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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Operating Expenses (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Accounting Policies [Abstract] |  |  |
Eversource - Cost of Natural Gas | $ 1,010.2 | $ 718.6 | $ 464.2

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- Definition Fuel power costs included in Fuel, Purchased and Net Interchange line item on the income statement + References No definition available. + Details
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