Vehicle Rental Activities (Components Of The Company's Vehicles) (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Vehicle Rental Activities [Abstract]
Rental vehicles	$ 11,661car_RentalVehicles	$ 11,006car_RentalVehicles
Less: Accumulated depreciation	(1,335)car_AccumulatedDepreciation	(1,465)car_AccumulatedDepreciation
Rental Vehicles Net, Total	10,326car_RentalVehiclesNet	9,541car_RentalVehiclesNet
Vehicles held for sale	451car_VehiclesHeldForSale	674car_VehiclesHeldForSale
Vehicles, net	10,777car_VehiclesNet	10,215car_VehiclesNet
Accounts Payable, Other, Current	428us-gaap_AccountsPayableOtherCurrent		498us-gaap_AccountsPayableOtherCurrent
Other Receivables	$ 246us-gaap_OtherReceivables		$ 231us-gaap_OtherReceivables

Accumulated depreciation recorded through the balance sheet date for vehicles involved in rental activities.

No definition available.

Name:	car_AccumulatedDepreciation
Namespace Prefix:	car_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

- Definition

Rental Vehicles Net

+ References

No definition available.

+ Details

Name:	car_RentalVehiclesNet
Namespace Prefix:	car_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

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

- Definition

The recorded value of rental vehicles held for sale, net of accumulated depreciation.

+ References

No definition available.

+ Details

Name:	car_VehiclesHeldForSale
Namespace Prefix:	car_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Total carrying value of rental vehicles classified as program assets not otherwise defined in the taxonomy.

+ References

No definition available.

+ Details

Name:	car_VehiclesNet
Namespace Prefix:	car_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of obligations incurred and payable, which are not elsewhere specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19

-Subparagraph a

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Current Liabilities

-URI http://asc.fasb.org/extlink&oid=6509677

Reference 3: 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=28358313&loc=d3e6935-107765

Reference 4: 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

Name:	us-gaap_AccountsPayableOtherCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying amounts due as of the balance sheet date from parties or arising from transactions not otherwise specified in the taxonomy.

+ 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

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 8

-Article 5

+ Details

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