| Cover | Aug. 01, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K/A |
| Amendment Flag | true |
| Amendment Description | Amendment No. 1 |
| Document Period End Date | Aug. 1, 2021 |
| Entity File Number | 000-56027 |
| Entity Registrant Name | The Greater Cannabis Company, Inc. |
| Entity Central Index Key | 0001695473 |
| Entity Tax Identification Number | 30-0842570 |
| Entity Incorporation, State or Country Code | FL |
| Entity Address, Address Line One | 15 Walker Ave |
| Entity Address, Address Line Two | Suite 101 |
| Entity Address, City or Town | Baltimore |
| Entity Address, State or Province | MD |
| Entity Address, Postal Zip Code | 21208 |
| City Area Code | (443) |
| Local Phone Number | 738-4051 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Trading Symbol | GCAN |
