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LONG-TERM DEBT - Narrative (Details) - USD ($) $ in Thousands | Jan. 28, 2025 | Dec. 31, 2024 | Dec. 18, 2024 | Aug. 12, 2024 | Jul. 24, 2024 | May 01, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt |  | $ 25,701,627 |  |  |  |  | $ 23,588,616
Interest included in payment to settle spent nuclear fuel obligation |  | 4,300 |  |  |  |  | 9,500
NSTAR Electric |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt |  | 4,844,920 |  |  |  |  | 4,496,947
Line of Credit | NSTAR Electric |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Amount of long-term debt requested for issuance |  |  |  |  |  | $ 2,400,000 |
Line of Credit | CL&P |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Amount of long-term debt requested for issuance |  |  |  |  | $ 1,000,000 |  |
Line of Credit | EGMA |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Amount of long-term debt requested for issuance |  |  |  | $ 325,000 |  |  |
Line of Credit | NSTAR Gas |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Amount of long-term debt requested for issuance |  |  | $ 475,000 |  |  |  |
Line of Credit | Yankee Gas | Subsequent Event |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Amount of long-term debt requested for issuance | $ 360,000 |  |  |  |  |  |
Pre-1983 Spent Nuclear Fuel Obligation (CYAPC) |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt |  | $ 5,600 |  |  |  |  | $ 12,500

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