| Cover | Jun. 24, 2021 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Jun. 24, 2021 |
| Entity File Number | 001-37591 |
| Entity Registrant Name | EASTERN ENERGY GAS HOLDINGS, LLC |
| Entity Incorporation, State or Country Code | VA |
| Entity Address, Address Line One | 6603 West Broad Street |
| Entity Address, City or Town | Richmond |
| Entity Address, State or Province | VA |
| Entity Address, Postal Zip Code | 23230 |
| City Area Code | 804 |
| Local Phone Number | 613-5100 |
| Entity Tax Identification Number | 46-3639580 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001603291 |
| Amendment Flag | false |
