Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]

No definition available.

Name:	car_DebtUnderVehicleProgramsAndBorrowingArrangementsLineItems
Namespace Prefix:	car_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ 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 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399

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 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DeferredFinanceCostsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

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

- Details

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

- Details

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

- Details

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

- Details

Name:	us-gaap_LongtermDebtTypeAxis=car_OtherDebtUnderVehicleProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=car_DebtUnderVehicleProgramsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Schedule Of Debt Under Vehicle Programs (Detail) - USD ($) $ in Millions	1 Months Ended
	Dec. 31, 2020	Jul. 31, 2020	Feb. 29, 2020	Jul. 31, 2019	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Debt under vehicle programs					$ 8,860	$ 8,056
Deferred Finance Costs, Net						(127)	$ (134)
Debt Due To Rental Car Funding [Member]
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Debt Instrument, Maturity Date	Dec. 01, 2020	Jul. 01, 2020	Feb. 01, 2020	Jul. 01, 2019
Debt under vehicle programs					6,837	6,340
Deferred Finance Costs, Net					$ (41)	(44)
Americas Debt Borrowings [Member]
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Debt, Weighted Average Interest Rate					3.00%
Debt under vehicle programs					$ 643	746
International Debt Borrowings
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Debt, Weighted Average Interest Rate					3.00%
Debt under vehicle programs					$ 1,187	685
International Capital Leases
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Debt under vehicle programs					238	314
Other
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Debt under vehicle programs					8	31
Debt Under Vehicle Programs [Member]
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Debt under vehicle programs					8,913
Deferred Finance Costs, Net					$ (53)	$ (60)