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Vehicle Rental Activities (Components Of The Company's Vehicles) (Detail) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016
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Vehicle Rental Activities [Abstract] |  |  |
Rental vehicles | $ 12,993 | $ 10,937 |
Less: Accumulated depreciation | (1,627) | (1,454) |
Rental Vehicles Net, Total | 11,366 | 9,483 |
Vehicles held for sale | 435 | 981 |
Vehicles, net | 11,801 | $ 10,464 |
Accounts Payable, Other, Current | 231 |  | $ 164
Other Receivables | $ 707 |  | $ 586

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- Definition Accumulated depreciation recorded through the balance sheet date for vehicles involved in rental activities. + References No definition available. + Details
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- Definition The cost of vehicles used in rental activities. + References No definition available. + Details
Name: | car_RentalVehicles
Namespace Prefix: | car_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Rental Vehicles Net + References No definition available. + Details
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- Definition Vehicle Rental Activities [Abstract] + References No definition available. + Details
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- Definition The recorded value of rental vehicles held for sale, net of accumulated depreciation. + References No definition available. + Details
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Balance Type: | debit
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- Definition Total carrying value of rental vehicles classified as program assets not otherwise defined in the taxonomy. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Amount of obligations incurred classified as other, payable within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6935-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount due from parties in nontrade transactions, classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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