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COMMITMENTS AND CONTINGENCIES - CL&P Tropical Storm Isaias Response Investigation (Details) - USD ($) $ / shares in Units, $ in Millions | Sep. 30, 2021 | Jul. 14, 2021 | May 07, 2021 | May 06, 2021 | Apr. 28, 2021
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Loss Contingencies [Line Items] |  |  |  |  |
Loss contingency, allowed rate of ROE |  |  |  |  | 9.25%
Unfavorable Regulatory Action |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loss contingency, estimate of possible earnings impact |  |  |  | $ 30.0 |
Loss contingency, estimate of possible earnings impact, non-compliance with performance standards |  |  |  | 28.4 |
Loss contingency, estimate of possible earnings impact, accident reporting violation fines |  |  |  | $ 1.6 |
Non-compliance fine |  | $ 28.6 |  |  |
Loss contingency, accident reporting violation fines |  | $ 0.2 |  |  |
Loss contingency, penalty rate as a percent of distribution revenues |  |  | 2.50% |  |
Loss contingency, after-tax earnings impact per share (in dollars per share) | $ (0.25) | $ 0.07 |  |  |

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