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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Other Income (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | $ 346,088 | $ 161,282 | $ 108,590
Unrealized gain associated with investment | 22,900 | 14,200 | 14,200
Renewable Energy Fund |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other-than-temporary impairment |  | 2,800 | 2,800
Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 219,800 | 84,400 | 44,400
AFUDC Equity |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 47,300 | 37,300 | 42,000
Equity in Earnings of Unconsolidated Affiliates |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 22,900 | 14,200 | 14,200
Unrealized gain associated with investment | 12,200 | 2,100 | 2,400
Investment (Loss)/Income |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 1,900 | (200) | 1,100
Interest Income |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 50,500 | 25,600 | 4,800
Other |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 1,100 | (100) | 300
Gain on Sale of Property |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 2,600 | 100 | 1,800
CL&P |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 83,252 | 30,187 | 20,774
CL&P | Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 64,400 | 15,200 | 3,800
CL&P | AFUDC Equity |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 13,600 | 7,700 | 13,800
CL&P | Investment (Loss)/Income |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | (1,300) | 1,300 | 1,100
CL&P | Interest Income |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 6,500 | 5,900 | 2,000
CL&P | Other |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 100 | 100 | 100
NSTAR Electric |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 142,661 | 74,844 | 52,017
NSTAR Electric | Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 85,500 | 40,200 | 29,300
NSTAR Electric | AFUDC Equity |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 24,600 | 20,400 | 21,500
NSTAR Electric | Investment (Loss)/Income |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 1,200 | 100 | (800)
NSTAR Electric | Interest Income |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 30,700 | 13,400 | 900
NSTAR Electric | Other |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 700 | 700 | 1,100
PSNH |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 32,666 | 14,565 | 13,786
PSNH | Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 26,800 | 10,300 | 7,000
PSNH | AFUDC Equity |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 2,500 | 1,600 | 4,200
PSNH | Investment (Loss)/Income |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 200 | 100 | 100
PSNH | Interest Income |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 3,100 | 2,400 | 2,400
PSNH | Other |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | $ 100 | $ 200 | $ 100

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