Long-Term Incentive Plan \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years
2017 Long-Term Incentive Plan \| Phantom Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Number of phantom units issued (in shares) \| shares	803,606
2015 Stock Plan for Non-Employee Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares of common stock authorized for issuance After April 26, 2011 (in shares) \| shares			708,996
Number of shares of common stock reserved for issuance (in shares) \| shares			485,062
Shares of common stock available for future grants and awards (in shares) \| shares			306,243
Stock Option And Restricted Stock Plan 1992 \| Phantom Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of phantom units issued (in shares) \| shares		1,000,000
Vested (in dollars per share) \| $ / shares			$ 31.65
Number of simulations \| simulation			500,000
Expected volatility			38.00%
Risk-free rate			0.90%
Vesting percentage			0.00%
Subject to Time Vesting \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average award date fair value, shares awarded (in dollars per share) \| $ / shares			$ 22.33
Weighted average grant date fair value (in dollars per share) \| $ / shares			27.02	$ 32.72
Vested (in dollars per share) \| $ / shares			34.11
Subject to Time Vesting \| Phantom Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average award date fair value, shares awarded (in dollars per share) \| $ / shares			22.39
Weighted average grant date fair value (in dollars per share) \| $ / shares			22.39	$ 31.65
Vested (in dollars per share) \| $ / shares			$ 31.65