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SHORT-TERM AND LONG-TERM DEBT - Narrative (Details) - USD ($) | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2024 | Jul. 24, 2024 | May 01, 2024 | Feb. 08, 2024 | Dec. 31, 2023
Line of Credit Facility [Line Items] |  |  |  |  |
Long-Term Debt | $ 25,836,078,000 |  |  |  | $ 23,588,616,000
Long-term debt, current maturities classified as noncurrent | 100,000,000 |  |  |  |
NSTAR Electric |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Long-Term Debt | 5,092,959,000 |  |  |  | 4,496,947,000
CL&P |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Long-Term Debt | 4,814,280,000 |  |  |  | 4,814,429,000
Notes payable to Eversource parent | 407,800,000 |  |  |  | 249,670,000
CL&P | Related Party |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Long-Term Debt |  |  |  |  | 207,300,000
Notes payable to Eversource parent | 407,800,000 |  |  |  | 457,000,000.0
PSNH |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Long-Term Debt | 1,731,461,000 |  |  |  | 1,431,591,000
Notes payable to Eversource parent | 132,000,000 |  |  |  | 233,000,000
PSNH | Related Party |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Notes payable to Eversource parent | 132,000,000.0 |  |  |  | 233,000,000.0
Line of Credit | NSTAR Electric |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity |  |  | $ 2,400,000,000 |  |
Line of Credit | CL&P |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity | 375,000,000 |  |  |  |
Amount outstanding under line of credit | 0 |  |  |  |
Line of Credit | CL&P | Subsequent Event |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity |  | $ 1,000,000,000 |  |  |
Line of Credit | PSNH |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity | 250,000,000 |  |  | $ 300,000,000 |
Amount outstanding under line of credit | 0 |  |  |  |
Commercial Paper | NSTAR Electric |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity | 650,000,000 |  |  |  |
Commercial Paper | CL&P |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Long-Term Debt |  |  |  |  | 207,300,000
Commercial Paper | Yankee Gas |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Long-Term Debt | 37,900,000 |  |  |  |
Line of Credit |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Amount outstanding under line of credit | 0 |  |  |  | $ 0
Line of Credit | NSTAR Electric |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity | 650,000,000 |  |  |  |
Eversource Parent | Commercial Paper |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity | 2,000,000,000.00 |  |  |  |
Eversource Parent | Line of Credit |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity | $ 2,000,000,000 |  |  |  |
Debt instrument term (in years) | 5 years |  |  |  |
NSTAR Electric | Line of Credit | NSTAR Electric |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument term (in years) | 5 years |  |  |  |

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