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Income Taxes - Difference Between Effective Tax Rate (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Income tax provision (benefit) at federal statutory rate									$ (181)	$ 62	$ 78
Foreign tax rate differential									(1)	(6)	(5)
State income tax provision (benefit), net of federal benefit									(8)	3	3
Nondeductible expenses									3	2	2
Foreign tax credits									(3)		(1)
Nondeductible goodwill impairment									42
Change in valuation allowance									129
Change in contingency reserve and other									3	1	(2)
Income tax provision (benefit)	$ 63	$ (67)	$ (10)	$ (2)	$ 8	$ 17	$ 16	$ 21	$ (16)	$ 62	$ 75
Effective tax rate									3.00%	34.90%	33.80%

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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