Cover - shares	9 Months Ended
	Sep. 30, 2021	Oct. 29, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
Document Transition Report	false
Entity File Number	001-10308
Entity Registrant Name	Avis Budget Group, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	06-0918165
Entity Address, Address Line One	6 Sylvan Way
Entity Address, City or Town	Parsippany,
Entity Address, State or Province	NJ
Entity Address, Postal Zip Code	07054
City Area Code	(973)
Local Phone Number	496-4700
Title of 12(b) Security	Common Stock, Par Value $0.01
Trading Symbol	CAR
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		56,447,571
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Entity Central Index Key	0000723612
Current Fiscal Year End Date	--12-31