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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Other Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Summary of Accounting Policies [Line Items]        
Other Income, Net   $ 410,482 $ 348,069 $ 346,088
Unrealized gain associated with investment   51,900 15,500 22,900
Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion        
Summary of Accounting Policies [Line Items]        
Other Income, Net   115,400 132,900 219,800
AFUDC Equity        
Summary of Accounting Policies [Line Items]        
Other Income, Net   97,800 78,100 47,300
Equity in Earnings of Unconsolidated Affiliates        
Summary of Accounting Policies [Line Items]        
Other Income, Net   51,900 15,500 22,900
Unrealized gain associated with investment       12,200
Investment (Loss)/Income        
Summary of Accounting Policies [Line Items]        
Other Income, Net   600 (4,900) 1,900
Interest Income        
Summary of Accounting Policies [Line Items]        
Other Income, Net   138,200 94,200 50,500
Other        
Summary of Accounting Policies [Line Items]        
Other Income, Net   6,600 32,300 3,700
Equity in Earnings Of Unconsolidated Affiliate        
Summary of Accounting Policies [Line Items]        
Unrealized gain associated with investment $ 23,400      
CL&P        
Summary of Accounting Policies [Line Items]        
Other Income, Net   77,591 61,560 83,252
CL&P | Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion        
Summary of Accounting Policies [Line Items]        
Other Income, Net   28,200 34,900 64,400
CL&P | AFUDC Equity        
Summary of Accounting Policies [Line Items]        
Other Income, Net   22,400 20,000 13,600
CL&P | Investment (Loss)/Income        
Summary of Accounting Policies [Line Items]        
Other Income, Net   (1,400) (2,400) (1,300)
CL&P | Interest Income        
Summary of Accounting Policies [Line Items]        
Other Income, Net   28,300 9,000 6,500
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   191,405 164,129 142,661
NSTAR Electric | Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion        
Summary of Accounting Policies [Line Items]        
Other Income, Net   52,800 57,400 85,500
NSTAR Electric | AFUDC Equity        
Summary of Accounting Policies [Line Items]        
Other Income, Net   58,800 45,700 24,600
NSTAR Electric | Investment (Loss)/Income        
Summary of Accounting Policies [Line Items]        
Other Income, Net   1,900 (200) 1,200
NSTAR Electric | Interest Income        
Summary of Accounting Policies [Line Items]        
Other Income, Net   77,000 60,600 30,700
NSTAR Electric | Other        
Summary of Accounting Policies [Line Items]        
Other Income, Net   900 600 700
PSNH        
Summary of Accounting Policies [Line Items]        
Other Income, Net   31,123 26,597 32,666
PSNH | Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion        
Summary of Accounting Policies [Line Items]        
Other Income, Net   14,900 16,200 26,800
PSNH | AFUDC Equity        
Summary of Accounting Policies [Line Items]        
Other Income, Net   7,000 5,400 2,500
PSNH | Investment (Loss)/Income        
Summary of Accounting Policies [Line Items]        
Other Income, Net   (500) (700) 200
PSNH | Interest Income        
Summary of Accounting Policies [Line Items]        
Other Income, Net   9,600 5,300 3,100
PSNH | Other        
Summary of Accounting Policies [Line Items]        
Other Income, Net   $ 100 $ 400 $ 100