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REVENUES - Operating Revenues Disaggregated by Revenue Source (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers $ 11,890,600 $ 12,270,200 $ 9,815,000
Alternative Revenue Programs (6,000) 5,300 41,700
Other Revenues 26,100 13,800 6,400
Operating Revenues 11,910,705 12,289,336 9,863,085
Residential      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 6,344,300 6,142,700 5,123,600
Commercial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 3,595,900 3,614,200 3,041,400
Industrial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 524,000 559,200 499,700
Total Retail Tariff Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 10,464,200 10,316,100 8,664,700
Wholesale Transmission Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 467,000 436,000 453,200
Wholesale Market Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 835,600 1,335,500 661,800
Other Revenues from Contracts with Customers      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 119,500 110,600 114,000
Amortization of Revenues Subject to Refund      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 4,300 72,000 (78,700)
CL&P      
Disaggregation of Revenue [Line Items]      
Operating Revenues 4,578,804 4,817,744 3,637,412
NSTAR Electric      
Disaggregation of Revenue [Line Items]      
Operating Revenues 3,515,539 3,583,070 3,056,350
PSNH      
Disaggregation of Revenue [Line Items]      
Operating Revenues 1,447,873 1,474,799 1,177,248
Operating Segments | Electric Distribution      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 9,007,400 9,409,500 7,404,000
Alternative Revenue Programs (54,300) (15,400) 14,700
Other Revenues 20,400 11,200 4,900
Operating Revenues 8,973,500 9,405,300 7,423,600
Operating Segments | Electric Distribution | Residential      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 5,054,200 4,796,100 3,989,800
Operating Segments | Electric Distribution | Commercial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 2,893,200 2,903,300 2,486,100
Operating Segments | Electric Distribution | Industrial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 352,400 374,900 345,300
Operating Segments | Electric Distribution | Total Retail Tariff Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 8,299,800 8,074,300 6,821,200
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 625,000 1,190,900 575,800
Operating Segments | Electric Distribution | Other Revenues from Contracts with Customers      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 82,600 72,300 78,100
Operating Segments | Electric Distribution | Amortization of Revenues Subject to Refund      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 0 72,000 (71,100)
Operating Segments | Natural Gas Distribution      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 2,182,200 2,199,500 1,752,300
Alternative Revenue Programs 35,500 14,800 37,000
Other Revenues 4,000 1,300 300
Operating Revenues 2,221,700 2,215,600 1,789,600
Operating Segments | Natural Gas Distribution | Residential      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 1,145,400 1,204,900 1,000,300
Operating Segments | Natural Gas Distribution | Commercial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 637,700 648,500 497,600
Operating Segments | Natural Gas Distribution | Industrial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 186,800 199,700 167,200
Operating Segments | Natural Gas Distribution | Total Retail Tariff Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 1,969,900 2,053,100 1,665,100
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 206,700 140,800 82,100
Operating Segments | Natural Gas Distribution | Other Revenues from Contracts with Customers      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 5,600 5,600 5,100
Operating Segments | Natural Gas Distribution | Amortization of Revenues Subject to Refund      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 0 0 0
Operating Segments | Electric Transmission      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 1,796,400 1,715,300 1,759,900
Alternative Revenue Programs 118,900 92,700 (126,100)
Other Revenues 600 700 800
Operating Revenues 1,915,900 1,808,700 1,634,600
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 1,777,500 1,700,500 1,751,300
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 14,600 14,100 13,600
Operating Segments | Electric Transmission | Amortization of Revenues Subject to Refund      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 4,300 700 (5,000)
Operating Segments | Water Distribution      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 231,000 224,400 209,400
Alternative Revenue Programs 400 (2,500) 1,500
Other Revenues 1,100 600 400
Operating Revenues 232,500 222,500 211,300
Operating Segments | Water Distribution | Residential      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 144,700 141,700 133,500
Operating Segments | Water Distribution | Commercial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 69,800 66,500 62,800
Operating Segments | Water Distribution | Industrial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 4,500 4,700 4,300
Operating Segments | Water Distribution | Total Retail Tariff Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 219,000 212,900 200,600
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 3,900 3,800 3,900
Operating Segments | Water Distribution | Other Revenues from Contracts with Customers      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 8,100 8,400 7,500
Operating Segments | Water Distribution | Amortization of Revenues Subject to Refund      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 0 (700) (2,600)
Operating Segments | CL&P      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 5,077,600 5,343,200 4,238,900
Alternative Revenue Programs 66,800 56,500 (78,900)
Other Revenues 9,600 1,800 400
Operating Segments | CL&P | Residential      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 2,597,800 2,397,200 1,994,200
Operating Segments | CL&P | Commercial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 1,082,100 1,067,900 890,600
Operating Segments | CL&P | Industrial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 137,200 146,400 131,400
Operating Segments | CL&P | Total Retail Tariff Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 3,817,100 3,611,500 3,016,200
Operating Segments | CL&P | Wholesale Transmission Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 794,700 755,100 863,300
Operating Segments | CL&P | Wholesale Market Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 429,100 873,700 408,800
Operating Segments | CL&P | Other Revenues from Contracts with Customers      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 32,400 30,200 26,700
Operating Segments | CL&P | Amortization of Revenues Subject to Refund      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 4,300 72,700 (76,100)
Operating Segments | NSTAR Electric      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 4,129,400 4,127,300 3,541,600
Alternative Revenue Programs (52,000) 700 (15,100)
Other Revenues 8,400 7,200 3,400
Operating Segments | NSTAR Electric | Residential      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 1,691,000 1,601,800 1,375,800
Operating Segments | NSTAR Electric | Commercial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 1,442,300 1,457,400 1,265,000
Operating Segments | NSTAR Electric | Industrial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 123,200 135,800 119,100
Operating Segments | NSTAR Electric | Total Retail Tariff Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 3,256,500 3,195,000 2,759,900
Operating Segments | NSTAR Electric | Wholesale Transmission Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 692,000 670,400 616,300
Operating Segments | NSTAR Electric | Wholesale Market Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 131,800 215,000 109,200
Operating Segments | NSTAR Electric | Other Revenues from Contracts with Customers      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 49,100 46,900 56,200
Operating Segments | NSTAR Electric | Amortization of 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 1,600,000 1,659,600 1,387,600
Alternative Revenue Programs 49,800 20,100 (17,400)
Other Revenues 3,000 2,900 1,900
Operating Segments | PSNH | Residential      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 765,400 797,100 619,800
Operating Segments | PSNH | Commercial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 369,600 380,800 332,200
Operating Segments | PSNH | Industrial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 92,000 92,700 94,800
Operating Segments | PSNH | Total Retail Tariff Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 1,227,000 1,270,600 1,046,800
Operating Segments | PSNH | Wholesale Transmission Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 290,800 275,000 271,700
Operating Segments | PSNH | Wholesale Market Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 64,100 102,200 57,800
Operating Segments | PSNH | Other Revenues from Contracts with Customers      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 18,100 11,800 11,300
Operating Segments | PSNH | Amortization of Revenues Subject to Refund      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 0 0 0
Other      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 1,636,600 1,435,500 1,354,000
Alternative Revenue Programs 0 0 0
Other Revenues 0 0 0
Operating Revenues 1,636,600 1,435,500 1,354,000
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 0 86,600
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 1,636,600 1,435,500 1,267,400
Other | Amortization of Revenues Subject to Refund      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 0 0 0
Eliminations      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers (2,963,000) (2,714,000) (2,664,600)
Alternative Revenue Programs (106,500) (84,300) 114,600
Other Revenues 0 0 0
Operating Revenues (3,069,500) (2,798,300) (2,550,000)
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 (4,800) (4,100) (5,100)
Eliminations | Industrial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers (19,700) (20,100) (17,100)
Eliminations | Total Retail Tariff Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers (24,500) (24,200) (22,200)
Eliminations | Wholesale Transmission Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers (1,310,500) (1,264,500) (1,384,700)
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 (1,628,000) (1,425,300) (1,257,700)
Eliminations | Amortization of Revenues Subject to Refund      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 0 0 0
Consolidations Eliminations | CL&P      
Disaggregation of Revenue [Line Items]      
Operating Revenues (575,200) (583,800) (523,000)
Consolidations Eliminations | NSTAR Electric      
Disaggregation of Revenue [Line Items]      
Operating Revenues (570,300) (552,100) (473,500)
Consolidations Eliminations | PSNH      
Disaggregation of Revenue [Line Items]      
Operating Revenues $ (204,900) $ (207,800) $ (194,900)