Consolidated Statement Of Equity (USD $) In Millions, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Noncontrolling Interests [Member]
Beginning Balance at Dec. 31, 2014	$ 8,589	$ 2	$ 6,167	$ (171)	$ 2,583	$ 8
Beginning Balance, shares at Dec. 31, 2014		149
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared ($0.04 per share)	(5)				(5)
Treasury stock purchases, shares		0
Treasury stock purchases	(30)			(30)
Tax benefit related to stock-based compensation	1		1
Compensation costs:
Compensation costs included in net income	22		22			0
Net loss	(78)				(78)	0
Ending Balance at Mar. 31, 2015	$ 8,499	$ 2	$ 6,190	$ (201)	$ 2,500	$ 8
Ending Balance, shares at Mar. 31, 2015		149