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REVENUES - Operating Revenues Disaggregated by Revenue Source (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers $ 11,801,800 $ 11,890,600 $ 12,270,200
Alternative Revenue Programs 74,900 (6,000) 5,300
Other Revenues 24,100 26,100 13,800
Operating Revenues 11,900,809 11,910,705 12,289,336
Residential      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 6,184,300 6,344,300 6,142,700
Commercial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 3,623,900 3,595,900 3,614,200
Industrial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 543,800 524,000 559,200
Total Retail Tariff Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 10,352,000 10,464,200 10,316,100
Wholesale Transmission Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 503,100 467,000 436,000
Wholesale Market Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 825,000 835,600 1,335,500
Other Revenues from Contracts with Customers      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 123,600 119,500 110,600
Reserve for Revenues Subject to Refund      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers (1,900) 4,300 72,000
CL&P      
Disaggregation of Revenue [Line Items]      
Operating Revenues 4,614,977 4,578,804 4,817,744
NSTAR Electric      
Disaggregation of Revenue [Line Items]      
Operating Revenues 3,720,877 3,515,539 3,583,070
PSNH      
Disaggregation of Revenue [Line Items]      
Operating Revenues 1,294,493 1,447,873 1,474,799
Operating Segments | Electric Distribution      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 9,018,200 9,007,400 9,409,500
Alternative Revenue Programs 28,700 (54,300) (15,400)
Other Revenues 19,600 20,400 11,200
Operating Revenues 9,066,500 8,973,500 9,405,300
Operating Segments | Electric Distribution | Residential      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 4,904,800 5,054,200 4,796,100
Operating Segments | Electric Distribution | Commercial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 2,973,300 2,893,200 2,903,300
Operating Segments | Electric Distribution | Industrial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 389,000 352,400 374,900
Operating Segments | Electric Distribution | Total Retail Tariff Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 8,267,100 8,299,800 8,074,300
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 658,900 625,000 1,190,900
Operating Segments | Electric Distribution | Other Revenues from Contracts with Customers      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 92,200 82,600 72,300
Operating Segments | Electric Distribution | Reserve for Revenues Subject to Refund      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 0 0 72,000
Operating Segments | Natural Gas Distribution      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 2,056,600 2,182,200 2,199,500
Alternative Revenue Programs 44,500 35,500 14,800
Other Revenues 2,800 4,000 1,300
Operating Revenues 2,103,900 2,221,700 2,215,600
Operating Segments | Natural Gas Distribution | Residential      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 1,129,100 1,145,400 1,204,900
Operating Segments | Natural Gas Distribution | Commercial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 588,000 637,700 648,500
Operating Segments | Natural Gas Distribution | Industrial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 172,500 186,800 199,700
Operating Segments | Natural Gas Distribution | Total Retail Tariff Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 1,889,600 1,969,900 2,053,100
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 161,900 206,700 140,800
Operating Segments | Natural Gas Distribution | Other Revenues from Contracts with Customers      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 5,100 5,600 5,600
Operating Segments | Natural Gas Distribution | Reserve for 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 2,046,300 1,796,400 1,715,300
Alternative Revenue Programs 74,200 118,900 92,700
Other Revenues 500 600 700
Operating Revenues 2,121,000 1,915,900 1,808,700
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 2,032,400 1,777,500 1,700,500
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 13,900 14,600 14,100
Operating Segments | Electric Transmission | Reserve for Revenues Subject to Refund      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 0 4,300 700
Operating Segments | Water Distribution      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 233,400 231,000 224,400
Alternative Revenue Programs (5,300) 400 (2,500)
Other Revenues 1,200 1,100 600
Operating Revenues 229,300 232,500 222,500
Operating Segments | Water Distribution | Residential      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 150,400 144,700 141,700
Operating Segments | Water Distribution | Commercial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 70,300 69,800 66,500
Operating Segments | Water Distribution | Industrial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 4,700 4,500 4,700
Operating Segments | Water Distribution | Total Retail Tariff Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 225,400 219,000 212,900
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 4,200 3,900 3,800
Operating Segments | Water Distribution | Other Revenues from Contracts with Customers      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 5,700 8,100 8,400
Operating Segments | Water Distribution | Reserve for Revenues Subject to Refund      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers (1,900) 0 (700)
Operating Segments | CL&P      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 5,222,100 5,077,600 5,343,200
Alternative Revenue Programs 45,400 66,800 56,500
Other Revenues 9,000 9,600 1,800
Operating Segments | CL&P | Residential      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 2,493,700 2,597,800 2,397,200
Operating Segments | CL&P | Commercial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 1,164,800 1,082,100 1,067,900
Operating Segments | CL&P | Industrial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 164,200 137,200 146,400
Operating Segments | CL&P | Total Retail Tariff Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 3,822,700 3,817,100 3,611,500
Operating Segments | CL&P | Wholesale Transmission Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 870,800 794,700 755,100
Operating Segments | CL&P | Wholesale Market Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 491,900 429,100 873,700
Operating Segments | CL&P | Other Revenues from Contracts with Customers      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 36,700 32,400 30,200
Operating Segments | CL&P | Reserve for Revenues Subject to Refund      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 0 4,300 72,700
Operating Segments | NSTAR Electric      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 4,332,000 4,129,400 4,127,300
Alternative Revenue Programs 36,700 (52,000) 700
Other Revenues 8,500 8,400 7,200
Operating Segments | NSTAR Electric | Residential      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 1,771,800 1,691,000 1,601,800
Operating Segments | NSTAR Electric | Commercial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 1,466,700 1,442,300 1,457,400
Operating Segments | NSTAR Electric | Industrial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 118,100 123,200 135,800
Operating Segments | NSTAR Electric | Total Retail Tariff Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 3,356,600 3,256,500 3,195,000
Operating Segments | NSTAR Electric | Wholesale Transmission Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 794,100 692,000 670,400
Operating Segments | NSTAR Electric | Wholesale Market Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 131,100 131,800 215,000
Operating Segments | NSTAR Electric | Other Revenues from Contracts with Customers      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 50,200 49,100 46,900
Operating Segments | NSTAR Electric | 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 1,514,200 1,600,000 1,659,600
Alternative Revenue Programs 20,800 49,800 20,100
Other Revenues 2,600 3,000 2,900
Operating Segments | PSNH | Residential      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 639,300 765,400 797,100
Operating Segments | PSNH | Commercial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 343,600 369,600 380,800
Operating Segments | PSNH | Industrial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 106,700 92,000 92,700
Operating Segments | PSNH | Total Retail Tariff Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 1,089,600 1,227,000 1,270,600
Operating Segments | PSNH | Wholesale Transmission Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 367,500 290,800 275,000
Operating Segments | PSNH | Wholesale Market Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 35,900 64,100 102,200
Operating Segments | PSNH | Other Revenues from Contracts with Customers      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 21,200 18,100 11,800
Operating Segments | PSNH | Reserve for 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 1,701,300 1,636,600 1,435,500
Alternative Revenue Programs 0 0 0
Other Revenues 0 0 0
Operating Revenues 1,701,300 1,636,600 1,435,500
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 0
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 1,701,300 1,636,600 1,435,500
Other | Reserve for 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 (3,254,000) (2,963,000) (2,714,000)
Alternative Revenue Programs (67,200) (106,500) (84,300)
Other Revenues 0 0 0
Operating Revenues (3,321,200) (3,069,500) (2,798,300)
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 (7,700) (4,800) (4,100)
Eliminations | Industrial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers (22,400) (19,700) (20,100)
Eliminations | Total Retail Tariff Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers (30,100) (24,500) (24,200)
Eliminations | Wholesale Transmission Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers (1,529,300) (1,310,500) (1,264,500)
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 (1,694,600) (1,628,000) (1,425,300)
Eliminations | Reserve for 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 (661,500) (575,200) (583,800)
Consolidations Eliminations | NSTAR Electric      
Disaggregation of Revenue [Line Items]      
Operating Revenues (656,300) (570,300) (552,100)
Consolidations Eliminations | PSNH      
Disaggregation of Revenue [Line Items]      
Operating Revenues $ (243,100) $ (204,900) $ (207,800)