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COMMON SHARES - Common Shares Authorized and Issued (Details) - $ / shares | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Class of Stock [Line Items] |  |  |
Par value (in dollars per share) | $ 5 | $ 5 | $ 5
Authorized (in shares) | 410,000,000 |  | 410,000,000
Issued (in shares) | 364,190,722 |  | 359,984,073
CL&P |  |  |
Class of Stock [Line Items] |  |  |
Par value (in dollars per share) | $ 10 |  | $ 10
Authorized (in shares) | 24,500,000 |  | 24,500,000
Issued (in shares) | 6,035,205 |  | 6,035,205
NSTAR Electric |  |  |
Class of Stock [Line Items] |  |  |
Par value (in dollars per share) | $ 1 |  | $ 1
Authorized (in shares) | 100,000,000 |  | 100,000,000
Issued (in shares) | 200 |  | 200
PSNH |  |  |
Class of Stock [Line Items] |  |  |
Par value (in dollars per share) | $ 1 |  | $ 1
Authorized (in shares) | 100,000,000 |  | 100,000,000
Issued (in shares) | 301 |  | 301

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