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INCOME TAXES - Tax Credits and Loss Carryforwards (Details) - State and Local Jurisdiction - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Operating Loss Carryforwards [Line Items] |  |
State Net Operating Loss | $ 288.1 | $ 138.3
State Tax Credit | 204.5 | 197.7
State Charitable Contribution | 20.1 | 23.7
CL&P |  |
Operating Loss Carryforwards [Line Items] |  |
State Net Operating Loss | 0.0 | 0.0
State Tax Credit | 137.7 | 137.0
State Charitable Contribution | 0.0 | 0.0
NSTAR Electric |  |
Operating Loss Carryforwards [Line Items] |  |
State Net Operating Loss | 0.0 | 0.0
State Tax Credit | 0.0 | 0.0
State Charitable Contribution | 0.0 | 0.0
PSNH |  |
Operating Loss Carryforwards [Line Items] |  |
State Net Operating Loss | 0.0 | 0.0
State Tax Credit | 0.0 | 0.0
State Charitable Contribution | $ 0.0 | $ 0.0

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- Definition Amount of future tax deductions arising from contributions in excess of statutory limitations in historical filings, and which can only be realized if sufficient tax-basis income is generated in future periods to enable deductions to be taken and providing tax laws continue to allow such deductions. + References No definition available. + Details
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