CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) shares in Thousands, $ in Millions	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]	Noncontrolling Interests [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	Total
Beginning balance at Dec. 31, 2018	$ 6	$ 4,993		$ 9,797	$ (87)	$ (8,434)	$ 1		$ 6,276
Beginning balance, shares at Dec. 31, 2018	630,282					(206,299)
Equity roll forward
Consolidated net income				1,223			1		1,224
Other comprehensive income (loss), net of tax					54				54
Cash dividends declared				(658)					(658)
Equity-based compensation transactions, net		33		2		$ 100			135
Equity-based compensation transaction, shares						2,421
Common stock repurchase program						$ (244)			(244)
Common stock repurchase program, shares						(2,247)
Other, net, shares						3
Ending balance at Sep. 30, 2019	$ 6	5,026		10,364	(33)	$ (8,578)	2		6,787
Ending balance, shares at Sep. 30, 2019	630,282					(206,122)
Beginning balance at Jun. 30, 2019	$ 6	4,962		10,088	(22)	$ (8,568)	1		6,467
Beginning balance, shares at Jun. 30, 2019	630,282					(206,482)
Equity roll forward
Consolidated net income				495					495
Other comprehensive income (loss), net of tax					(11)				(11)
Cash dividends declared				(218)					(218)
Equity-based compensation transactions, net		28		(1)		$ 26			53
Equity-based compensation transaction, shares						613
Common stock repurchase program		36				$ (36)
Common stock repurchase program, shares						(254)
Other, net							1		1
Other, net, shares						1
Ending balance at Sep. 30, 2019	$ 6	5,026		10,364	(33)	$ (8,578)	2		6,787
Ending balance, shares at Sep. 30, 2019	630,282					(206,122)
Beginning balance at Dec. 31, 2019	$ 6	5,049		10,592	(8)	$ (8,571)	2		7,070
Beginning balance, shares at Dec. 31, 2019	630,282					(205,956)
Equity roll forward
Consolidated net income				1,058					1,058
Other comprehensive income (loss), net of tax					(8)				(8)
Cash dividends declared				(696)					(696)
Equity-based compensation transactions, net		55		1		$ 82			138
Equity-based compensation transaction, shares						1,945
Common stock repurchase program						$ (402)			(402)
Common stock repurchase program, shares						(3,687)
Other, net				(1)					(1)
Other, net, shares						3
Ending balance at Sep. 30, 2020	$ 6	5,104	$ (2)	10,952	(16)	$ (8,891)	2	$ (2)	7,157
Ending balance, shares at Sep. 30, 2020	630,282					(207,695)
Beginning balance at Jun. 30, 2020	$ 6	5,040		10,795	(41)	$ (8,909)	2		6,893
Beginning balance, shares at Jun. 30, 2020	630,282					(208,118)
Equity roll forward
Consolidated net income				390					390
Other comprehensive income (loss), net of tax					25				25
Cash dividends declared				(230)					(230)
Equity-based compensation transactions, net		64		(2)		$ 18			80
Equity-based compensation transaction, shares						422
Other, net				(1)					(1)
Other, net, shares						1
Ending balance at Sep. 30, 2020	$ 6	$ 5,104	$ (2)	$ 10,952	$ (16)	$ (8,891)	$ 2	$ (2)	$ 7,157
Ending balance, shares at Sep. 30, 2020	630,282					(207,695)