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PREFERRED STOCK NOT SUBJECT TO MANDATORY REDEMPTION - Narrative (Details) | Dec. 31, 2022 $ / shares shares
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CL&P |
Class of Stock [Line Items] |
Preferred stock, shares authorized (in shares) | shares | 9,000,000
Preferred stock, par value (in dollars per share) | $ / shares | $ 50
NSTAR Electric |
Class of Stock [Line Items] |
Preferred stock, shares authorized (in shares) | shares | 2,890,000
Preferred stock, par value (in dollars per share) | $ / shares | $ 100

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