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v3.10.0.1

Subsequent Events - Additional Information (Detail) - Debt Due To Rental Car Funding [Member] - USD ($) $ in Millions | Feb. 01, 2019 | Dec. 31, 2018
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Subsequent Event [Line Items] |  |
Asset-Backed Securities, at Carrying Value |  | $ 8,883
Subsequent Event |  |
Subsequent Event [Line Items] |  |
Asset-Backed Securities, at Carrying Value | $ 600 |
Debt, Weighted Average Interest Rate | 4.00% |

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- Definition Maximum borrowing capacity under the vehicle program without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the program. + References No definition available. + Details
Name: | car_VehicleProgramDebtTotalCapacity
Namespace Prefix: | car_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
Name: | us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |