Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

Name:	us-gaap_PaymentsForRestructuring
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 5.P.4(b))

-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 5.P.3)

-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section P

-Subsection 3, 4

+ Details

Name:	us-gaap_RestructuringCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 5.P.4(b))

-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section P

-Subsection 3, 4

+ Details

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

- Details

Name:	us-gaap_RestructuringReserveRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=car_A2011AvisEuropeRestructuringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=car_A2014T15RestructuringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=car_FacilityRelatedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=car_InternationalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=car_PersonnelRelatedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=us-gaap_AmericasMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Restructuring (Summary Of Changes To Restructuring-Related Liabilities) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Restructuring Reserve [Roll Forward]
March 31, 2015	$ 17us-gaap_RestructuringReserve
Restructuring expense	1us-gaap_RestructuringCharges	7us-gaap_RestructuringCharges
Balance as of March 31, 2015	9us-gaap_RestructuringReserve
Americas
Restructuring Reserve [Roll Forward]
March 31, 2015			4
Balance as of March 31, 2015	1		4
International
Restructuring Reserve [Roll Forward]
March 31, 2015			13
Balance as of March 31, 2015	8		13
Personnel Related
Restructuring Reserve [Roll Forward]
March 31, 2015			14
Balance as of March 31, 2015	7		14
Facility Related
Restructuring Reserve [Roll Forward]
March 31, 2015			3
Balance as of March 31, 2015	2		3
2014 T15 Restructuring [Member]
Restructuring Reserve [Roll Forward]
Restructuring expense	1
Payment for Restructuring	(4)
2014 T15 Restructuring [Member] \| Americas
Restructuring Reserve [Roll Forward]
Restructuring expense	1
Payment for Restructuring	(3)
2014 T15 Restructuring [Member] \| International
Restructuring Reserve [Roll Forward]
Restructuring expense	0
Payment for Restructuring	(1)
2014 T15 Restructuring [Member] \| Personnel Related
Restructuring Reserve [Roll Forward]
Restructuring expense	1
Payment for Restructuring	(4)
2014 T15 Restructuring [Member] \| Facility Related
Restructuring Reserve [Roll Forward]
Restructuring expense	0
Payment for Restructuring	0
2011 Avis Europe Restructuring [Member]
Restructuring Reserve [Roll Forward]
Payment for Restructuring	(5)
2011 Avis Europe Restructuring [Member] \| Americas
Restructuring Reserve [Roll Forward]
Payment for Restructuring	(1)
2011 Avis Europe Restructuring [Member] \| International
Restructuring Reserve [Roll Forward]
Payment for Restructuring	(4)
2011 Avis Europe Restructuring [Member] \| Personnel Related
Restructuring Reserve [Roll Forward]
Payment for Restructuring	(4)
2011 Avis Europe Restructuring [Member] \| Facility Related
Restructuring Reserve [Roll Forward]
Payment for Restructuring	$ (1)