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Vehicle Rental Activities - Components of Company's Vehicles (Detail) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure Components Of Companys Vehicles [Abstract] |  |
Rental vehicles | $ 14,612 | $ 9,210
Less: Accumulated depreciation | (1,911) | (1,337)
Rental Vehicles Net, Total | 12,701 | 7,873
Vehicles held for sale | 165 | 280
Vehicles, net | $ 12,866 | $ 8,153

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- Definition Accumulated depreciation recorded through the balance sheet date for vehicles involved in rental activities. + References No definition available. + Details
Name: | car_AccumulatedDepreciation
Namespace Prefix: | car_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Disclosure - Components of Company's Vehicles [Abstract] + References No definition available. + Details
Name: | car_DisclosureComponentsOfCompanysVehiclesAbstract
Namespace Prefix: | car_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The cost of vehicles used in rental activities. + References No definition available. + Details
Name: | car_RentalVehicles
Namespace Prefix: | car_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Rental Vehicles Net + References No definition available. + Details
Name: | car_RentalVehiclesNet
Namespace Prefix: | car_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The recorded value of rental vehicles held for sale, net of accumulated depreciation. + References No definition available. + Details
Name: | car_VehiclesHeldForSale
Namespace Prefix: | car_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Total carrying value of rental vehicles classified as program assets not otherwise defined in the taxonomy. + References No definition available. + Details
Name: | car_VehiclesNet
Namespace Prefix: | car_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant