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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, 2024 | Jun. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Summary of Accounting Policies [Line Items] |  |  |  |  |
Other income, net | $ 112,555 |  | $ 79,123 | $ 318,870 | $ 262,980
Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |
Other income, net | 31,600 |  | 28,500 | 89,400 | 96,600
AFUDC Equity |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |
Other income, net | 22,700 |  | 21,000 | 73,200 | 55,500
Equity in Earnings of Unconsolidated Affiliates |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |
Other income, net | 17,100 |  | 2,700 | 48,100 | 11,500
Investment (Loss)/Income |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |
Other income, net | (2,100) |  | 2,700 | (1,800) | (400)
Interest Income |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |
Other income, net | 38,900 |  | 24,100 | 106,000 | 68,600
Other |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |
Other income, net | 4,400 |  | 100 | 4,000 | 31,200
Equity in Earnings |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |
Unrealized gain associated with investment |  | $ 23,400 |  |  |
CL&P |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |
Other income, net | 21,944 |  | 18,311 | 61,389 | 46,610
CL&P | Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |
Other income, net | 7,700 |  | 7,000 | 21,400 | 24,900
CL&P | AFUDC Equity |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |
Other income, net | 5,400 |  | 5,200 | 16,900 | 13,900
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 | (900) |  | 1,500 | (1,700) | (200)
CL&P | Interest Income |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |
Other income, net | 9,700 |  | 4,600 | 24,800 | 8,000
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 | 47,489 |  | 39,908 | 143,024 | 120,690
NSTAR Electric | Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |
Other income, net | 13,900 |  | 12,900 | 39,500 | 41,700
NSTAR Electric | AFUDC Equity |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |
Other income, net | 13,000 |  | 12,500 | 44,400 | 34,000
NSTAR Electric | Equity in Earnings of Unconsolidated Affiliates |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |
Other income, net | 200 |  | 100 | 600 | 300
NSTAR Electric | Investment (Loss)/Income |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |
Other income, net | (200) |  | 700 | 700 | 500
NSTAR Electric | Interest Income |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |
Other income, net | 20,600 |  | 13,600 | 57,800 | 44,000
NSTAR Electric | Other |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |
Other income, net | 0 |  | 100 | 0 | 200
PSNH |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |
Other income, net | 8,097 |  | 7,180 | 22,919 | 19,199
PSNH | Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |
Other income, net | 3,900 |  | 3,700 | 11,200 | 11,800
PSNH | AFUDC Equity |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |
Other income, net | 1,500 |  | 1,600 | 5,100 | 3,400
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) |  | 400 | (500) | 0
PSNH | Interest Income |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |
Other income, net | 3,000 |  | 1,500 | 7,100 | 3,600
PSNH | Other |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |
Other income, net | $ 0 |  | $ 0 | $ 0 | $ 400

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