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v3.19.2

Subsequent Events (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Aug. 01, 2019 | Jun. 30, 2019
--- | --- | --- | ---
Subsequent Event [Line Items] |  |  |
Stock Repurchase Program, Authorized Amount |  |  | $ 1,700
Subsequent Event [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Stock Repurchase Program, Authorized Amount |  | $ 100 |
Five And One Over Four Senior Notes [Member] | Senior Notes [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Debt Instrument, Face Amount |  |  | $ 400
Five And One Over Four Senior Notes [Member] | Senior Notes [Member] | Subsequent Event [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Debt Instrument, Face Amount | $ 400 |  |
Five And One Over Two Senior Notes [Member] | Senior Notes [Member] | Subsequent Event [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Debt Instrument, Repurchase Amount | $ 400 |  |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Fair value amount of debt instrument that was repurchased. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentRepurchaseAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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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_DebtInstrumentAxis=car_FiveAndOneOverFourSeniorNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |