Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Basic EPS
Income (loss) from continuing operations	$ (215)	$ 1,137
Less: Income from continuing operations attributable to noncontrolling interest		(2)
Income from continuing operations attributable to common stock	(215)	1,135
Discontinued operations, net	(3)	255
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCK	(218)	1,390
Less: Net income allocated to participating securities		(2)
Net income attributable to common stock, net of participating securities	(218)	1,388
Weighted average number of basic shares	769.6	791.3
Basic EPS (in dollars per share)	$ (0.28)	$ 1.75
Diluted EPS
Net income attributable to common stock, net of participating securities	$ (218)	$ 1,388
Weighted average number of basic shares	769.6	791.3
Dilutive effect of potentially dilutive securities (in shares)		0.4
Total diluted weighted average common shares	769.6	791.7
Diluted EPS (in dollars per share)	$ (0.28)	$ 1.75