| Document and Entity Information Document | Jun. 10, 2021 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Jun. 10, 2021 |
| Entity File Number | 001-01910 |
| Entity Registrant Name | BALTIMORE GAS AND ELECTRIC COMPANY |
| Entity Tax Identification Number | 52-0280210 |
| Entity Incorporation, State or Country Code | MD |
| Entity Address, Address Line One | 2 Center Plaza |
| Entity Address, Address Line Two | 110 West Fayette Street |
| Entity Address, City or Town | Baltimore |
| Entity Address, State or Province | MD |
| Entity Address, Postal Zip Code | 21201-3708 |
| City Area Code | (410) |
| Local Phone Number | 234-5000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Central Index Key | 0000009466 |
| Amendment Flag | false |
| Entity Emerging Growth Company | false |
