Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2019
Feb. 14, 2020
Jun. 30, 2019
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 07054    
Document Transition Report false    
Document Annual Report true    
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Entity Interactive Data Current Yes    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   74,356,513  
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     $ 2,564,141,255
Nasdaq [Member] | Common Stock [Member]      
Entity Listings [Line Items]      
Title of 12(b) Security Common Stock, Par Value $.01    
Trading Symbol CAR    
Security Exchange Name NASDAQ    
None [Member] | Rights [Member]      
Entity Listings [Line Items]      
Title of 12(b) Security Common Stock Purchase Rights    
No Trading Symbol Flag true    
Security Exchange Name NONE