CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - 3 months ended Mar. 31, 2018 - 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, 2017	$ 6	$ 4,933	$ 8,588	$ 8	$ (7,516)	$ 23	$ 6,042
Beginning balance, shares at Dec. 31, 2017	630,282				(196,964)
Equity roll forward
Adoption of new accounting standards			85	(5)			80
Consolidated net income			396			(1)	395
Other comprehensive income (loss), net of tax				(31)			(31)
Cash dividends			(206)				(206)
Equity-based compensation transactions, net of tax		(17)	4		$ 57		44
Equity-based compensation transaction, shares					1,483
Common stock repurchase program					$ (258)		(258)
Common stock repurchase program, shares					(3,031)
Other, net						(1)	(1)
Other, net, shares					1
Ending balance at Mar. 31, 2018	$ 6	$ 4,916	$ 8,867	$ (28)	$ (7,717)	$ 21	$ 6,065
Ending balance, shares at Mar. 31, 2018	630,282				(198,511)