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Income Taxes - Allocation of Total Income Taxes (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Tax Benefit/(Loss) Applicable To: [Abstract]
Income/(loss) from continuing operations, before income taxes	$ 187	$ 170	$ (1)	$ 480
Discontinued operations	$ 0	$ (2)	$ 0	$ 11
Effective tax rate benefit	19.80%	15.40%	0.00%	22.90%

Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

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