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v3.8.0.1

Restructuring Other Related Charges (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2017 USD ($) Employee
Other Related Charges [Abstract] |
Other Nonrecurring Expense | $ 7
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost | 2
Charges related to voluntary termination program | $ 14
Charges related to voluntary termination program, Expected Number of Positions Eliminated | Employee | 325
Charges related to voluntary termination program, Number of Positions Eliminated | Employee | 255

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- Definition Charges related to CFO Departure + References No definition available. + Details
Name: | car_ChargesrelatedtoCFODeparture
Namespace Prefix: | car_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Charges related to voluntary termination program + References No definition available. + Details
Name: | car_Chargesrelatedtovoluntaryterminationprogram
Namespace Prefix: | car_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Charges related to voluntary termination program, Expected Number of Positions Eliminated + References No definition available. + Details
Name: | car_ChargesrelatedtovoluntaryterminationprogramExpectedNumberofPositionsEliminated
Namespace Prefix: | car_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Charges related to voluntary termination program, Number of Positions Eliminated + References No definition available. + Details
Name: | car_ChargesrelatedtovoluntaryterminationprogramNumberofPositionsEliminated
Namespace Prefix: | car_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Other Related Charges [Abstract] + References No definition available. + Details
Name: | car_OtherRelatedChargesAbstract
Namespace Prefix: | car_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Additional share-based compensation cost recognized as a result of an occurrence of an event that accelerates its recognition. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration