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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Other Income (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | $ 348,069 | $ 346,088 | $ 161,282
Unrealized gain associated with investment | 15,500 | 22,900 | 14,200
Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 132,900 | 219,800 | 84,400
AFUDC Equity |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 78,100 | 47,300 | 37,300
Equity in Earnings of Unconsolidated Affiliates |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 15,500 | 22,900 | 14,200
Unrealized gain associated with investment |  | 12,200 | 2,100
Investment (Loss)/Income |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | (4,900) | 1,900 | (200)
Interest Income |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 94,200 | 50,500 | 25,600
Other |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 32,300 | 3,700 | 0
CL&P |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 61,560 | 83,252 | 30,187
CL&P | Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 34,900 | 64,400 | 15,200
CL&P | AFUDC Equity |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 20,000 | 13,600 | 7,700
CL&P | Investment (Loss)/Income |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | (2,400) | (1,300) | 1,300
CL&P | Interest Income |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 9,000 | 6,500 | 5,900
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 | 164,129 | 142,661 | 74,844
NSTAR Electric | Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 57,400 | 85,500 | 40,200
NSTAR Electric | AFUDC Equity |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 45,700 | 24,600 | 20,400
NSTAR Electric | Investment (Loss)/Income |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | (200) | 1,200 | 100
NSTAR Electric | Interest Income |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 60,600 | 30,700 | 13,400
NSTAR Electric | Other |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 600 | 700 | 700
PSNH |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 26,597 | 32,666 | 14,565
PSNH | Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 16,200 | 26,800 | 10,300
PSNH | AFUDC Equity |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 5,400 | 2,500 | 1,600
PSNH | Investment (Loss)/Income |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | (700) | 200 | 100
PSNH | Interest Income |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | 5,300 | 3,100 | 2,400
PSNH | Other |  |  |
Summary of Accounting Policies [Line Items] |  |  |
Other Income, Net | $ 400 | $ 100 | $ 200

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