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Schedule Of Available Funding Under Vehicle Programs (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Debt Under Vehicle Programs And Borrowing Arrangements [Line Items] |  |
Leasing Vehicles And Related Assets Pledged As Collateralized Debt | $ 8,200 |
Debt under vehicle programs | $ 9,221 | $ 8,878
Avis Budget Rental Car Funding Program [Member] |  |
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items] |  |
Debt, Weighted Average Interest Rate | 3.00% | 3.00%
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 | 9,296 |
Debt under vehicle programs | 6,516 | $ 6,733
Available Capacity | $ 2,780 |
Americas Debt Borrowings [Member] |  |
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items] |  |
Debt, Weighted Average Interest Rate | 3.00% | 4.00%
Leasing Vehicles And Related Assets Pledged As Collateralized Debt | $ 900 |
Total Capacity | 924 |
Debt under vehicle programs | 660 | $ 577
Available Capacity | $ 264 |
International Debt Borrowings |  |
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items] |  |
Debt, Weighted Average Interest Rate | 2.00% | 2.00%
Leasing Vehicles And Related Assets Pledged As Collateralized Debt | $ 2,300 |
Total Capacity | 2,942 |
Debt under vehicle programs | 1,942 | $ 1,449
Available Capacity | 1,000 |
International Capital Leases |  |
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items] |  |
Leasing Vehicles And Related Assets Pledged As Collateralized Debt | 200 |
Total Capacity | 169 |
Debt under vehicle programs | 146 | 162
Available Capacity | 23 |
Other |  |
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items] |  |
Total Capacity | 1 |
Debt under vehicle programs | 1 | $ 7
Available Capacity | 0 |
Debt Under Vehicle Programs [Member] |  |
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items] |  |
Total Capacity | 13,332 |
Debt under vehicle programs | 9,265 |
Available Capacity | $ 4,067 |

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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
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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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- Details
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- Details
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- Details
Name: | us-gaap_LongtermDebtTypeAxis=car_AmericasDebtBorrowingsMember
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- Details
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- Details
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- Details
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- Details
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