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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Components of Other Income, Net (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | $ 89,831 | $ 43,768 | $ 255,253 | $ 124,588
Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 55,300 | 21,700 | 164,500 | 63,900
AFUDC Equity |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 12,600 | 10,300 | 33,700 | 28,700
Equity in Earnings of Unconsolidated Affiliates |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 3,800 | 4,900 | 20,800 | 13,300
Investment Income/(Loss) |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 1,300 | (600) | 2,400 | 700
Interest Income |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 14,100 | 7,300 | 30,300 | 17,200
Gain on Sale of Property |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 2,500 | 0 | 2,700 | 100
Other |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 200 | 200 | 900 | 700
Equity In Earnings |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Unrealized gain associated with investment |  |  | 12,200 | 2,100
CL&P |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 21,927 | 6,903 | 61,290 | 21,690
CL&P | Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 16,200 | 4,200 | 48,300 | 11,200
CL&P | AFUDC Equity |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 3,700 | 1,700 | 9,300 | 5,100
CL&P | Equity in Earnings of Unconsolidated Affiliates |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 0 | 0 | 0 | 0
CL&P | Investment Income/(Loss) |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 200 | (300) | (900) | 1,200
CL&P | Interest Income |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 1,800 | 1,300 | 4,600 | 4,100
CL&P | Gain on Sale of Property |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 0 | 0 | 0 | 0
CL&P | Other |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 0 | 0 | 0 | 100
NSTAR Electric |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 37,895 | 20,215 | 101,385 | 58,941
NSTAR Electric | Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 21,600 | 10,100 | 64,000 | 30,300
NSTAR Electric | AFUDC Equity |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 6,500 | 6,200 | 17,500 | 18,600
NSTAR Electric | Equity in Earnings of Unconsolidated Affiliates |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 100 | 100 | 200 | 300
NSTAR Electric | Investment Income/(Loss) |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 400 | (200) | 600 | 600
NSTAR Electric | Interest Income |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 9,200 | 3,900 | 18,800 | 8,800
NSTAR Electric | Gain on Sale of Property |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 0 | 0 | 0 | 0
NSTAR Electric | Other |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 100 | 100 | 300 | 300
PSNH |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 8,073 | 3,171 | 23,365 | 11,598
PSNH | Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 6,800 | 2,500 | 20,100 | 7,900
PSNH | AFUDC Equity |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 700 | 300 | 1,700 | 1,200
PSNH | Equity in Earnings of Unconsolidated Affiliates |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 0 | 0 | 0 | 0
PSNH | Investment Income/(Loss) |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 200 | (100) | 500 | 300
PSNH | Interest Income |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 400 | 400 | 1,100 | 2,000
PSNH | Gain on Sale of Property |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 0 | 0 | 0 | 100
PSNH | Other |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | $ 0 | $ 100 | $ 0 | $ 100

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