v3.10.0.1
Document and Entity Information - shares
9 Months Ended
Sep. 30, 2018
Oct. 31, 2018
Document Documentand Entity Information [Abstract]    
Document Period End Date Sep. 30, 2018  
Document Type 10-Q  
Amendment Flag false  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q3  
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   77,346,138