CONSOLIDATED STATEMENT OF EQUITY - 3 months ended Mar. 31, 2017 - USD ($) $ in Millions		Total	Common Stock [Member]	Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interests [Member]
Balance at Dec. 31, 2016		$ 15,497	$ 57	$ 11,875	$ 1,704	$ (1,033)	$ (391)	$ 3,285
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(275)			(318)			43
Common stock issued	[1]	42	0	42		0
Dividends—common stock		(28)			(28)
Repurchase of common stock		(21)				(21)
Distributions to noncontrolling interest owners		(105)						(105)
Reclassification of previously deferred derivative losses to (gains) losses on derivatives, net		1					1
Adjustments for pension and other postretirement plans		(1)					(1)
Balance at Mar. 31, 2017		15,079	$ 57	11,914	1,330	$ (1,054)	$ (391)	$ 3,223
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of accounting change		$ (31)		$ (3)	$ (28)

[1] Represents share-based compensation expense.