Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2020	Oct. 27, 2020
Cover [Abstract]
Title of 12(b) Security	Common Stock, Par Value $0.01
Document Transition Report	false
Document Quarterly Report	true
Entity Incorporation, State or Country Code	DE
Document Period End Date	Sep. 30, 2020
Entity File Number	001-10308
Document Type	10-Q
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Trading Symbol	CAR
Entity Registrant Name	Avis Budget Group, Inc.
Entity Central Index Key	0000723612
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Filer Category	Large Accelerated Filer
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
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding		69,683,361