Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Jul. 31, 2018
Document Documentand Entity Information [Abstract]
Document Period End Date	Jun. 30, 2018
Document Type	10-Q
Amendment Flag	false
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2
Trading Symbol	CAR
Entity Registrant Name	AVIS BUDGET GROUP, INC.
Entity Central Index Key	0000723612
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		79,194,210