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PREFERRED STOCK NOT SUBJECT TO MANDATORY REDEMPTION - Schedule of Preferred Stock by Class (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Class of Stock [Line Items] |  |
Preferred stock value outstanding | $ 155.6 | $ 155.6
CL&P |  |
Class of Stock [Line Items] |  |
Shares outstanding (in shares) | 2,324,000 | 2,324,000
Preferred stock value outstanding | $ 116.2 | $ 116.2
CL&P | Series of 1947 Preferred Stock at $1.90 |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend rate, per-dollar-amount (in dollars per share) | $ 1,900,000 | $ 1,900,000
Redemption Price Per Share (in dollars per share) | $ 52.50 |
Shares outstanding (in shares) | 163,912 | 163,912
Preferred stock value outstanding | $ 8.2 | $ 8.2
CL&P | Series of 1947 Preferred Stock at $2.00 |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend rate, per-dollar-amount (in dollars per share) | $ 2,000,000.00 | $ 2,000,000.00
Redemption Price Per Share (in dollars per share) | $ 54.00 |
Shares outstanding (in shares) | 336,088 | 336,088
Preferred stock value outstanding | $ 16.8 | $ 16.8
CL&P | Series of 1949 Preferred Stock at $2.04 |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend rate, per-dollar-amount (in dollars per share) | $ 2,040,000.00 | $ 2,040,000.00
Redemption Price Per Share (in dollars per share) | $ 52.00 |
Shares outstanding (in shares) | 100,000 | 100,000
Preferred stock value outstanding | $ 5.0 | $ 5.0
CL&P | Series of 1949 Preferred Stock at $2.20 |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend rate, per-dollar-amount (in dollars per share) | $ 2,200,000 | $ 2,200,000
Redemption Price Per Share (in dollars per share) | $ 52.50 |
Shares outstanding (in shares) | 200,000 | 200,000
Preferred stock value outstanding | $ 10.0 | $ 10.0
CL&P | Series of 1949 Preferred Stock at 3.90% |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend rate (as a percentage) | 3.90% | 3.90%
Redemption Price Per Share (in dollars per share) | $ 50.50 |
Shares outstanding (in shares) | 160,000 | 160,000
Preferred stock value outstanding | $ 8.0 | $ 8.0
CL&P | Series E of 1954 Preferred Stock at $2.06 |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend rate, per-dollar-amount (in dollars per share) | $ 2,060,000.00 | $ 2,060,000.00
Redemption Price Per Share (in dollars per share) | $ 51.00 |
Shares outstanding (in shares) | 200,000 | 200,000
Preferred stock value outstanding | $ 10.0 | $ 10.0
CL&P | Series F of 1955 Preferred Stock at $2.09 |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend rate, per-dollar-amount (in dollars per share) | $ 2,090,000.00 | $ 2,090,000.00
Redemption Price Per Share (in dollars per share) | $ 51.00 |
Shares outstanding (in shares) | 100,000 | 100,000
Preferred stock value outstanding | $ 5.0 | $ 5.0
CL&P | Series of 1956 Preferred Stock at 4.5% |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend rate (as a percentage) | 4.50% | 4.50%
Redemption Price Per Share (in dollars per share) | $ 50.75 |
Shares outstanding (in shares) | 104,000 | 104,000
Preferred stock value outstanding | $ 5.2 | $ 5.2
CL&P | Series of 1958 Preferred Stock at 4.96% |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend rate (as a percentage) | 4.96% | 4.96%
Redemption Price Per Share (in dollars per share) | $ 50.50 |
Shares outstanding (in shares) | 100,000 | 100,000
Preferred stock value outstanding | $ 5.0 | $ 5.0
CL&P | Series of 1963 Preferred Stock at 4.5% |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend rate (as a percentage) | 4.50% | 4.50%
Redemption Price Per Share (in dollars per share) | $ 50.50 |
Shares outstanding (in shares) | 160,000 | 160,000
Preferred stock value outstanding | $ 8.0 | $ 8.0
CL&P | Series of 1967 Preferred Stock at 5.28% |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend rate (as a percentage) | 5.28% | 5.28%
Redemption Price Per Share (in dollars per share) | $ 51.43 |
Shares outstanding (in shares) | 200,000 | 200,000
Preferred stock value outstanding | $ 10.0 | $ 10.0
CL&P | Series G of 1968 Preferred Stock at $3.24 |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend rate, per-dollar-amount (in dollars per share) | $ 3,240,000 | $ 3,240,000
Redemption Price Per Share (in dollars per share) | $ 51.84 |
Shares outstanding (in shares) | 300,000 | 300,000
Preferred stock value outstanding | $ 15.0 | $ 15.0
CL&P | Series of 1968 Preferred Stock at 6.56% |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend rate (as a percentage) | 6.56% | 6.56%
Redemption Price Per Share (in dollars per share) | $ 51.44 |
Shares outstanding (in shares) | 200,000 | 200,000
Preferred stock value outstanding | $ 10.0 | $ 10.0
NSTAR Electric |  |
Class of Stock [Line Items] |  |
Shares outstanding (in shares) | 430,000 | 430,000
Preferred stock value outstanding | $ 43.0 | $ 43.0
NSTAR Electric | Preferred Stock 4.25% |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend rate (as a percentage) | 4.25% | 4.25%
Redemption Price Per Share (in dollars per share) | $ 103.625 |
Shares outstanding (in shares) | 180,000 | 180,000
Preferred stock value outstanding | $ 18.0 | $ 18.0
NSTAR Electric | Preferred Stock 4.78% |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend rate (as a percentage) | 4.78% | 4.78%
Redemption Price Per Share (in dollars per share) | $ 102.80 |
Shares outstanding (in shares) | 250,000 | 250,000
Preferred stock value outstanding | $ 25.0 | $ 25.0
Aquarion Water Company | Series of Preferred Stock at 6% |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend rate (as a percentage) | 6.00% |
Redemption Price Per Share (in dollars per share) | $ 100.00 |
Shares outstanding (in shares) | 13 | 23
Preferred stock value outstanding | $ 0.0 | $ 0.0
Fair Value Adjustment | NSTAR Electric |  |
Class of Stock [Line Items] |  |
Preferred stock value outstanding | $ 3.6 | $ 3.6

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