| Document and Entity Information | Dec. 08, 2020 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0000723612 |
| Document Type | 8-K |
| Document Period End Date | Dec. 8, 2020 |
| Entity Registrant Name | Avis Budget Group, Inc. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-10308 |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, par value $0.01 |
| Trading Symbol | CAR |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
