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Vehicle Rental Activities (Components Of Vehicle Depreciation And Lease Charges) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Vehicle Rental Activities [Abstract] |  |  |  |
Depreciation expense | $ 540 | $ 547 | $ 1,536 | $ 1,500
Lease charges | 72 | 67 | 192 | 164
(Gain) loss on sale of vehicles, net | (25) | 2 | (35) | 53
Vehicle depreciation and lease charges, net | $ 587 | $ 616 | $ 1,693 | $ 1,717

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- Definition (Gain) Loss On Sale Of Vehicles, Net And Cost Of Vehicle Disposition + References No definition available. + Details
Name: | car_GainLossOnSaleOfVehiclesNetAndCostOfVehicleDisposition
Namespace Prefix: | car_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Vehicle Depreciation And Lease Charges, Net + References No definition available. + Details
Name: | car_VehicleDepreciationAndLeaseChargesNet
Namespace Prefix: | car_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of depreciation expense recorded on rental vehicles. + References No definition available. + Details
Name: | car_VehicleDepreciationExpense
Namespace Prefix: | car_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of lease charges recorded on rental vehicles. + References No definition available. + Details
Name: | car_VehicleLeaseCharges
Namespace Prefix: | car_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Vehicle Rental Activities [Abstract] + References No definition available. + Details
Name: | car_VehicleRentalActivitiesAbstract
Namespace Prefix: | car_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration