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Income Taxes - Allocation of Total Income Taxes (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income tax (benefit)/provision applicable to:
Loss from continuing operations, before income taxes	$ (543)us-gaap_IncomeTaxExpenseBenefit	$ (1,517)us-gaap_IncomeTaxExpenseBenefit	$ (701)us-gaap_IncomeTaxExpenseBenefit
Discontinued operations	(21)	(32)	(120)
Accumulated other comprehensive income/(loss)	0us-gaap_OtherComprehensiveIncomeLossTax	16us-gaap_OtherComprehensiveIncomeLossTax	11us-gaap_OtherComprehensiveIncomeLossTax
Additional paid in capital	$ 0	$ 15	$ (2)

Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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