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COMMITMENTS AND CONTINGENCIES - CL&P Regulatory Matters (Details) $ / shares in Units, $ in Thousands |  | 9 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 01, 2021 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) $ / shares | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Sep. 01, 2021 USD ($) | Jul. 14, 2021 USD ($) $ / shares | May 07, 2021 | May 06, 2021 USD ($) | Apr. 28, 2021 | Dec. 31, 2020 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss contingency, allowed rate of ROE (in percent) |  |  |  |  |  |  |  |  |  | 9.25% |
Loss contingency, allowed rate of ROE, downward adjustment (in basis points) |  |  |  |  |  |  |  |  |  | 0.0090 |
Cash, cash equivalents, restricted cash and restricted cash equivalents |  | $ 602,256 | $ 218,129 |  | $ 221,008 |  |  |  |  |  | $ 264,950
Regulatory Liabilities |  | 988,714 |  |  | 602,432 |  |  |  |  |  |
Loss related to litigation settlement |  | (72,041) | 103,583 |  |  |  |  |  |  |  |
Basis points reduction to return on equity, scenario 1 | 0.90% |  |  |  |  |  |  |  |  |  |
Basis points reduction to return on equity, scenario 2 | 0.45% |  |  |  |  |  |  |  |  |  |
CL&P |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash, cash equivalents, restricted cash and restricted cash equivalents |  | 23,120 | 71,762 |  | 74,788 |  |  |  |  |  | $ 99,809
Regulatory Liabilities |  | 434,465 |  |  | 266,489 |  |  |  |  |  |
Loss related to litigation settlement |  | (72,041) | $ 103,583 |  |  |  |  |  |  |  |
Customer Assistance Fund | CL&P |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash, cash equivalents, restricted cash and restricted cash equivalents |  |  |  | $ 10,000 | $ 10,000 |  |  |  |  |  |
Unfavorable Regulatory Action |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss contingency, estimate of possible earnings impact |  |  |  |  |  |  |  |  | $ 30,000 |  |
Loss contingency, estimate of possible earnings impact, non-compliance with performance standards |  |  |  |  |  |  |  |  | 28,400 |  |
Loss contingency, estimate of possible earnings impact, accident reporting violation fines |  |  |  |  |  |  |  |  | $ 1,600 |  |
Non-compliance fine |  |  |  |  |  |  | $ 28,600 |  |  |  |
Loss contingency, accident reporting violation fines |  |  |  |  |  |  | $ 200 |  |  |  |
Loss contingency, penalty rate as a percent of distribution revenues |  |  |  |  |  |  |  | 2.50% |  |  |
Loss contingency, after-tax earnings impact per share (in dollars per share) | $ / shares |  |  | $ 0.25 |  |  |  | $ 0.07 |  |  |  |
Loss related to litigation settlement |  |  | $ 103,600 |  |  |  |  |  |  |  |
Loss Contingency, Settlement Agreement, Customer Credits And Assistance | $ 75,000 |  |  |  |  |  |  |  |  |  |
Gain ​(Loss) Related To Litigation Settlement, Net Of Tax |  |  | (85,800) |  |  |  |  |  |  |  |
Unfavorable Regulatory Action | Sales |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss related to litigation settlement |  |  | 65,000 |  |  |  |  |  |  |  |
Unfavorable Regulatory Action | Oil and Gas, Operation and Maintenance |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss related to litigation settlement |  |  | 10,000 |  |  |  |  |  |  |  |
Unfavorable Regulatory Action | CL&P |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss contingency, estimate of possible earnings impact, non-compliance with performance standards |  |  |  |  |  | $ 28,400 |  |  |  |  |
Loss contingency, settlement agreement, customer credits | 65,000 |  |  |  |  |  |  |  |  |  |
Loss contingency, settlement agreement, customer assistance initiatives | $ 10,000 |  |  |  |  |  |  |  |  |  |
Regulatory Liabilities |  |  | $ 75,000 |  |  |  |  |  |  |  |
Unfavorable Regulatory Action | CL&P | Sales |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss related to litigation settlement |  | $ 65,000 |  |  |  |  |  |  |  |  |

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