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Schedule Of Debt Under Vehicle Programs (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]    
Debt under vehicle programs $ 8,116car_VehicleProgramOutstandingDebt $ 7,337car_VehicleProgramOutstandingDebt
Debt Due To Rental Car Funding [Member]    
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]    
Debt under vehicle programs 6,340car_VehicleProgramOutstandingDebt
/ us-gaap_LongtermDebtTypeAxis
= car_DebtDueToRentalCarFundingMember		 5,656car_VehicleProgramOutstandingDebt
/ us-gaap_LongtermDebtTypeAxis
= car_DebtDueToRentalCarFundingMember
Canada Debt Borrowings    
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]    
Debt, Weighted Average Interest Rate 3.00%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= car_CanadaDebtBorrowingsMemberDomain		  
Debt under vehicle programs 489car_VehicleProgramOutstandingDebt
/ us-gaap_LongtermDebtTypeAxis
= car_CanadaDebtBorrowingsMemberDomain		 400car_VehicleProgramOutstandingDebt
/ us-gaap_LongtermDebtTypeAxis
= car_CanadaDebtBorrowingsMemberDomain
International Debt Borrowings    
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]    
Debt under vehicle programs 690car_VehicleProgramOutstandingDebt
/ us-gaap_LongtermDebtTypeAxis
= car_InternationalDebtBorrowingsMember		 731car_VehicleProgramOutstandingDebt
/ us-gaap_LongtermDebtTypeAxis
= car_InternationalDebtBorrowingsMember
International Capital Leases    
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]    
Debt under vehicle programs 314car_VehicleProgramOutstandingDebt
/ us-gaap_LongtermDebtTypeAxis
= car_InternationalCapitalLeasesDomain		 289car_VehicleProgramOutstandingDebt
/ us-gaap_LongtermDebtTypeAxis
= car_InternationalCapitalLeasesDomain
Budget Truck Financing    
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]    
Debt, Weighted Average Interest Rate 3.00%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= car_BudgetTruckFundingProgramMember		  
Debt under vehicle programs 252car_VehicleProgramOutstandingDebt
/ us-gaap_LongtermDebtTypeAxis
= car_BudgetTruckFundingProgramMember		 226car_VehicleProgramOutstandingDebt
/ us-gaap_LongtermDebtTypeAxis
= car_BudgetTruckFundingProgramMember
Other    
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]    
Debt under vehicle programs $ 31car_VehicleProgramOutstandingDebt
/ us-gaap_LongtermDebtTypeAxis
= car_OtherDebtUnderVehicleProgramMember		 $ 35car_VehicleProgramOutstandingDebt
/ us-gaap_LongtermDebtTypeAxis
= car_OtherDebtUnderVehicleProgramMember