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Long-Term Debt And Borrowing Arrangements (Schedule Of Long-Term Debt) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]      
Other $ 29us-gaap_OtherLongTermDebt   $ 34us-gaap_OtherLongTermDebt
Long-term Debt 3,725us-gaap_LongTermDebt   3,420us-gaap_LongTermDebt
Long-term Debt, Current Maturities 244us-gaap_LongTermDebtCurrent   28us-gaap_LongTermDebtCurrent
Long-term debt 3,481us-gaap_LongTermDebtNoncurrent   3,392us-gaap_LongTermDebtNoncurrent
Four And Seven Over Eight Senior Notes [Member]      
Debt Instrument [Line Items]      
Long-term debt 300us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= car_FourAndSevenOverEightSeniorNotesMember
  300us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= car_FourAndSevenOverEightSeniorNotesMember
Debt Instrument, Maturity Date, Description November 2017    
Four And Seven Over Eight Senior Notes [Member] | Long Term Borrowings [Member]      
Debt Instrument [Line Items]      
Debt instrument stated interest percentage 4.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= car_FourAndSevenOverEightSeniorNotesMember
/ car_LongTermBorrowingByTypeAxis
= car_LongTermBorrowingsMember
   
Floating Rate Term Loan Due March Two Thousand Nineteen [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 3.96%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= car_FloatingRateTermLoanDueMarchTwoThousandNineteenMember
   
Long-term debt 977us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= car_FloatingRateTermLoanDueMarchTwoThousandNineteenMember
  980us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= car_FloatingRateTermLoanDueMarchTwoThousandNineteenMember
Debt Instrument, Maturity Date, Description March 2019    
Debt Instrument, Description of Variable Rate Basis 225 basis points    
Percentage Of Margin Aggregate Interest Rate 3.00%car_PercentageOfMarginAggregateInterestRate
/ us-gaap_DebtInstrumentAxis
= car_FloatingRateTermLoanDueMarchTwoThousandNineteenMember
   
Nine And Three Over Four Senior Notes [Member]      
Debt Instrument [Line Items]      
Long-term debt 223us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= car_NineAndThreeOverFourSeniorNotesMember
  223us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= car_NineAndThreeOverFourSeniorNotesMember
Debt Instrument, Maturity Date, Description March 2020    
Nine And Three Over Four Senior Notes [Member] | Long Term Borrowings [Member]      
Debt Instrument [Line Items]      
Debt instrument stated interest percentage 9.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= car_NineAndThreeOverFourSeniorNotesMember
/ car_LongTermBorrowingByTypeAxis
= car_LongTermBorrowingsMember
   
Six Euro-Denominated Senior Notes [Member]      
Debt Instrument [Line Items]      
Long-term debt 499us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= car_SixEuroDenominatedSeniorNotesMember
  561us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= car_SixEuroDenominatedSeniorNotesMember
Debt Instrument, Maturity Date, Description March 2021    
Six Euro-Denominated Senior Notes [Member] | Long Term Borrowings [Member]      
Debt Instrument [Line Items]      
Debt instrument stated interest percentage 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= car_SixEuroDenominatedSeniorNotesMember
/ car_LongTermBorrowingByTypeAxis
= car_LongTermBorrowingsMember
   
Five and One over Eight Senior Notes [Member]      
Debt Instrument [Line Items]      
Long-term debt 400us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= car_FiveandOneoverEightSeniorNotesMember
  400us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= car_FiveandOneoverEightSeniorNotesMember
Debt Instrument, Maturity Date, Description June 2022    
Five and One over Eight Senior Notes [Member] | Long Term Borrowings [Member]      
Debt Instrument [Line Items]      
Debt instrument stated interest percentage 5.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= car_FiveandOneoverEightSeniorNotesMember
/ car_LongTermBorrowingByTypeAxis
= car_LongTermBorrowingsMember
   
Five And One Over Two Senior Notes [Member]      
Debt Instrument [Line Items]      
Long-term debt 674us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= car_FiveAndOneOverTwoSeniorNotesMember
  674us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= car_FiveAndOneOverTwoSeniorNotesMember
Debt Instrument, Maturity Date, Description April 2023    
Five And One Over Two Senior Notes [Member] | Long Term Borrowings [Member]      
Debt Instrument [Line Items]      
Debt instrument stated interest percentage 5.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= car_FiveAndOneOverTwoSeniorNotesMember
/ car_LongTermBorrowingByTypeAxis
= car_LongTermBorrowingsMember
   
Five And One Over Four Senior Notes [Member]      
Debt Instrument [Line Items]      
Long-term debt 375us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= car_FiveAndOneOverFourSeniorNotesMember
  0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= car_FiveAndOneOverFourSeniorNotesMember
Debt Instrument, Maturity Date, Description March 2025    
Five And One Over Four Senior Notes [Member] | Long Term Borrowings [Member]      
Debt Instrument [Line Items]      
Debt instrument stated interest percentage 5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= car_FiveAndOneOverFourSeniorNotesMember
/ car_LongTermBorrowingByTypeAxis
= car_LongTermBorrowingsMember
   
Senior Notes [Member] | Floating Rate Senior Notes Due December 2017 [Member]      
Debt Instrument [Line Items]      
Long-term debt 248us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= car_FloatingRateSeniorNotesDueDecember2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
  248us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= car_FloatingRateSeniorNotesDueDecember2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Debt Instrument, Maturity Date, Description December 2017    
Percentage Of Margin Aggregate Interest Rate 3.01%car_PercentageOfMarginAggregateInterestRate
/ us-gaap_DebtInstrumentAxis
= car_FloatingRateSeniorNotesDueDecember2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
   
Senior Notes [Member] | Nine And Three Over Four Senior Notes [Member]      
Debt Instrument [Line Items]      
Repayments of Long-term Debt   $ 243us-gaap_RepaymentsOfLongTermDebt
/ us-gaap_DebtInstrumentAxis
= car_NineAndThreeOverFourSeniorNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember