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INCOME TAXES - Tax Credits and Loss Carryforwards (Details) - State and Local Jurisdiction - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Operating Loss Carryforwards [Line Items] |  |
State Net Operating Loss | $ 243.4 | $ 288.1
State Tax Credit | 228.5 | 204.5
State Charitable Contribution | 7.9 | 20.1
CL&P |  |
Operating Loss Carryforwards [Line Items] |  |
State Net Operating Loss | 0.0 | 0.0
State Tax Credit | 157.5 | 137.7
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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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-3 + Details
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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-3 + Details
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