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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Components of Other Income, Net (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Summary of Accounting Policies [Line Items] |  |
Other income, net | $ 71,561 | $ 34,201
Pension, SERP and PBOP Non-Service Income Components |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 54,300 | 20,100
AFUDC Equity |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 9,900 | 9,200
Equity in Earnings of Unconsolidated Affiliates |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 400 | 3,700
Investment (Loss)/Income |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | (200) | (600)
Interest Income |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 6,700 | 1,500
Other |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 500 | 300
CL&P |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 19,564 | 4,908
CL&P | Pension, SERP and PBOP Non-Service Income Components |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 15,900 | 2,700
CL&P | AFUDC Equity |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 2,800 | 1,700
CL&P | Equity in Earnings of Unconsolidated Affiliates |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 0 | 0
CL&P | Investment (Loss)/Income |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | (400) | 400
CL&P | Interest Income |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 1,300 | 100
CL&P | Other |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 0 | 0
NSTAR Electric |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 29,231 | 16,812
NSTAR Electric | Pension, SERP and PBOP Non-Service Income Components |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 21,000 | 10,100
NSTAR Electric | AFUDC Equity |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 4,900 | 6,200
NSTAR Electric | Equity in Earnings of Unconsolidated Affiliates |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 0 | 100
NSTAR Electric | Investment (Loss)/Income |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | (300) | 200
NSTAR Electric | Interest Income |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 3,500 | 100
NSTAR Electric | Other |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 100 | 100
PSNH |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 7,509 | 4,166
PSNH | Pension, SERP and PBOP Non-Service Income Components |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 6,600 | 2,700
PSNH | AFUDC Equity |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 400 | 600
PSNH | Equity in Earnings of Unconsolidated Affiliates |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 0 | 0
PSNH | Investment (Loss)/Income |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 200 | 100
PSNH | Interest Income |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | 300 | 700
PSNH | Other |  |
Summary of Accounting Policies [Line Items] |  |
Other income, net | $ 0 | $ 100

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