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Segment Information (Narrative) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |
Threshold litigation amount | $ 5 |  |
Assets under vehicle programs |  | $ 23,729 | $ 22,979
Americas |  |  |
Segment Reporting Information [Line Items] |  |  |
Assets under vehicle programs |  | $ 20,200 | $ 19,300

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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

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- Definition Earnings Before Income Taxes Depreciation Amortization, Threshold Litigation Amount + References No definition available. + Details
Name: | car_EarningsBeforeIncomeTaxesDepreciationAmortizationThresholdLitigationAmount
Namespace Prefix: | car_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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

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