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Debt Annual Contractual Maturities of Principal on Debt Outstanding (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Debt Disclosure [Abstract]  
2015 $ 53us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
2016 195us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
Total $ 248us-gaap_LoansPayable