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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Components of Other Income, Net (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | $ 94,875 | $ 93,861 | $ 183,857 | $ 165,422
Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 33,300 | 54,900 | 68,100 | 109,200
AFUDC Equity |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 19,000 | 11,200 | 34,500 | 21,100
Equity in Earnings of Unconsolidated Affiliates |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 5,000 | 16,600 | 8,800 | 17,100
Investment (Loss)/Income |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | (1,400) | 1,300 | (3,100) | 1,100
Interest Income |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 21,400 | 9,500 | 44,500 | 16,100
Other |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 17,600 | 400 | 31,100 | 800
Equity in Earnings |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Unrealized gain associated with investment |  | 12,200 |  | 12,200
CL&P |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 13,362 | 19,800 | 28,299 | 39,363
CL&P | Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 8,400 | 16,200 | 17,900 | 32,100
CL&P | AFUDC Equity |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 4,600 | 2,800 | 8,700 | 5,600
CL&P | Equity in Earnings of Unconsolidated Affiliates |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 0 | 0 | 0 | 0
CL&P | Investment (Loss)/Income |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | (1,100) | (700) | (1,700) | (1,100)
CL&P | Interest Income |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 1,500 | 1,500 | 3,400 | 2,800
CL&P | Other |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 0 | 0 | 0 | 0
NSTAR Electric |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 40,909 | 34,259 | 80,782 | 63,490
NSTAR Electric | Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 14,100 | 21,400 | 28,800 | 42,400
NSTAR Electric | AFUDC Equity |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 12,000 | 6,100 | 21,500 | 11,000
NSTAR Electric | Equity in Earnings of Unconsolidated Affiliates |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 100 | 100 | 200 | 100
NSTAR Electric | Investment (Loss)/Income |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 300 | 500 | (200) | 200
NSTAR Electric | Interest Income |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 14,400 | 6,100 | 30,400 | 9,600
NSTAR Electric | Other |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 0 | 100 | 100 | 200
PSNH |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 6,301 | 7,782 | 12,019 | 15,292
PSNH | Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 3,900 | 6,700 | 8,100 | 13,300
PSNH | AFUDC Equity |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 1,100 | 600 | 1,800 | 1,000
PSNH | Equity in Earnings of Unconsolidated Affiliates |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 0 | 0 | 0 | 0
PSNH | Investment (Loss)/Income |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | (300) | 100 | (400) | 300
PSNH | Interest Income |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 1,200 | 400 | 2,100 | 700
PSNH | Other |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | $ 400 | $ 0 | $ 400 | $ 0

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