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Long-Term Debt And Borrowing Arrangements (Narrative) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Apr. 01, 2015
Debt Instrument [Line Items]        
Other Long-term Debt 29us-gaap_OtherLongTermDebt   $ 34us-gaap_OtherLongTermDebt  
Long-term Debt 3,725us-gaap_LongTermDebt   3,420us-gaap_LongTermDebt  
Uncommitted Credit Facility [Member] | Minimum [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Interest Rate During Period 0.41%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
/ us-gaap_LongtermDebtTypeAxis
= car_UncommittedCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Uncommitted Credit Facility [Member] | Maximum [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Interest Rate During Period 2.50%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
/ us-gaap_LongtermDebtTypeAxis
= car_UncommittedCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
     
Floating Rate Term Loan Due March Two Thousand Nineteen [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Maturity Date, Description March 2019      
Debt Instrument, Description of Variable Rate Basis 225 basis points      
Floating Rate Notes [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Description of Variable Rate Basis 275 basis points      
Five and One over Eight Senior Notes [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Maturity Date, Description June 2022      
Five And One Over Four Senior Notes [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Maturity Date, Description March 2025      
Five And One Over Four Senior Notes [Member] | Senior Notes [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount 375us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= car_FiveAndOneOverFourSeniorNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
     
Nine And Three Over Four Senior Notes [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Maturity Date, Description March 2020      
Nine And Three Over Four Senior Notes [Member] | Senior Notes [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Repurchased Face Amount       223us-gaap_DebtInstrumentRepurchasedFaceAmount
/ us-gaap_DebtInstrumentAxis
= car_NineAndThreeOverFourSeniorNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Repayments of Long-term Debt   $ 243us-gaap_RepaymentsOfLongTermDebt
/ us-gaap_DebtInstrumentAxis
= car_NineAndThreeOverFourSeniorNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember