Consolidated Statement Of Equity - 9 months ended Sep. 30, 2016 - USD ($) shares in Thousands, $ 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, 2015		149,380
Beginning Balance at Dec. 31, 2015	$ 8,375	$ 2	$ 6,267	$ (199)	$ 2,298	$ 7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Shares, New Issues		19,838
Stock Issued During Period, Value, New Issues	2,534	$ 0	2,534
Dividends declared ($0.04 per share)	(13)				(13)
Exercise of long-term incentive plan stock options and employee stock purchases, shares		0
Exercise of long-term incentive plan stock options and employee stock purchases	7		1	6
Treasury stock purchases, shares		(197)
Treasury stock purchases	(24)			(24)
Tax benefit related to stock-based compensation	(1)		(1)
Compensation costs:
Vested compensation awards, net, shares		598
Vested compensation awards, net	0	$ 0	0
Compensation costs included in net income	66		66			0
Net loss	(513)				(513)	0
Ending Balance, shares at Sep. 30, 2016		169,717
Ending Balance at Sep. 30, 2016	$ 10,431	$ 2	$ 8,867	$ (217)	$ 1,772	$ 7