Capital Stock - Net Income (loss) Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Loss from continuing operations	$ (5,560)	$ (1,174)	$ (14,947)	$ (73)
Loss from discontinued operations	(95)	(156)	(959)	(516)
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCK	(5,655)	(1,330)	(15,906)	(589)
Loss from continuing operations	(5,560)	(1,174)	(14,947)	(73)
Loss from discontinued operations	(95)	(156)	(959)	(516)
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCK	$ (5,655)	$ (1,330)	$ (15,906)	$ (589)
Loss from continuing operations, shares	378	381	378	387
Loss from discontinued operations, shares	378	381	378	387
Loss attributable to common stock, shares	378	381	378	387
Stock options and other, shares	0	0	0	0
Loss from continuing operations, shares	378	381	378	387
Loss from discontinued operations, shares	378	381	378	387
Loss attributable to common stock, shares	378	381	378	387
Basic loss from continuing operations per share	$ (14.70)	$ (3.08)	$ (39.58)	$ (0.19)
Basic loss from discontinued operations per share	(0.25)	(0.42)	(2.54)	(1.33)
Loss attributable to common stock per share	(14.95)	(3.50)	(42.12)	(1.52)
Diluted loss from continuing operations per share	(14.70)	(3.08)	(39.58)	(0.19)
Diluted loss from discontinued operations per share	(0.25)	(0.42)	(2.54)	(1.33)
Loss attributable to common stock, per share	$ (14.95)	$ (3.50)	$ (42.12)	$ (1.52)