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v3.21.2

Segment Information (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Segment Reporting Information [Line Items] |  |  |  |  |
Unprecedented personal-injury and other legal matters, net | $ 5 | $ 0 | $ (6) | $ 0 |
Assets under vehicle programs | 13,022 |  | 13,022 |  | $ 9,173
Americas |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Assets under vehicle programs | 10,400 |  | 10,400 |  | 7,200
International |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Assets under vehicle programs | $ 2,600 |  | $ 2,600 |  | $ 2,000

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- Definition Assets Under Vehicle Programs + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Unprecedented Personal-Injury And Other Legal Matters, Net + References No definition available. + Details
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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
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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