| Document and Entity Information | Dec. 03, 2024 |
| Cover [Abstract] | |
| Entity Registrant Name | CONSOLIDATED EDISON INC |
| Amendment Flag | false |
| Entity Central Index Key | 0001047862 |
| Document Type | 8-K |
| Document Period End Date | Dec. 03, 2024 |
| Entity Incorporation State 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Trading Symbol | ED |
| Security Exchange Name | NYSE |
| Security 12b Title | Common Shares ($.10 par value) |
| Entity Emerging Growth Company | false |
