Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Basic EPS
Loss from continuing operations	$ (238)	$ (2,606)	$ (734)	$ (2,641)
Discontinued operations, net	(3)	(3)	432	(10)
NET LOSS	(241)	(2,609)	(302)	(2,651)
Net loss, net of participating securities	$ (241)	$ (2,609)	$ (302)	$ (2,651)
Weighted average number of basic shares	764.0	763.3	763.7	766.4
Basic EPS (in dollars per share)	$ (0.32)	$ (3.42)	$ (0.40)	$ (3.46)
Diluted EPS
Net loss, net of participating securities	$ (241)	$ (2,609)	$ (302)	$ (2,651)
Weighted average number of basic shares	764.0	763.3	763.7	766.4
Total diluted weighted average common shares	764.0	763.3	763.7	766.4
Diluted EPS (in dollars per share)	$ (0.32)	$ (3.42)	$ (0.40)	$ (3.46)