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v3.21.2

Segment Information (Narrative) (Detail) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Assets under vehicle programs | $ 12,796 | $ 9,173
Americas |  |
Segment Reporting Information [Line Items] |  |
Assets under vehicle programs | 10,300 | 7,200
International |  |
Segment Reporting Information [Line Items] |  |
Assets under vehicle programs | $ 2,500 | $ 2,000

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- 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 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: | srt_StatementGeographicalAxis=srt_AmericasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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