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			347				347
Other comprehensive income (loss), net of tax				34			34
Cash dividends declared			(223)				(223)
Equity-based compensation transactions, net		(15)	3		$ 58		46
Equity-based compensation transaction, shares					1,421
Common stock repurchase program					$ (64)		(64)
Common stock repurchase program, shares					(679)
Other, net						1	1
Other, net, shares					1
Ending balance at Mar. 31, 2019	$ 6	4,978	9,924	(53)	$ (8,440)	2	6,417
Ending balance, shares at Mar. 31, 2019	630,282				(205,556)
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			361				361
Other comprehensive income (loss), net of tax				(83)			(83)
Cash dividends declared			(236)				(236)
Equity-based compensation transactions, net		(23)	3		$ 57		37
Equity-based compensation transaction, shares					1,355
Common stock repurchase program					$ (402)		(402)
Common stock repurchase program, shares					(3,687)
Adoption of new accounting standard			(2)				(2)
Other, net, shares					1
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)