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SHORT-TERM DEBT - Narrative (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 18, 2023 | Nov. 30, 2023
Short-term Debt [Line Items] |  |  |  |
Long-term debt | $ 25,701,627,000 | $ 23,588,616,000 |  |
Eversource |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Long-term debt | 10,729,256,000 | 9,952,351,000 |  |
Commercial Paper |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Long-term debt |  | 990,900,000 |  |
Commercial Paper | Eversource |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Maximum borrowing capacity | 2,000,000,000.00 |  |  |
Line of Credit |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Amount outstanding during period | 0 | 0 |  |
Line of Credit | Eversource |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Maximum borrowing capacity | $ 2,000,000,000.00 |  |  |
Debt instrument term (in years) | 5 years |  |  |
CL&P |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Short-term borrowing limit approved by regulatory agency |  |  |  | $ 600,000,000
Long-term debt | $ 5,108,173,000 | 4,814,429,000 |  |
Notes payable | 280,000,000 | 249,670,000 |  |
CL&P | Related Party |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Long-term debt |  | 207,300,000 |  |
Notes payable | $ 280,000,000.0 | 457,000,000 |  |
CL&P | Unsecured Debt |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Period of maturity restricting provisions of debt | 10 years |  |  |
Total capitalization (as a percentage) | 10.00% |  |  |
Capacity available under preferred stock provisions | $ 901,000,000.0 |  |  |
CL&P | Commercial Paper |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Long-term debt |  | 139,800,000 |  |
CL&P | Commercial Paper |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Long-term debt |  | 207,300,000 |  |
CL&P | Line of Credit |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Maximum borrowing capacity | 375,000,000 |  |  |
Borrowings outstanding | 0 |  |  |
NSTAR Electric |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Short-term borrowing limit approved by regulatory agency |  |  | $ 655,000,000 |
Long-term debt | 4,844,920,000 | 4,496,947,000 |  |
Notes payable | 504,782,000 | 365,847,000 |  |
NSTAR Electric | Unsecured Debt |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Long-term debt | 5,000,000,000 | 4,400,000,000 |  |
NSTAR Electric | Commercial Paper |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Maximum borrowing capacity | 650,000,000 |  |  |
NSTAR Electric | Line of Credit |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Maximum borrowing capacity | $ 650,000,000 |  |  |
Debt instrument term (in years) | 5 years |  |  |
PSNH |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Short-term borrowing limit approved by regulatory agency | $ 526,700,000 |  |  |
Long-term debt | 1,732,066,000 | 1,431,591,000 |  |
Notes payable | 131,100,000 | 233,000,000 |  |
PSNH | Related Party |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Notes payable | $ 131,100,000 | $ 233,000,000.0 |  |
PSNH | Short Term Debt Authorization Calculation |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Interest rate | 10.00% |  |  |
Short-term debt borrowing calculation approved by regulatory agency | $ 60,000,000 |  |  |
PSNH | Line of Credit |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Maximum borrowing capacity | 250,000,000 |  |  |
Borrowings outstanding | $ 0 |  |  |

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