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Summary Of Net Periodic Benefit Cost (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Employee Benefit Plans [Abstract]      
Service cost $ 5us-gaap_DefinedBenefitPlanServiceCost $ 5us-gaap_DefinedBenefitPlanServiceCost $ 5us-gaap_DefinedBenefitPlanServiceCost
Interest cost 29us-gaap_DefinedBenefitPlanInterestCost 26us-gaap_DefinedBenefitPlanInterestCost 27us-gaap_DefinedBenefitPlanInterestCost
Expected return on plan assets (32)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets (28)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets (25)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets
Amortization of unrecognized amounts 3car_DefinedBenefitPlanAmortizationOfUnrecognizedAmounts 15car_DefinedBenefitPlanAmortizationOfUnrecognizedAmounts 14car_DefinedBenefitPlanAmortizationOfUnrecognizedAmounts
Net periodic benefit cost $ 5us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost $ 18us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost $ 21us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost