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LONG-TERM DEBT - Narrative (Details) - USD ($) $ in Thousands | Feb. 08, 2024 | Dec. 31, 2023 | Nov. 21, 2023 | Jun. 07, 2023 | Dec. 31, 2022 | Nov. 30, 2022 | Jun. 14, 2022
--- | --- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt |  | $ 23,588,616 |  |  | $ 19,723,994 |  |
Interest included in payment to settle spent nuclear fuel obligation |  | 9,500 |  |  | 8,800 |  |
CL&P |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt |  | 4,814,429 |  |  | 4,216,488 |  |
PSNH |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt |  | 1,431,591 |  |  | 1,134,914 |  |
NSTAR Electric |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt |  | 4,496,947 |  |  | 4,345,085 |  |
Line of Credit | NSTAR Gas |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Amount of long-term debt requested for issuance |  |  |  |  |  |  | $ 325,000
Line of Credit | CL&P |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Amount of long-term debt requested for issuance |  |  |  |  |  | $ 1,150,000 |
Line of Credit | PSNH | Subsequent Event |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Amount of long-term debt requested for issuance | $ 300,000 |  |  |  |  |  |
Line of Credit | Yankee Gas Services Company |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Amount of long-term debt requested for issuance |  |  |  | $ 350,000 |  |  |
Line of Credit | NSTAR Electric |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Amount of long-term debt requested for issuance |  |  | $ 2,400,000 |  |  |  |
Pre-1983 Spent Nuclear Fuel Obligation (CYAPC) |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt |  | $ 12,500 |  |  | $ 11,900 |  |

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