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Debt Under Vehicle Programs And Borrowing Arrangements - Additional Information (Detail)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2014
Avis Budget Rental Car Funding Program
Dec. 31, 2014
Americas
USD ($)
Dec. 31, 2013
Americas
Dec. 31, 2014
International Debt Borrowings
USD ($)
Dec. 31, 2013
International Debt Borrowings
Dec. 31, 2014
International Capital Leases
USD ($)
Mar. 31, 2014
Debt Due To Rental Car Funding [Member]
USD ($)
Sep. 30, 2014
Debt Due To Rental Car Funding [Member]
USD ($)
Dec. 31, 2014
Debt Due To Rental Car Funding [Member]
USD ($)
Dec. 31, 2014
European Rental Fleet Securitization [Member]
EUR (€)
Dec. 31, 2013
European Rental Fleet Securitization [Member]
EUR (€)
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]                        
Leasing Vehicles And Related Assets Pledged As Collateralized Debt $ 8,000car_LeasingVehiclesAndRelatedAssetsPledgedAsCollateralizedDebt   $ 1,000,000,000car_LeasingVehiclesAndRelatedAssetsPledgedAsCollateralizedDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_AmericasMember
  $ 1,200,000,000car_LeasingVehiclesAndRelatedAssetsPledgedAsCollateralizedDebt
/ us-gaap_LongtermDebtTypeAxis
= car_InternationalDebtBorrowingsDomain
  $ 298,000,000car_LeasingVehiclesAndRelatedAssetsPledgedAsCollateralizedDebt
/ us-gaap_LongtermDebtTypeAxis
= car_InternationalCapitalLeasesDomain
    $ 8,000,000,000car_LeasingVehiclesAndRelatedAssetsPledgedAsCollateralizedDebt
/ us-gaap_LongtermDebtTypeAxis
= car_DebtDueToRentalCarFundingMember
   
Debt Instrument, Issuance Date               Feb. 01, 2014 Jul. 01, 2014      
Debt, Weighted Average Interest Rate   3.00%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= car_AvisBudgetRentalCarFundingProgramMember
3.00%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_AmericasMember
4.00%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_AmericasMember
3.00%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= car_InternationalDebtBorrowingsDomain
4.00%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= car_InternationalDebtBorrowingsDomain
           
Newly Issued European Credit Facility                     290car_NewlyIssuedEuropeanCreditFacility
/ us-gaap_LongtermDebtTypeAxis
= car_EuropeanRentalFleetSecuritizationMember
500car_NewlyIssuedEuropeanCreditFacility
/ us-gaap_LongtermDebtTypeAxis
= car_EuropeanRentalFleetSecuritizationMember
Interest rate on capital leases 2.00%us-gaap_CapitalLeasesOfLesseeContingentRentalsBasisSpreadOnVariableRate                      
Asset-Backed Securities, at Carrying Value               $ 675us-gaap_AssetBackedSecuritiesAtCarryingValue
/ us-gaap_LongtermDebtTypeAxis
= car_DebtDueToRentalCarFundingMember
$ 500us-gaap_AssetBackedSecuritiesAtCarryingValue
/ us-gaap_LongtermDebtTypeAxis
= car_DebtDueToRentalCarFundingMember
     
Debt Instrument, Maturity Date                   Feb. 01, 2020