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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Components of Other Income, Net (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Summary of Accounting Policies [Line Items] |  |
Other income, net | $ 92,344 | $ 91,030
Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 32,600 | 27,800
AFUDC Equity |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 23,900 | 26,800
Equity in Earnings of Unconsolidated Affiliates |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 6,000 | 7,800
Investment (Loss)/Income |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | (2,000) | (800)
Interest Income |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 34,000 | 30,000
Other |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | (2,200) | (600)
CL&P |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 17,599 | 16,468
CL&P | Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 8,300 | 6,500
CL&P | AFUDC Equity |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 3,600 | 6,000
CL&P | Equity in Earnings of Unconsolidated Affiliates |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 0 | 0
CL&P | Investment (Loss)/Income |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 100 | (700)
CL&P | Interest Income |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 5,600 | 4,700
CL&P | Other |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 0 | 0
NSTAR Electric |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 46,292 | 47,114
NSTAR Electric | Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 14,800 | 12,300
NSTAR Electric | AFUDC Equity |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 14,100 | 16,200
NSTAR Electric | Equity in Earnings of Unconsolidated Affiliates |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 200 | 200
NSTAR Electric | Investment (Loss)/Income |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | (1,800) | 400
NSTAR Electric | Interest Income |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 19,000 | 18,000
NSTAR Electric | Other |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 0 | 0
PSNH |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 10,758 | 7,050
PSNH | Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 4,100 | 3,600
PSNH | AFUDC Equity |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 3,900 | 1,900
PSNH | Equity in Earnings of Unconsolidated Affiliates |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 0 | 0
PSNH | Investment (Loss)/Income |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 100 | (200)
PSNH | Interest Income |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 2,700 | 1,800
PSNH | Other |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | $ 0 | $ 0

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