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REVENUES - Operating Revenues Disaggregated by Revenue Source (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers $ 12,270,200 $ 9,815,000 $ 8,766,500
Alternative Revenue Programs 5,300 41,700 130,000
Other Revenues 13,800 6,400 7,900
Operating Revenues 12,289,336 9,863,085 8,904,430
Residential      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 6,142,700 5,123,600 4,741,500
Commercial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 3,614,200 3,041,400 2,772,900
Industrial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 559,200 499,700 425,600
Total Retail Tariff Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 10,316,100 8,664,700 7,940,000
Wholesale Transmission Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 436,000 453,200 340,900
Wholesale Market Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 1,335,500 661,800 374,100
Other Revenues from Contracts with Customers      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 110,600 114,000 111,500
Amortization of/(Reserve for) Revenues Subject to Refund      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 72,000 (78,700)  
CL&P      
Disaggregation of Revenue [Line Items]      
Operating Revenues 4,817,744 3,637,412 3,547,527
NSTAR Electric      
Disaggregation of Revenue [Line Items]      
Operating Revenues 3,583,070 3,056,350 2,941,148
PSNH      
Disaggregation of Revenue [Line Items]      
Operating Revenues 1,474,799 1,177,248 1,079,095
Operating Segments | Electric Distribution      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 9,409,500 7,404,000 7,038,600
Alternative Revenue Programs (15,400) 14,700 88,100
Other Revenues 11,200 4,900 5,600
Operating Revenues 9,405,300 7,423,600 7,132,300
Operating Segments | Electric Distribution | Residential      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 4,796,100 3,989,800 3,951,500
Operating Segments | Electric Distribution | Commercial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 2,903,300 2,486,100 2,353,400
Operating Segments | Electric Distribution | Industrial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 374,900 345,300 327,100
Operating Segments | Electric Distribution | Total Retail Tariff Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 8,074,300 6,821,200 6,632,000
Operating Segments | Electric Distribution | Wholesale Transmission Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 0 0 0
Operating Segments | Electric Distribution | Wholesale Market Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 1,190,900 575,800 327,300
Operating Segments | Electric Distribution | Other Revenues from Contracts with Customers      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 72,300 78,100 79,300
Operating Segments | Electric Distribution | Amortization of/(Reserve for) Revenues Subject to Refund      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 72,000 (71,100)  
Operating Segments | Natural Gas Distribution      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 2,199,500 1,752,300 1,162,900
Alternative Revenue Programs 14,800 37,000 44,700
Other Revenues 1,300 300 1,100
Operating Revenues 2,215,600 1,789,600 1,208,700
Operating Segments | Natural Gas Distribution | Residential      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 1,204,900 1,000,300 644,900
Operating Segments | Natural Gas Distribution | Commercial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 648,500 497,600 361,900
Operating Segments | Natural Gas Distribution | Industrial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 199,700 167,200 107,400
Operating Segments | Natural Gas Distribution | Total Retail Tariff Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 2,053,100 1,665,100 1,114,200
Operating Segments | Natural Gas Distribution | Wholesale Transmission Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 0 0 0
Operating Segments | Natural Gas Distribution | Wholesale Market Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 140,800 82,100 43,000
Operating Segments | Natural Gas Distribution | Other Revenues from Contracts with Customers      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 5,600 5,100 5,700
Operating Segments | Natural Gas Distribution | Amortization of/(Reserve for) Revenues Subject to Refund      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 0 0  
Operating Segments | Electric Transmission      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 1,715,300 1,759,900 1,570,600
Alternative Revenue Programs 92,700 (126,100) (35,200)
Other Revenues 700 800 700
Operating Revenues 1,808,700 1,634,600 1,536,100
Operating Segments | Electric Transmission | Residential      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 0 0 0
Operating Segments | Electric Transmission | Commercial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 0 0 0
Operating Segments | Electric Transmission | Industrial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 0 0 0
Operating Segments | Electric Transmission | Total Retail Tariff Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 0 0 0
Operating Segments | Electric Transmission | Wholesale Transmission Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 1,700,500 1,751,300 1,557,300
Operating Segments | Electric Transmission | Wholesale Market Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 0 0 0
Operating Segments | Electric Transmission | Other Revenues from Contracts with Customers      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 14,100 13,600 13,300
Operating Segments | Electric Transmission | Amortization of/(Reserve for) Revenues Subject to Refund      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 700 (5,000)  
Operating Segments | Water Distribution      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 224,400 209,400 219,600
Alternative Revenue Programs (2,500) 1,500 (4,700)
Other Revenues 600 400 500
Operating Revenues 222,500 211,300 215,400
Operating Segments | Water Distribution | Residential      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 141,700 133,500 145,100
Operating Segments | Water Distribution | Commercial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 66,500 62,800 62,400
Operating Segments | Water Distribution | Industrial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 4,700 4,300 4,800
Operating Segments | Water Distribution | Total Retail Tariff Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 212,900 200,600 212,300
Operating Segments | Water Distribution | Wholesale Transmission Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 0 0 0
Operating Segments | Water Distribution | Wholesale Market Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 3,800 3,900 3,800
Operating Segments | Water Distribution | Other Revenues from Contracts with Customers      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 8,400 7,500 3,500
Operating Segments | Water Distribution | Amortization of/(Reserve for) Revenues Subject to Refund      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers (700) (2,600)  
Operating Segments | CL&P      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 5,343,200 4,238,900 4,044,700
Alternative Revenue Programs 56,500 (78,900) (4,200)
Other Revenues 1,800 400 2,200
Operating Segments | CL&P | Residential      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 2,397,200 1,994,200 2,011,100
Operating Segments | CL&P | Commercial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 1,067,900 890,600 878,300
Operating Segments | CL&P | Industrial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 146,400 131,400 137,500
Operating Segments | CL&P | Total Retail Tariff Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 3,611,500 3,016,200 3,026,900
Operating Segments | CL&P | Wholesale Transmission Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 755,100 863,300 754,800
Operating Segments | CL&P | Wholesale Market Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 873,700 408,800 230,100
Operating Segments | CL&P | Other Revenues from Contracts with Customers      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 30,200 26,700 32,900
Operating Segments | CL&P | Amortization of/(Reserve for) Revenues Subject to Refund      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 72,700 (76,100) 0
Operating Segments | NSTAR Electric      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 4,127,300 3,541,600 3,327,500
Alternative Revenue Programs 700 (15,100) 54,500
Other Revenues 7,200 3,400 3,500
Operating Segments | NSTAR Electric | Residential      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 1,601,800 1,375,800 1,365,800
Operating Segments | NSTAR Electric | Commercial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 1,457,400 1,265,000 1,176,800
Operating Segments | NSTAR Electric | Industrial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 135,800 119,100 106,400
Operating Segments | NSTAR Electric | Total Retail Tariff Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 3,195,000 2,759,900 2,649,000
Operating Segments | NSTAR Electric | Wholesale Transmission Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 670,400 616,300 576,500
Operating Segments | NSTAR Electric | Wholesale Market Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 215,000 109,200 58,400
Operating Segments | NSTAR Electric | Other Revenues from Contracts with Customers      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 46,900 56,200 43,600
Operating Segments | NSTAR Electric | Amortization of/(Reserve for) Revenues Subject to Refund      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 0 0 0
Operating Segments | PSNH      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 1,659,600 1,387,600 1,241,300
Alternative Revenue Programs 20,100 (17,400) 2,600
Other Revenues 2,900 1,900 600
Operating Segments | PSNH | Residential      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 797,100 619,800 574,600
Operating Segments | PSNH | Commercial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 380,800 332,200 299,900
Operating Segments | PSNH | Industrial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 92,700 94,800 83,200
Operating Segments | PSNH | Total Retail Tariff Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 1,270,600 1,046,800 957,700
Operating Segments | PSNH | Wholesale Transmission Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 275,000 271,700 226,000
Operating Segments | PSNH | Wholesale Market Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 102,200 57,800 38,800
Operating Segments | PSNH | Other Revenues from Contracts with Customers      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 11,800 11,300 14,200
Operating Segments | PSNH | Amortization of/(Reserve for) Revenues Subject to Refund      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 0 0 4,600
Other      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 1,435,500 1,354,000 1,235,900
Alternative Revenue Programs 0 0 0
Other Revenues 0 0 0
Operating Revenues 1,435,500 1,354,000 1,235,900
Other | Residential      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 0 0 0
Other | Commercial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 0 0 0
Other | Industrial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 0 0 0
Other | Total Retail Tariff Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 0 0 0
Other | Wholesale Transmission Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 0 86,600 74,200
Other | Wholesale Market Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 0 0 0
Other | Other Revenues from Contracts with Customers      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 1,435,500 1,267,400 1,161,700
Other | Amortization of/(Reserve for) Revenues Subject to Refund      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 0 0  
Eliminations      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers (2,714,000) (2,664,600) (2,461,100)
Alternative Revenue Programs (84,300) 114,600 37,100
Other Revenues 0 0 0
Operating Revenues (2,798,300) (2,550,000) (2,424,000)
Eliminations | Residential      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 0 0 0
Eliminations | Commercial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers (4,100) (5,100) (4,800)
Eliminations | Industrial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers (20,100) (17,100) (13,700)
Eliminations | Total Retail Tariff Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers (24,200) (22,200) (18,500)
Eliminations | Wholesale Transmission Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers (1,264,500) (1,384,700) (1,290,600)
Eliminations | Wholesale Market Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 0 0 0
Eliminations | Other Revenues from Contracts with Customers      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers (1,425,300) (1,257,700) (1,152,000)
Eliminations | Amortization of/(Reserve for) Revenues Subject to Refund      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 0 0  
Consolidations Eliminations | CL&P      
Disaggregation of Revenue [Line Items]      
Operating Revenues (583,800) (523,000) (495,200)
Consolidations Eliminations | NSTAR Electric      
Disaggregation of Revenue [Line Items]      
Operating Revenues (552,100) (473,500) (444,400)
Consolidations Eliminations | PSNH      
Disaggregation of Revenue [Line Items]      
Operating Revenues $ (207,800) $ (194,900) $ (165,400)