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REVENUES (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2021
Sep. 01, 2021
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers $ 2,625,600 $ 2,561,600 $ 6,377,500 $ 6,013,700    
Alternative Revenue Programs (2,700) 8,200 34,200 23,900    
Other Revenues 6,400 2,800 13,300 6,400    
Operating Revenues 2,629,342 2,572,641 6,424,985 6,043,951    
Customer Credits Distributed in 2022 at CL&P related to PURA Settlement Agreement and Storm Performance Penalty     0 (64,909)    
CL&P            
Disaggregation of Revenue [Line Items]            
Operating Revenues 1,034,148 1,035,682 2,373,054 2,321,514    
Customer Credits Distributed in 2022 at CL&P related to PURA Settlement Agreement and Storm Performance Penalty     0 (64,909)    
CL&P | Unfavorable Regulatory Action            
Disaggregation of Revenue [Line Items]            
Loss contingency, estimate of possible earnings impact, non-compliance with performance standards           $ 28,400
CL&P | Unfavorable Regulatory Action | Sales            
Disaggregation of Revenue [Line Items]            
Customer Credits Distributed in 2022 at CL&P related to PURA Settlement Agreement and Storm Performance Penalty         $ 65,000  
NSTAR Electric            
Disaggregation of Revenue [Line Items]            
Operating Revenues 818,968 783,650 1,775,251 1,646,825    
PSNH            
Disaggregation of Revenue [Line Items]            
Operating Revenues 350,070 307,055 770,225 646,482    
Total Retail Tariff Sales Revenues            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 2,341,700 2,189,000 5,688,800 5,046,800    
Residential            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 1,379,500 1,258,600 3,449,000 3,029,700    
Commercial            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 839,000 802,000 1,961,900 1,734,400    
Industrial            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 123,200 128,400 277,900 282,700    
Wholesale Transmission Revenues            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 99,200 93,200 209,000 199,200    
Wholesale Market Sales Revenues            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 153,100 246,700 420,300 646,500    
Other Revenues from Contracts with Customers            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 31,600 32,700 59,400 56,300    
Amortization of/(Reserve for) Revenues Subject to Refund            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers       64,900    
Operating Segments | CL&P            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 1,124,200 1,091,300 2,576,000 2,521,500    
Alternative Revenue Programs 52,600 92,200 77,300 93,400    
Other Revenues 2,500 200 4,700 300    
Operating Segments | NSTAR Electric            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 961,100 908,500 2,065,500 1,913,100    
Alternative Revenue Programs (5,000) 14,300 (14,500) 6,100    
Other Revenues 1,800 1,600 4,300 3,600    
Operating Segments | PSNH            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 375,600 335,300 836,700 730,400    
Alternative Revenue Programs 21,900 19,300 31,500 16,000    
Other Revenues 700 700 1,700 1,600    
Operating Segments | Total Retail Tariff Sales Revenues | CL&P            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 880,000 817,400 1,971,400 1,692,200    
Operating Segments | Total Retail Tariff Sales Revenues | NSTAR Electric            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 748,800 685,300 1,633,600 1,455,300    
Operating Segments | Total Retail Tariff Sales Revenues | PSNH            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 290,700 255,800 655,900 548,700    
Operating Segments | Residential | CL&P            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 593,700 526,100 1,355,900 1,125,200    
Operating Segments | Residential | NSTAR Electric            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 370,500 326,900 838,300 731,500    
Operating Segments | Residential | PSNH            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 178,000 151,800 412,000 334,300    
Operating Segments | Commercial | CL&P            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 255,000 255,300 550,300 497,500    
Operating Segments | Commercial | NSTAR Electric            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 347,200 327,800 731,500 659,100    
Operating Segments | Commercial | PSNH            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 90,200 81,700 198,800 170,100    
Operating Segments | Industrial | CL&P            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 31,300 36,000 65,200 69,500    
Operating Segments | Industrial | NSTAR Electric            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 31,100 30,600 63,800 64,700    
Operating Segments | Industrial | PSNH            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 22,500 22,300 45,100 44,300    
Operating Segments | Wholesale Transmission Revenues | CL&P            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 172,500 115,800 368,300 325,000    
Operating Segments | Wholesale Transmission Revenues | NSTAR Electric            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 166,900 163,600 334,700 328,800    
Operating Segments | Wholesale Transmission Revenues | PSNH            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 63,600 55,100 135,100 126,900    
Operating Segments | Wholesale Market Sales Revenues | CL&P            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 62,900 143,400 217,600 423,400    
Operating Segments | Wholesale Market Sales Revenues | NSTAR Electric            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 32,500 47,800 73,600 105,600    
Operating Segments | Wholesale Market Sales Revenues | PSNH            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 16,900 21,400 38,400 49,100    
Operating Segments | Other Revenues from Contracts with Customers | CL&P            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 8,800 14,700 17,000 15,300    
Operating Segments | Other Revenues from Contracts with Customers | NSTAR Electric            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 12,900 11,800 23,600 23,400    
Operating Segments | Other Revenues from Contracts with Customers | PSNH            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 4,400 3,000 7,300 5,700    
Operating Segments | Amortization of/(Reserve for) Revenues Subject to Refund | CL&P            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers     1,700 65,600    
Operating Segments | Amortization of/(Reserve for) Revenues Subject to Refund | NSTAR Electric            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers     0 0    
Operating Segments | Amortization of/(Reserve for) Revenues Subject to Refund | PSNH            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers     0 0    
Operating Segments | Amortization Of (Reserves For) Revenues Subject To Refund | CL&P | Unfavorable Regulatory Action            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers         $ 93,400  
Other            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 408,800 335,700 822,700 719,300    
Alternative Revenue Programs 0 0 0 0    
Other Revenues 0 0 0 0    
Operating Revenues 408,800 335,700 822,700 719,300    
Other | Total Retail Tariff Sales Revenues            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 0 0 0 0    
Other | Residential            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 0 0 0 0    
Other | Commercial            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 0 0 0 0    
Other | Industrial            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 0 0 0 0    
Other | Wholesale Transmission Revenues            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 0 25,100 0 49,600    
Other | Wholesale Market Sales Revenues            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 0 0 0 0    
Other | Other Revenues from Contracts with Customers            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 408,800 310,600 822,700 669,700    
Other | Amortization of/(Reserve for) Revenues Subject to Refund            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers       0    
Eliminations            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers (715,500) (582,700) (1,459,400) (1,306,100)    
Alternative Revenue Programs (65,700) (113,200) (82,700) (99,600)    
Other Revenues 0 0 0 0    
Operating Revenues (781,200) (695,900) (1,542,100) (1,405,700)    
Eliminations | Total Retail Tariff Sales Revenues            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers (5,900) (6,500) (12,000) (12,100)    
Eliminations | Residential            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 0 0 0 0    
Eliminations | Commercial            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers (1,200) (1,400) (2,300) (2,500)    
Eliminations | Industrial            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers (4,700) (5,100) (9,700) (9,600)    
Eliminations | Wholesale Transmission Revenues            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers (303,800) (266,400) (629,100) (631,100)    
Eliminations | Wholesale Market Sales Revenues            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 0 0 0 0    
Eliminations | Other Revenues from Contracts with Customers            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers (405,800) (309,800) (818,300) (662,900)    
Eliminations | Amortization of/(Reserve for) Revenues Subject to Refund            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers       0    
Consolidations Eliminations | CL&P            
Disaggregation of Revenue [Line Items]            
Operating Revenues (145,200) (148,000) (284,900) (293,700)    
Consolidations Eliminations | NSTAR Electric            
Disaggregation of Revenue [Line Items]            
Operating Revenues (138,900) (140,700) (280,000) (276,000)    
Consolidations Eliminations | PSNH            
Disaggregation of Revenue [Line Items]            
Operating Revenues (48,100) (48,200) (99,700) (101,500)    
Electric Distribution | Operating Segments            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 2,052,500 1,995,300 4,629,600 4,374,100    
Alternative Revenue Programs (3,000) 6,800 3,100 11,500    
Other Revenues 4,900 2,300 10,300 5,100    
Operating Revenues 2,054,400 2,004,400 4,643,000 4,390,700    
Electric Distribution | Operating Segments | Total Retail Tariff Sales Revenues            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 1,919,200 1,757,800 4,260,800 3,695,000    
Electric Distribution | Operating Segments | Residential            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 1,142,200 1,004,800 2,606,200 2,191,000    
Electric Distribution | Operating Segments | Commercial            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 692,100 664,100 1,480,500 1,325,500    
Electric Distribution | Operating Segments | Industrial            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 84,900 88,900 174,100 178,500    
Electric Distribution | Operating Segments | Wholesale Transmission Revenues            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 0 0 0 0    
Electric Distribution | Operating Segments | Wholesale Market Sales Revenues            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 112,300 212,600 329,600 578,100    
Electric Distribution | Operating Segments | Other Revenues from Contracts with Customers            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 21,000 24,900 39,200 36,100    
Electric Distribution | Operating Segments | Amortization of/(Reserve for) Revenues Subject to Refund            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers       64,900    
Natural Gas Distribution | Operating Segments            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 411,100 419,000 1,427,900 1,335,900    
Alternative Revenue Programs (3,100) (3,000) 24,300 7,200    
Other Revenues 1,100 200 2,100 700    
Operating Revenues 409,100 416,200 1,454,300 1,343,800    
Natural Gas Distribution | Operating Segments | Total Retail Tariff Sales Revenues            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 370,200 384,600 1,336,300 1,267,000    
Natural Gas Distribution | Operating Segments | Residential            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 198,400 218,500 774,900 775,300    
Natural Gas Distribution | Operating Segments | Commercial            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 129,900 122,600 450,000 380,100    
Natural Gas Distribution | Operating Segments | Industrial            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 41,900 43,500 111,400 111,600    
Natural Gas Distribution | Operating Segments | Wholesale Transmission Revenues            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 0 0 0 0    
Natural Gas Distribution | Operating Segments | Wholesale Market Sales Revenues            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 39,800 33,200 88,900 66,700    
Natural Gas Distribution | Operating Segments | Other Revenues from Contracts with Customers            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 1,100 1,200 2,700 2,200    
Natural Gas Distribution | Operating Segments | Amortization of/(Reserve for) Revenues Subject to Refund            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers       0    
Electric Transmission | Operating Segments            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 407,500 338,400 847,200 788,400    
Alternative Revenue Programs 72,500 119,000 91,200 104,000    
Other Revenues 100 200 400 400    
Operating Revenues 480,100 457,600 938,800 892,800    
Electric Transmission | Operating Segments | Total Retail Tariff Sales Revenues            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 0 0 0 0    
Electric Transmission | Operating Segments | Residential            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 0 0 0 0    
Electric Transmission | Operating Segments | Commercial            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 0 0 0 0    
Electric Transmission | Operating Segments | Industrial            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 0 0 0 0    
Electric Transmission | Operating Segments | Wholesale Transmission Revenues            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 403,000 334,500 838,100 780,700    
Electric Transmission | Operating Segments | Wholesale Market Sales Revenues            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 0 0 0 0    
Electric Transmission | Operating Segments | Other Revenues from Contracts with Customers            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 4,500 3,900 9,100 7,000    
Electric Transmission | Operating Segments | Amortization of/(Reserve for) Revenues Subject to Refund            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers       700    
Water Distribution | Operating Segments            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 61,200 55,900 109,500 102,100    
Alternative Revenue Programs (3,400) (1,400) (1,700) 800    
Other Revenues 300 100 500 200    
Operating Revenues 58,100 54,600 108,300 103,100    
Water Distribution | Operating Segments | Total Retail Tariff Sales Revenues            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 58,200 53,100 103,700 96,900    
Water Distribution | Operating Segments | Residential            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 38,900 35,300 67,900 63,400    
Water Distribution | Operating Segments | Commercial            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 18,200 16,700 33,700 31,300    
Water Distribution | Operating Segments | Industrial            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 1,100 1,100 2,100 2,200    
Water Distribution | Operating Segments | Wholesale Transmission Revenues            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 0 0 0 0    
Water Distribution | Operating Segments | Wholesale Market Sales Revenues            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 1,000 900 1,800 1,700    
Water Distribution | Operating Segments | Other Revenues from Contracts with Customers            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers $ 2,000 $ 1,900 $ 4,000 4,200    
Water Distribution | Operating Segments | Amortization of/(Reserve for) Revenues Subject to Refund            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers       $ (700)