| Document and Entity Information | Feb. 25, 2022 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001066656 |
| Document Type | 8-K |
| Document Period End Date | Feb. 25, 2022 |
| Entity Registrant Name | CERES CLASSIC L.P. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 000-25603 |
| Entity Tax Identification Number | 13-4018068 |
| Entity Address, Address Line One | c/o Ceres Managed Futures LLC |
| Entity Address, Address Line Two | 522 Fifth Avenue |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10036 |
| City Area Code | (855) |
| Local Phone Number | 672-4468 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
