Provision for (Benefit from) Income Taxes (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current
Federal	$ (1)us-gaap_CurrentFederalTaxExpenseBenefit	$ (4)us-gaap_CurrentFederalTaxExpenseBenefit	$ (109)us-gaap_CurrentFederalTaxExpenseBenefit
State	4	12	(16)
Foreign	79us-gaap_CurrentForeignTaxExpenseBenefit	36us-gaap_CurrentForeignTaxExpenseBenefit	7us-gaap_CurrentForeignTaxExpenseBenefit
Current income tax provision (benefit)	82us-gaap_CurrentIncomeTaxExpenseBenefit	44us-gaap_CurrentIncomeTaxExpenseBenefit	(118)us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred
Federal	89	28	93
State	2	8	20
Foreign	(26)	1	15
Deferred income tax provision	65us-gaap_DeferredIncomeTaxExpenseBenefit	37us-gaap_DeferredIncomeTaxExpenseBenefit	128us-gaap_DeferredIncomeTaxExpenseBenefit
Provision for income taxes	$ 147us-gaap_IncomeTaxExpenseBenefit	$ 81us-gaap_IncomeTaxExpenseBenefit	$ 10us-gaap_IncomeTaxExpenseBenefit

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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