Consolidated Statement Of Equity - 6 months ended Jun. 30, 2015 - USD ($) shares in Millions, $ in Millions	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Noncontrolling Interests [Member]
Beginning Balance, shares at Dec. 31, 2014		149
Beginning Balance at Dec. 31, 2014	$ 8,589	$ 2	$ 6,167	$ (171)	$ 2,583	$ 8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared ($0.04 per share)	(6)				(6)
Treasury stock purchases, shares		0
Treasury stock purchases	(31)			(31)
Tax benefit related to stock-based compensation	6		6
Compensation costs:
Compensation costs included in net income	47		47			0
Cash distributions to noncontrolling interests	(1)					(1)
Net loss	(296)				(296)	0
Ending Balance, shares at Jun. 30, 2015		149
Ending Balance at Jun. 30, 2015	$ 8,308	$ 2	$ 6,220	$ (202)	$ 2,281	$ 7