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PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION - Schedule of Aggregate Composite Depreciation Rates (Details) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Property, Plant and Equipment [Line Items] |  |  |
Composite depreciation rate for plant in service (in percent) | 3.20% | 3.10% | 3.00%
CL&P |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Composite depreciation rate for plant in service (in percent) | 2.90% | 2.80% | 2.80%
NSTAR Electric |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Composite depreciation rate for plant in service (in percent) | 2.80% | 2.70% | 2.70%
PSNH |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Composite depreciation rate for plant in service (in percent) | 3.00% | 3.00% | 3.00%

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A + Details
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- Definition Composite depreciation rate for public utility plants in service. + References No definition available. + Details
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