Cover - USD ($)	12 Months Ended
	Dec. 31, 2021	Feb. 11, 2022	Jun. 30, 2021
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2021
Current Fiscal Year End Date	--12-31
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 $.01
Trading Symbol	CAR
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
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 Public Float			$ 3,950,137,684
Entity Common Stock, Shares Outstanding		53,767,484
Documents Incorporated by Reference	Portions of the registrant’s definitive proxy statement to be mailed to stockholders in connection with the registrant’s 2022 annual meeting of stockholders (the “Annual Proxy Statement”) are incorporated by reference into Part III hereof.
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Entity Central Index Key	0000723612
ICFR Auditor Attestation Flag	true