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Unrecognized Tax Benefits Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Taxes [Line Items]        
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    
Unrecognized Tax Benefits 63us-gaap_UnrecognizedTaxBenefits 63us-gaap_UnrecognizedTaxBenefits 54us-gaap_UnrecognizedTaxBenefits 186us-gaap_UnrecognizedTaxBenefits
Non Avis Budget Car Rental Tax Contingencies        
Income Taxes [Line Items]        
Unrecognized Tax Benefits $ 16us-gaap_UnrecognizedTaxBenefits
/ us-gaap_IncomeTaxAuthorityAxis
= car_NonAvisBudgetCarRentalTaxContingenciesMember		 $ 15us-gaap_UnrecognizedTaxBenefits
/ us-gaap_IncomeTaxAuthorityAxis
= car_NonAvisBudgetCarRentalTaxContingenciesMember