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SHORT-TERM DEBT - Narrative (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 03, 2021 | Dec. 18, 2019
Commercial Paper | Eversource |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Amount of commercial paper program | $ 2,000,000,000 |  |  |
Line of Credit |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Amount outstanding during period | 0 | $ 0 |  |
Line of Credit | Eversource |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Amount of commercial paper program | $ 2,000,000,000 |  |  |
Debt instrument term | 5 years |  |  |
The Connecticut Light and Power Company |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Short-term borrowing limit approved by regulatory agency |  |  | $ 600,000,000 |
The Connecticut Light and Power Company | 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 | $ 963,600,000 |  |  |
The Connecticut Light and Power Company | Line of Credit |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Amount of commercial paper program | 450,000,000 |  |  |
Borrowings outstanding | 0 |  |  |
NSTAR Electric Company |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Short-term borrowing limit approved by regulatory agency |  |  |  | $ 655,000,000
Notes payable to related parties | 0 | 21,300,000 |  |
NSTAR Electric Company | Commercial Paper |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Amount of commercial paper program | 650,000,000 |  |  |
NSTAR Electric Company | Line of Credit |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Amount of commercial paper program | $ 650,000,000 |  |  |
Debt instrument term | 5 years |  |  |
Public Service Company of New Hampshire |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Short-term borrowing limit approved by regulatory agency | $ 408,000,000 |  |  |
Notes payable to related parties | $ 110,600,000 | $ 46,300,000 |  |
Public Service Company of New Hampshire | 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 |  |  |
Public Service Company of New Hampshire | Line of Credit |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Amount of commercial paper program | $ 300,000,000 |  |  |

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