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Vehicle Rental Activities (Components Of Vehicle Depreciation And Lease Charges) (Detail) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Vehicle Rental Activities [Abstract] |  |
Depreciation expense | $ 414 | $ 436
Lease charges | 56 | 57
(Gain) loss on sale of vehicles, net | (11) | (8)
Vehicle depreciation and lease charges, net | $ 459 | $ 485

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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 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

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- 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

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- Definition Amount of expense for allocation of cost of tangible asset over its useful life directly used in production of good and rendering of service. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(b)(2)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
Name: | us-gaap_CostOfGoodsAndServicesSoldDepreciation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration