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Unrecognized Tax Benefits (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]    
Unrecognized tax benefits, non-current income taxes payable $ 45car_Unrecognizedtaxbenefitsnoncurrentincometaxespayable $ 44car_Unrecognizedtaxbenefitsnoncurrentincometaxespayable
Unrecognized Tax Benefits, Interest on Income Taxes Accrued $ 30us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued $ 28us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued