| Cover | Nov. 08, 2024 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Nov. 08, 2024 |
| Entity File Number | 1-5324 |
| Entity Registrant Name | EVERSOURCE ENERGY |
| Entity Central Index Key | 0000072741 |
| Entity Tax Identification Number | 04-2147929 |
| Entity Incorporation, State or Country Code | MA |
| Entity Address, Address Line One | 300 Cadwell Drive |
| Entity Address, City or Town | Springfield |
| Entity Address, State or Province | MA |
| Entity Address, Postal Zip Code | 01104 |
| City Area Code | 800 |
| Local Phone Number | 286-5000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Shares, $5.00 par value per share |
| Trading Symbol | ES |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| The Connecticut Light And Power Company [Member] | |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Nov. 08, 2024 |
| Entity File Number | 0-00404 |
| Entity Registrant Name | THE CONNECTICUT LIGHT AND POWER COMPANY |
| Entity Central Index Key | 0000023426 |
| Entity Tax Identification Number | 06-0303850 |
| Entity Incorporation, State or Country Code | CT |
| Entity Address, Address Line One | 107 Selden Street |
| Entity Address, City or Town | Berlin |
| Entity Address, State or Province | CT |
| Entity Address, Postal Zip Code | 06037-1616 |
| City Area Code | 800 |
| Local Phone Number | 286-5000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Nstar Electric Company [Member] | |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Nov. 08, 2024 |
| Entity File Number | 1-02301 |
| Entity Registrant Name | NSTAR ELECTRIC COMPANY |
| Entity Central Index Key | 0000013372 |
| Entity Tax Identification Number | 04-1278810 |
| Entity Incorporation, State or Country Code | MA |
| Entity Address, Address Line One | 800 Boylston Street |
| Entity Address, City or Town | Boston |
| Entity Address, State or Province | MA |
| Entity Address, Postal Zip Code | 02199 |
| City Area Code | 800 |
| Local Phone Number | 286-5000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Public Service Company Of New Hampshire [Member] | |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Nov. 08, 2024 |
| Entity File Number | 1-6392 |
| Entity Registrant Name | PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE |
| Entity Central Index Key | 0000315256 |
| Entity Tax Identification Number | 02-0181050 |
| Entity Incorporation, State or Country Code | NH |
| Entity Address, Address Line One | Energy Park |
| Entity Address, Address Line Two | 780 North Commercial Street |
| Entity Address, City or Town | Manchester |
| Entity Address, State or Province | NH |
| Entity Address, Postal Zip Code | 03101-1134 |
| City Area Code | 800 |
| Local Phone Number | 286-5000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
