Condensed Consolidated Statement of Changes in Equity - 9 months ended Sep. 30, 2017 - 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, 2016	$ 6	$ 4,850	$ 7,388	$ (80)	$ (6,867)	$ 23	$ 5,320
Beginning balance, shares at Dec. 31, 2016	630,282				(190,967)
Equity roll forward
Consolidated net income			1,046				1,046
Other comprehensive income, net of tax				94			94
Cash dividends			(566)				(566)
Equity-based compensation transactions, net		11	3		$ 143		157
Equity-based compensation transaction, shares					3,974
Common stock repurchase program		(55)			$ (695)		(750)
Common stock repurchase program, shares					(9,082)
Other, net						(1)	(1)
Other, net, shares					(2)
Ending balance at Sep. 30, 2017	$ 6	$ 4,806	$ 7,871	$ 14	$ (7,419)	$ 22	$ 5,300
Ending balance, shares at Sep. 30, 2017	630,282				(196,077)