| Cover Page | Jul. 09, 2021 |
| Entity Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Jul. 9, 2021 |
| Entity Registrant Name | Consolidated Edison, Inc |
| Entity Incorporation, State or Country Code | NY |
| Entity File Number | 1-14514 |
| Entity Tax Identification Number | 13-3965100 |
| Entity Address, Address Line One | 4 Irving Place, |
| Entity Address, City or Town | New York, |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10003 |
| City Area Code | 212 |
| Local Phone Number | 460-4600 |
| Title of 12(b) Security | Common Shares ($.10 par value) |
| Trading Symbol | ED |
| Security Exchange Name | NYSE |
| 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 | 0001047862 |
| Amendment Flag | false |
| CECONY | |
| Entity Information [Line Items] | |
| Entity Central Index Key | 0000023632 |
