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v3.20.1

Segment Information (Narrative) (Detail) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Assets Under Vehicle Programs | $ 14,300 | $ 13,815
Americas [Member] |  |
Segment Reporting Information [Line Items] |  |
Segment Assets Exclusive Of Assets Under Vehicle Program | 6,200 |
Assets Under Vehicle Programs | 11,600 | 10,500
International [Member] |  |
Segment Reporting Information [Line Items] |  |
Segment Assets Exclusive Of Assets Under Vehicle Program | 2,900 | 3,000
Assets Under Vehicle Programs | $ 2,700 | $ 3,300

X
- Definition Assets Under Vehicle Programs + References No definition available. + Details
Name: | car_AssetsUnderVehiclePrograms
Namespace Prefix: | car_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Segment assets exclusive of assets under vehicle program + References No definition available. + Details
Name: | car_SegmentAssetsExclusiveOfAssetsUnderVehicleProgram
Namespace Prefix: | car_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=srt_AmericasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=car_InternationalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |