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REGULATORY ACCOUNTING - Components of Regulatory Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities $ 4,821,100 $ 4,468,700
Less:  Current Portion 890,786 602,432
Total Long-Term Regulatory Liabilities 3,930,305 3,866,251
EDIT due to Tax Cuts and Jobs Act of 2017    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 2,619,300 2,685,200
Cost of Removal    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 670,600 649,600
Regulatory Tracking Mechanisms    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 890,800 448,400
Deferred Portion of Non-Service Income Components of Pension, SERP and PBOP    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 270,900 148,300
Benefit Costs    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 55,400 133,500
AFUDC - Transmission    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 98,200 81,000
CL&P Settlement Agreement and Storm Performance Penalty    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 0 81,300
Other Regulatory Liabilities    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 215,900 241,400
CL&P    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 1,599,400 1,459,800
Less:  Current Portion 336,048 266,489
Total Long-Term Regulatory Liabilities 1,263,396 1,193,259
CL&P | EDIT due to Tax Cuts and Jobs Act of 2017    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 983,600 996,100
CL&P | Cost of Removal    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 130,800 100,100
CL&P | Regulatory Tracking Mechanisms    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 361,000 182,000
CL&P | Deferred Portion of Non-Service Income Components of Pension, SERP and PBOP    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 34,500 12,000
CL&P | Benefit Costs    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 700 0
CL&P | AFUDC - Transmission    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 48,200 43,200
CL&P | CL&P Settlement Agreement and Storm Performance Penalty    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 0 81,300
CL&P | Other Regulatory Liabilities    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 40,600 45,100
NSTAR Electric    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 1,921,300 1,787,300
Less:  Current Portion 373,221 228,248
Total Long-Term Regulatory Liabilities 1,548,081 1,559,072
NSTAR Electric | EDIT due to Tax Cuts and Jobs Act of 2017    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 944,300 984,500
NSTAR Electric | Cost of Removal    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 405,300 381,000
NSTAR Electric | Regulatory Tracking Mechanisms    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 336,100 185,100
NSTAR Electric | Deferred Portion of Non-Service Income Components of Pension, SERP and PBOP    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 139,700 90,700
NSTAR Electric | Benefit Costs    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 31,400 107,400
NSTAR Electric | AFUDC - Transmission    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 50,000 37,800
NSTAR Electric | CL&P Settlement Agreement and Storm Performance Penalty    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 0 0
NSTAR Electric | Other Regulatory Liabilities    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 14,500 800
PSNH    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 553,600 501,600
Less:  Current Portion 161,963 120,176
Total Long-Term Regulatory Liabilities 391,628 381,366
PSNH | EDIT due to Tax Cuts and Jobs Act of 2017    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 348,600 359,200
PSNH | Cost of Removal    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 14,700 17,200
PSNH | Regulatory Tracking Mechanisms    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 155,000 107,000
PSNH | Deferred Portion of Non-Service Income Components of Pension, SERP and PBOP    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 28,800 14,900
PSNH | Benefit Costs    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 0 0
PSNH | AFUDC - Transmission    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 0 0
PSNH | CL&P Settlement Agreement and Storm Performance Penalty    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 0 0
PSNH | Other Regulatory Liabilities    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities $ 6,500 $ 3,300