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COMMITMENTS AND CONTINGENCIES - CL&P Tropical Storm Isaias Response Investigation (Details) $ in Millions | Jul. 14, 2021 USD ($) | May 07, 2021 | Apr. 28, 2021
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Loss Contingencies [Line Items] |  |  |
Loss contingency, allowed rate of ROE, downward adjustment |  |  | 0.0090
Loss contingency, allowed rate of ROE (in percent) |  |  | 9.25%
Unfavorable Regulatory Action |  |  |
Loss Contingencies [Line Items] |  |  |
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% |

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