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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, 2023 | Mar. 31, 2022
Summary of Accounting Policies [Line Items] |  |
Other income, net | $ 88,981 | $ 71,561
Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 34,800 | 54,300
AFUDC Equity |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 15,500 | 9,900
Equity in Earnings of Unconsolidated Affiliates |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 3,800 | 400
Investment Income/(Loss) |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | (1,700) | (200)
Interest Income |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 23,100 | 6,700
Other |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 13,500 | 500
CL&P |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 14,937 | 19,564
CL&P | Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 9,500 | 15,900
CL&P | AFUDC Equity |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 4,100 | 2,800
CL&P | Equity in Earnings of Unconsolidated Affiliates |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 0 | 0
CL&P | Investment Income/(Loss) |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | (600) | (400)
CL&P | Interest Income |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 1,900 | 1,300
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 | 39,873 | 29,231
NSTAR Electric | Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 14,700 | 21,000
NSTAR Electric | AFUDC Equity |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 9,500 | 4,900
NSTAR Electric | Equity in Earnings of Unconsolidated Affiliates |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 100 | 0
NSTAR Electric | Investment Income/(Loss) |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | (500) | (300)
NSTAR Electric | Interest Income |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 16,000 | 3,500
NSTAR Electric | Other |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 100 | 100
PSNH |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 5,717 | 7,509
PSNH | Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 4,200 | 6,600
PSNH | AFUDC Equity |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 700 | 400
PSNH | Equity in Earnings of Unconsolidated Affiliates |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 0 | 0
PSNH | Investment Income/(Loss) |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | (100) | 200
PSNH | Interest Income |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 900 | 300
PSNH | Other |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | $ 0 | $ 0

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