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Debt Under Vehicle Programs And Borrowing Arrangements - Additional Information (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
European Rental Fleet Securitization [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Newly Issued European Credit Facility | € 150 | € 250 | € 400 | € 210 | € 290 | € 500

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- Definition Newly Issued European Credit Facility + References No definition available. + Details
Name: | car_NewlyIssuedEuropeanCreditFacility
Namespace Prefix: | car_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=car_EuropeanRentalFleetSecuritizationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |