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

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

- Definition

Newly Issued European Credit Facility

+ References

No definition available.

+ Details

Name:	car_NewlyIssuedEuropeanCreditFacility
Namespace Prefix:	car_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Investments in notes or bonds that are collateralized by a specific group of underlying assets owned by the issuer of the notes or bonds which are short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

-URI http://asc.fasb.org/extlink&oid=6507016

+ Details

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

- Definition

The percentage points added to the reference rate to compute the variable rate on the lessee's capital lease.

+ References

No definition available.

+ Details

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

- Definition

Date the debt instrument was issued, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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 210.5-02.22(a))

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

+ Details

Name:	us-gaap_DebtInstrumentIssuanceDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- 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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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 210.5-02.22(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

Debt Under Vehicle Programs And Borrowing Arrangements - Additional Information (Detail) In Millions, unless otherwise specified								3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2014 Avis Budget Rental Car Funding Program	Dec. 31, 2014 Canada Debt Borrowings USD ($)	Dec. 31, 2014 International Debt Borrowings USD ($)	Dec. 31, 2013 International Debt Borrowings	Dec. 31, 2014 International Capital Leases USD ($)	Dec. 31, 2014 Budget Truck Financing USD ($)	Mar. 31, 2014 Debt Due To Rental Car Funding [Member] USD ($)	Sep. 30, 2014 Debt Due To Rental Car Funding [Member] USD ($)	Dec. 31, 2014 Debt Due To Rental Car Funding [Member] USD ($)	Dec. 31, 2014 European Rental Fleet Securitization [Member] EUR (€)	Dec. 31, 2013 European Rental Fleet Securitization [Member] EUR (€)
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Leasing Vehicles And Related Assets Pledged As Collateralized Debt	$ 8,000		$ 659,000,000	$ 1,200,000,000		$ 298,000,000	$ 339,000,000			$ 8,000,000,000
Debt Instrument, Issuance Date								Feb. 01, 2014	Jul. 01, 2014
Debt, Weighted Average Interest Rate		3.00%	3.00%	3.00%	4.00%		3.00%
Newly Issued European Credit Facility											290	500
Interest rate on capital leases	2.00%
Asset-Backed Securities, at Carrying Value								$ 675	$ 500
Debt Instrument, Maturity Date										Feb. 01, 2020