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Schedule Of Available Funding Under Vehicle Programs (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Debt Under Vehicle Programs And Borrowing Arrangements [Line Items] |  |
Leasing Vehicles And Related Assets Pledged As Collateralized Debt | $ 6,400 |
Debt under vehicle programs | $ 6,857 | $ 11,068
Avis Budget Rental Car Funding Program [Member] |  |
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items] |  |
Debt, Weighted Average Interest Rate | 3.17% | 3.16%
Debt Due To Rental Car Funding [Member] |  |
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items] |  |
Leasing Vehicles And Related Assets Pledged As Collateralized Debt | $ 8,000 |
Total Capacity | 7,921 |
Debt under vehicle programs | 5,116 | $ 7,975
Available Capacity | $ 2,805 |
Americas Debt Borrowings [Member] |  |
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items] |  |
Debt, Weighted Average Interest Rate | 2.98% | 2.87%
Leasing Vehicles And Related Assets Pledged As Collateralized Debt | $ 900 |
Total Capacity | 759 |
Debt under vehicle programs | 509 | $ 827
Available Capacity | $ 250 |
International Debt Borrowings |  |
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items] |  |
Debt, Weighted Average Interest Rate | 2.17% | 1.87%
Leasing Vehicles And Related Assets Pledged As Collateralized Debt | $ 2,300 |
Total Capacity | 2,884 |
Debt under vehicle programs | 1,115 | $ 2,100
Available Capacity | 1,769 |
International Capital Leases |  |
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items] |  |
Leasing Vehicles And Related Assets Pledged As Collateralized Debt | 200 |
Total Capacity | 221 |
Debt under vehicle programs | 162 | $ 215
Available Capacity | 59 |
Debt Under Vehicle Programs [Member] |  |
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items] |  |
Total Capacity | 11,785 |
Debt under vehicle programs | 6,902 |
Available Capacity | $ 4,883 |

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- Definition Debt Under Vehicle Programs And Borrowing Arrangements [Line Items] + References No definition available. + Details
Name: | car_DebtUnderVehicleProgramsAndBorrowingArrangementsLineItems
Namespace Prefix: | car_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Leasing Vehicles And Related Assets, Pledged As Collateralized Debt + References No definition available. + Details
Name: | car_LeasingVehiclesAndRelatedAssetsPledgedAsCollateralizedDebt
Namespace Prefix: | car_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of borrowing capacity currently available under the vehicle program (current borrowing capacity less the amount of borrowings outstanding). + References No definition available. + Details
Name: | car_VehicleProgramDebtAvailableCapacity
Namespace Prefix: | car_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Maximum borrowing capacity under the vehicle program without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the program. + References No definition available. + Details
Name: | car_VehicleProgramDebtTotalCapacity
Namespace Prefix: | car_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Vehicle Program Outstanding Debt + References No definition available. + Details
Name: | car_VehicleProgramOutstandingDebt
Namespace Prefix: | car_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=car_DebtDueToRentalCarFundingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=car_AmericasDebtBorrowingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=car_InternationalDebtBorrowingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=car_InternationalCapitalLeasesDomain
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=car_DebtUnderVehicleProgramsMember
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