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REGULATORY ACCOUNTING - Components of Regulatory Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Regulatory Assets [Line Items]    
Total Regulatory Assets $ 5,563,400 $ 5,514,700
Less: Current Portion 785,125 651,112
Total Long-Term Regulatory Assets 4,778,321 4,863,639
Benefit Costs    
Regulatory Assets [Line Items]    
Total Regulatory Assets 2,334,300 2,382,900
Income Taxes, Net    
Regulatory Assets [Line Items]    
Total Regulatory Assets 727,200 725,800
Securitized Stranded Costs    
Regulatory Assets [Line Items]    
Total Regulatory Assets 554,500 565,300
Storm Restoration Costs    
Regulatory Assets [Line Items]    
Total Regulatory Assets 497,600 540,600
Regulatory Tracker Mechanisms    
Regulatory Assets [Line Items]    
Total Regulatory Assets 551,500 411,500
Derivative Liabilities    
Regulatory Assets [Line Items]    
Total Regulatory Assets 335,200 334,500
Goodwill-related    
Regulatory Assets [Line Items]    
Total Regulatory Assets 327,300 331,500
Asset Retirement Obligations    
Regulatory Assets [Line Items]    
Total Regulatory Assets 99,300 97,200
Other Regulatory Assets    
Regulatory Assets [Line Items]    
Total Regulatory Assets 136,500 125,400
CL&P    
Regulatory Assets [Line Items]    
Total Regulatory Assets 1,819,600 1,735,900
Less: Current Portion 290,630 178,607
Total Long-Term Regulatory Assets 1,529,003 1,557,261
CL&P | Benefit Costs    
Regulatory Assets [Line Items]    
Total Regulatory Assets 528,300 539,000
CL&P | Income Taxes, Net    
Regulatory Assets [Line Items]    
Total Regulatory Assets 458,900 458,800
CL&P | Securitized Stranded Costs    
Regulatory Assets [Line Items]    
Total Regulatory Assets 0 0
CL&P | Storm Restoration Costs    
Regulatory Assets [Line Items]    
Total Regulatory Assets 251,600 274,600
CL&P | Regulatory Tracker Mechanisms    
Regulatory Assets [Line Items]    
Total Regulatory Assets 191,000 78,300
CL&P | Derivative Liabilities    
Regulatory Assets [Line Items]    
Total Regulatory Assets 333,800 329,200
CL&P | Goodwill-related    
Regulatory Assets [Line Items]    
Total Regulatory Assets 0 0
CL&P | Asset Retirement Obligations    
Regulatory Assets [Line Items]    
Total Regulatory Assets 31,200 30,800
CL&P | Other Regulatory Assets    
Regulatory Assets [Line Items]    
Total Regulatory Assets 24,800 25,200
NSTAR Electric    
Regulatory Assets [Line Items]    
Total Regulatory Assets 1,529,300 1,535,600
Less: Current Portion 304,007 285,591
Total Long-Term Regulatory Assets 1,225,314 1,250,029
NSTAR Electric | Benefit Costs    
Regulatory Assets [Line Items]    
Total Regulatory Assets 616,300 629,800
NSTAR Electric | Income Taxes, Net    
Regulatory Assets [Line Items]    
Total Regulatory Assets 108,500 108,000
NSTAR Electric | Securitized Stranded Costs    
Regulatory Assets [Line Items]    
Total Regulatory Assets 0 0
NSTAR Electric | Storm Restoration Costs    
Regulatory Assets [Line Items]    
Total Regulatory Assets 183,000 200,600
NSTAR Electric | Regulatory Tracker Mechanisms    
Regulatory Assets [Line Items]    
Total Regulatory Assets 227,400 207,100
NSTAR Electric | Derivative Liabilities    
Regulatory Assets [Line Items]    
Total Regulatory Assets 0 0
NSTAR Electric | Goodwill-related    
Regulatory Assets [Line Items]    
Total Regulatory Assets 281,000 284,600
NSTAR Electric | Asset Retirement Obligations    
Regulatory Assets [Line Items]    
Total Regulatory Assets 51,500 50,300
NSTAR Electric | Other Regulatory Assets    
Regulatory Assets [Line Items]    
Total Regulatory Assets 61,600 55,200
PSNH    
Regulatory Assets [Line Items]    
Total Regulatory Assets 946,300 945,800
Less: Current Portion 102,438 84,053
Total Long-Term Regulatory Assets 843,904 861,672
PSNH | Benefit Costs    
Regulatory Assets [Line Items]    
Total Regulatory Assets 213,900 218,200
PSNH | Income Taxes, Net    
Regulatory Assets [Line Items]    
Total Regulatory Assets 12,800 12,800
PSNH | Securitized Stranded Costs    
Regulatory Assets [Line Items]    
Total Regulatory Assets 554,500 565,300
PSNH | Storm Restoration Costs    
Regulatory Assets [Line Items]    
Total Regulatory Assets 63,000 65,400
PSNH | Regulatory Tracker Mechanisms    
Regulatory Assets [Line Items]    
Total Regulatory Assets 84,600 65,800
PSNH | Derivative Liabilities    
Regulatory Assets [Line Items]    
Total Regulatory Assets 0 0
PSNH | Goodwill-related    
Regulatory Assets [Line Items]    
Total Regulatory Assets 0 0
PSNH | Asset Retirement Obligations    
Regulatory Assets [Line Items]    
Total Regulatory Assets 3,700 3,600
PSNH | Other Regulatory Assets    
Regulatory Assets [Line Items]    
Total Regulatory Assets $ 13,800 $ 14,700