Document and Entity Information - shares
6 Months Ended
Jun. 30, 2019
Jul. 31, 2019
Cover page.    
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 Jun. 30, 2019  
Entity File Number 001-10308  
Document Type 10-Q  
Amendment Flag false  
Document Fiscal Year Focus 2019  
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 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   75,981,420