CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN EQUITY - 9 months ended Sep. 30, 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			1,394			(2)	1,392
Other comprehensive income (loss), net of tax				(19)			(19)
Cash dividends			(605)				(605)
Equity-based compensation transactions, net		34	2		$ 84		120
Equity-based compensation transaction, shares					2,181
Common stock repurchase program		(40)			$ (710)		(750)
Common stock repurchase program, shares					(8,375)
Divestiture of noncontrolling interest						(19)	(19)
Other, net, shares					1
Ending balance at Sep. 30, 2018	$ 6	$ 4,927	$ 9,464	$ (16)	$ (8,142)	$ 2	$ 6,241
Ending balance, shares at Sep. 30, 2018	630,282				(203,157)