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COMMON SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |
Dividends on preferred stock | $ 1,880 | $ 1,880 | $ 1,880 | $ 1,880 | $ 1,880 | $ 1,880 |  |  |
Noncontrolling interest attributed to preferred stock of subsidiaries | 155,570 |  |  |  |  |  | $ 155,570 |  | $ 155,570
CL&P and NSTAR |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |
Dividends on preferred stock | $ 1,900 |  |  | $ 1,900 |  |  | $ 5,600 | $ 5,600 |

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