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SHORT-TERM AND LONG-TERM DEBT - Summary of Long-Term Debt Issuance and Repayments (Details) - USD ($) $ in Thousands | 1 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 31, 2024 | Jun. 30, 2024 | May 31, 2024 | Apr. 30, 2024 | Jan. 31, 2024 | Jun. 30, 2024 | Jun. 30, 2023
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  |  | $ (900,000) | $ (853,000)
Senior Notes | Eversource Parent Series DD Senior Notes | Eversource Parent |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate, stated percentage (in percent) |  |  |  |  | 5.00% |  |
Issuances |  |  |  |  | $ 350,000 |  |
Senior Notes | Eversource Parent Series EE Senior Notes | Eversource Parent |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate, stated percentage (in percent) |  |  |  |  | 5.50% |  |
Issuances |  |  |  |  | $ 650,000 |  |
Senior Notes | Eversource Parent Series FF Senior Notes | Eversource Parent |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate, stated percentage (in percent) |  |  |  | 5.85% |  |  |
Issuances |  |  |  | $ 700,000 |  |  |
Senior Notes | Eversource Parent Series GG Senior Notes | Eversource Parent |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate, stated percentage (in percent) |  |  |  | 5.95% |  |  |
Issuances |  |  |  | $ 700,000 |  |  |
Senior Notes | Eversource Parent Series X Senior Notes | Eversource Parent |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate, stated percentage (in percent) |  | 4.20% |  |  |  | 4.20% |
Repayments of long-term debt |  | $ (900,000) |  |  |  |  |
CL&P |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  |  | $ 0 | $ (400,000)
CL&P | First Mortgage | CL&P 2024 Series A First Mortgage Bonds |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate, stated percentage (in percent) |  |  |  |  | 4.65% |  |
Issuances |  |  |  |  | $ 350,000 |  |
PSNH | First Mortgage | PSNH Series X First Mortgage Bonds |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate, stated percentage (in percent) |  |  |  | 5.35% |  |  |
Issuances |  |  |  | $ 300,000 |  |  |
NSTAR Electric | Unsecured Debt | NSTAR Electric 2024 Debentures |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate, stated percentage (in percent) |  |  | 5.40% |  |  |  |
Issuances |  |  | $ 600,000 |  |  |  |
Yankee Gas | First Mortgage | Yankee Gas Series W First Mortgage Bonds | Subsequent Event |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate, stated percentage (in percent) | 5.50% |  |  |  |  |  |
Issuances | $ 90,000 |  |  |  |  |  |
Yankee Gas | First Mortgage | Yankee Gas Series X First Mortgage Bonds | Subsequent Event |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate, stated percentage (in percent) | 5.74% |  |  |  |  |  |
Issuances | $ 90,000 |  |  |  |  |  |
NSTAR Gas | First Mortgage | NSTAR Gas Series W First Mortgage Bonds |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate, stated percentage (in percent) |  | 5.29% |  |  |  | 5.29% |
Issuances |  | $ 160,000 |  |  |  |  |
NSTAR Gas | First Mortgage | NSTAR Gas Series X First Mortgage Bonds |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate, stated percentage (in percent) |  | 5.48% |  |  |  | 5.48% |
Issuances |  | $ 40,000 |  |  |  |  |

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