CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) shares in Thousands, $ in Millions	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]	Noncontrolling Interests [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			728			1	729
Other comprehensive income (loss), net of tax				65			65
Cash dividends declared			(440)				(440)
Equity-based compensation transactions, net		5	3		$ 74		82
Equity-based compensation transaction, shares					1,808
Common stock repurchase program		(36)			$ (208)		(244)
Common stock repurchase program, shares					(1,993)
Other, net						(1)	(1)
Other, net, shares					2
Ending balance at Jun. 30, 2019	$ 6	4,962	10,088	(22)	$ (8,568)	1	6,467
Ending balance, shares at Jun. 30, 2019	630,282				(206,482)
Beginning balance at Mar. 31, 2019	$ 6	4,978	9,924	(53)	$ (8,440)	2	6,417
Beginning balance, shares at Mar. 31, 2019	630,282				(205,556)
Equity roll forward
Consolidated net income			381			1	382
Other comprehensive income (loss), net of tax				31			31
Cash dividends declared			(217)				(217)
Equity-based compensation transactions, net		20			$ 16		36
Equity-based compensation transaction, shares					387
Common stock repurchase program		(36)			$ (144)		(180)
Common stock repurchase program, shares					(1,314)
Other, net						(2)	(2)
Other, net, shares					1
Ending balance at Jun. 30, 2019	$ 6	4,962	10,088	(22)	$ (8,568)	1	6,467
Ending balance, shares at Jun. 30, 2019	630,282				(206,482)
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)
Ending balance at Mar. 31, 2020	$ 6	5,026	10,718	(91)	$ (8,916)	2	6,745
Ending balance, shares at Mar. 31, 2020	630,282				(208,287)
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			668				668
Other comprehensive income (loss), net of tax				(33)			(33)
Cash dividends declared			(466)				(466)
Equity-based compensation transactions, net		(9)	3		$ 64		58
Equity-based compensation transaction, shares					1,523
Common stock repurchase program					$ (402)		(402)
Common stock repurchase program, shares					(3,687)
Adoption of new accounting standard			(2)				(2)
Other, net, shares					2
Ending balance at Jun. 30, 2020	$ 6	5,040	10,795	(41)	$ (8,909)	2	6,893
Ending balance, shares at Jun. 30, 2020	630,282				(208,118)
Beginning balance at Mar. 31, 2020	$ 6	5,026	10,718	(91)	$ (8,916)	2	6,745
Beginning balance, shares at Mar. 31, 2020	630,282				(208,287)
Equity roll forward
Consolidated net income			307				307
Other comprehensive income (loss), net of tax				50			50
Cash dividends declared			(230)				(230)
Equity-based compensation transactions, net		14			$ 7		21
Equity-based compensation transaction, shares					169
Ending balance at Jun. 30, 2020	$ 6	$ 5,040	$ 10,795	$ (41)	$ (8,909)	$ 2	$ 6,893
Ending balance, shares at Jun. 30, 2020	630,282				(208,118)