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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, 2018 | Mar. 31, 2017
Vehicle Rental Activities [Abstract] |  |
Depreciation expense | $ 460 | $ 437
Lease charges | 56 | 43
(Gain) loss on sale of vehicles, net | (1) | 24
Vehicle depreciation and lease charges, net | $ 515 | $ 504

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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 The expense recognized in the current period that allocates the cost of a tangible asset used in providing revenue generating services over the asset's useful life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration