Capital Stock - Net Income (loss) Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Basic:
Loss from continuing operations	$ (489)	$ (4,519)
Loss from discontinued operations	0	(132)
NET LOSS ATTRIBUTABLE TO COMMON STOCK	$ (489)	$ (4,651)
Loss from continuing operations, shares	378	377
Loss from discontinued operations, shares	378	377
Loss attributable to common stock, shares	378	377
Basic loss from continuing operations, per share	$ (1.29)	$ (11.99)
Basic loss from discontinued operations, per share	0.00	(0.35)
Basic net loss per share	$ (1.29)	$ (12.34)
Effect of Dilutive Securities:
Stock options and other, shares	0	0
Diluted:
Loss from continuing operations	$ (489)	$ (4,519)
Loss from discontinued operations	0	(132)
Loss attributable to common stock	$ (489)	$ (4,651)
Loss from continuing operations, shares	378	377
Loss from discontinued operations, shares	378	377
Loss attributable to common stock, shares	378	377
Diluted loss from continuing operations, per share	$ (1.29)	$ (11.99)
Diluted loss from discontinued operations, per share	0.00	(0.35)
Diluted net loss per share	$ (1.29)	$ (12.34)