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Subsequent Events (Narrative) (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Subsequent Event [Member]
USD ($)
Jun. 30, 2015
Subsequent Event [Member]
USD ($)
Apr. 01, 2015
International Debt Borrowings [Member]
Subsequent Event [Member]
EUR (€)
Mar. 31, 2015
Five And One Over Four Senior Notes [Member]
Senior Notes [Member]
USD ($)
Apr. 01, 2015
Five And One Over Four Senior Notes [Member]
Senior Notes [Member]
Subsequent Event [Member]
USD ($)
Apr. 01, 2015
Nine And Three Over Four Senior Notes [Member]
Senior Notes [Member]
USD ($)
Apr. 01, 2015
Nine And Three Over Four Senior Notes [Member]
Senior Notes [Member]
Subsequent Event [Member]
USD ($)
Subsequent Event [Line Items]              
Debt Instrument, Face Amount       $ 375,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= car_FiveAndOneOverFourSeniorNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
$ 375,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= car_FiveAndOneOverFourSeniorNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Debt Instrument, Repurchased Face Amount           223,000,000us-gaap_DebtInstrumentRepurchasedFaceAmount
/ us-gaap_DebtInstrumentAxis
= car_NineAndThreeOverFourSeniorNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
223,000,000us-gaap_DebtInstrumentRepurchasedFaceAmount
/ us-gaap_DebtInstrumentAxis
= car_NineAndThreeOverFourSeniorNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Payments of Debt Extinguishment Costs 23,000,000us-gaap_PaymentsOfDebtExtinguishmentCosts
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
           
Business Combination, Consideration Transferred   160,000,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
         
Vehicle Program Debt Total Capacity, increase (decrease), net     € 1,000,000,000car_VehicleProgramDebtTotalCapacityincreasedecreasenet
/ us-gaap_LongtermDebtTypeAxis
= car_InternationalDebtBorrowingsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember