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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 | 3 Months Ended
--- | --- | ---
May 31, 2023 | Mar. 31, 2023 | Jan. 31, 2023 | Mar. 31, 2023 | Mar. 31, 2022
Debt Instrument [Line Items] |  |  |  |  |
Retirement of Long-Term Debt |  |  |  | $ (400,000) | $ (770,000)
CL&P |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Retirement of Long-Term Debt |  |  |  | $ (400,000) | $ 0
CL&P | First Mortgage | CL&P 2023 Series A First Mortgage Bonds |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate, stated percentage |  |  | 5.25% |  |
Issuances |  |  | $ 500,000 |  |
CL&P | First Mortgage | CL&P 2013 Series A First Mortgage Bonds |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate, stated percentage |  |  | 2.50% |  |
Retirement of Long-Term Debt |  |  | $ (400,000) |  |
PSNH | First Mortgage | PSNH Series W First Mortgage Bonds |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate, stated percentage |  |  | 5.15% |  |
Issuances |  |  | $ 300,000 |  |
Eversource Parent | Senior Notes | Eversource Parent Series Z Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate, stated percentage |  | 5.45% |  | 5.45% |
Issuances |  | $ 750,000 |  |  |
Eversource Parent | Senior Notes | Eversource Parent Series F Senior Notes | Forecast |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate, stated percentage | 2.80% |  |  |  |
Eversource Parent | Senior Notes | Eversource Parent Series F Senior Notes | Subsequent Event | Forecast |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Retirement of Long-Term Debt | $ (450,000) |  |  |  |

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