Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2020	Feb. 12, 2021	Jun. 30, 2020
Entity Listings [Line Items]
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	7054
Document Transition Report	false
Document Annual Report	true
Title of 12(b) Security	Common Stock, Par Value $.01
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2020
Document Fiscal Year Focus	2020
Trading Symbol	CAR
Document Fiscal Period Focus	FY
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		69,842,179
Security Exchange Name	NASDAQ
City Area Code	(973)
Local Phone Number	496-4700
Entity Registrant Name	AVIS BUDGET GROUP, INC.
Entity Central Index Key	0000723612
Entity File Number	001-10308
Entity Tax Identification Number	06-0918165
Entity Incorporation, State or Country Code	DE
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Public Float			$ 1,199,360,829