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Vehicle Rental Activities ( Schedule of Components of the Company's Vehicles) (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Property, Plant and Equipment [Abstract] |  |
Rental vehicles | $ 22,020 | $ 20,094
Less: Accumulated depreciation | (2,928) | (3,143)
Rental vehicles net, total | 19,092 | 16,951
Vehicles held for sale | 448 | 594
Vehicle, net investment in lease | 100 | 74
Vehicles, net | $ 19,640 | $ 17,619

X
- 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

X
- 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

X
- 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 Vehicle, Net Investment In Lease Receivables + References No definition available. + Details
Name: | car_VehicleNetInvestmentInLeaseReceivables
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

X
- References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration