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Income Taxes - Allocation of Total Income Taxes (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income Tax Benefit/(Loss) Applicable To: [Abstract]
Income/(loss) from continuing operations, before income taxes	$ (192)us-gaap_IncomeTaxExpenseBenefit	$ 136us-gaap_IncomeTaxExpenseBenefit
Discontinued operations	$ 0	$ 19
Effective tax rate benefit	2.70%	30.80%

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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