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Basis of Presentation Deferred Revenue Rollforward in Basis of Presentation (Details) $ in Millions | Mar. 31, 2020 USD ($)
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Accounts Payable and Accrued Liabilities [Member] |
Deferred Revenue Rollforward [Line Items] |
Deferred Revenue | $ 24

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- Definition [Line Items] for Deferred Revenue Rollforward [Table] + References No definition available. + Details
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Namespace Prefix: | car_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(5)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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