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REVENUES (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2021
Sep. 01, 2021
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers $ 3,751,800 $ 3,452,000    
Alternative Revenue Programs 36,900 15,800    
Other Revenues 6,900 3,500    
Operating Revenues 3,795,643 3,471,310    
Customer Credits at CL&P related to PURA Settlement Agreement and Storm Performance Penalty 0 (58,412)    
CL&P        
Disaggregation of Revenue [Line Items]        
Operating Revenues 1,338,905 1,285,831    
Customer Credits at CL&P related to PURA Settlement Agreement and Storm Performance Penalty 0 (58,412)    
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 at CL&P related to PURA Settlement Agreement and Storm Performance Penalty     $ 65,000  
NSTAR Electric        
Disaggregation of Revenue [Line Items]        
Operating Revenues 956,283 863,176    
PSNH        
Disaggregation of Revenue [Line Items]        
Operating Revenues 420,155 339,427    
Total Retail Tariff Sales Revenues        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 3,347,100 2,857,900    
Residential        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 2,069,500 1,771,200    
Commercial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 1,122,900 932,400    
Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 154,700 154,300    
Wholesale Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 109,700 105,900    
Wholesale Market Sales Revenues        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 267,200 399,800    
Other Revenues from Contracts with Customers        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 27,800 30,400    
Amortization of/(Reserve for) Revenues Subject to Refund        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers   58,000    
Operating Segments | CL&P        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 1,451,800 1,430,100    
Alternative Revenue Programs 24,600 1,300    
Other Revenues 2,200 100    
Operating Segments | NSTAR Electric        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 1,104,400 1,004,700    
Alternative Revenue Programs (9,500) (8,200)    
Other Revenues 2,500 2,000    
Operating Segments | PSNH        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 461,100 395,100    
Alternative Revenue Programs 9,600 (3,300)    
Other Revenues 1,000 900    
Operating Segments | Total Retail Tariff Sales Revenues | CL&P        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 1,091,400 874,800    
Operating Segments | Total Retail Tariff Sales Revenues | NSTAR Electric        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 884,700 770,000    
Operating Segments | Total Retail Tariff Sales Revenues | PSNH        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 365,200 292,900    
Operating Segments | Residential | CL&P        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 762,200 599,100    
Operating Segments | Residential | NSTAR Electric        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 467,800 404,600    
Operating Segments | Residential | PSNH        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 234,000 182,500    
Operating Segments | Commercial | CL&P        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 295,300 242,200    
Operating Segments | Commercial | NSTAR Electric        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 384,300 331,300    
Operating Segments | Commercial | PSNH        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 108,600 88,400    
Operating Segments | Industrial | CL&P        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 33,900 33,500    
Operating Segments | Industrial | NSTAR Electric        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 32,600 34,100    
Operating Segments | Industrial | PSNH        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 22,600 22,000    
Operating Segments | Wholesale Transmission Revenues | CL&P        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 195,800 209,100    
Operating Segments | Wholesale Transmission Revenues | NSTAR Electric        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 167,800 165,200    
Operating Segments | Wholesale Transmission Revenues | PSNH        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 71,400 71,900    
Operating Segments | Wholesale Market Sales Revenues | CL&P        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 154,600 279,900    
Operating Segments | Wholesale Market Sales Revenues | NSTAR Electric        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 41,100 57,900    
Operating Segments | Wholesale Market Sales Revenues | PSNH        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 21,600 27,700    
Operating Segments | Other Revenues from Contracts with Customers | CL&P        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 9,300 7,900    
Operating Segments | Other Revenues from Contracts with Customers | NSTAR Electric        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 10,800 11,600    
Operating Segments | Other Revenues from Contracts with Customers | PSNH        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 2,900 2,600    
Operating Segments | Amortization of/(Reserve for) Revenues Subject to Refund | CL&P        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 700 58,400    
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 413,800 383,500    
Alternative Revenue Programs 0 0    
Other Revenues 0 0    
Operating Revenues 413,800 383,500    
Other | Total Retail Tariff Sales Revenues        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 0 0    
Other | Residential        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 0 0    
Other | Commercial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 0 0    
Other | Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 0 0    
Other | Wholesale Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 0 24,400    
Other | Wholesale Market Sales Revenues        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 0 0    
Other | Other Revenues from Contracts with Customers        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 413,800 359,100    
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 (744,000) (723,400)    
Alternative Revenue Programs (16,900) 13,600    
Other Revenues 0 0    
Operating Revenues (760,900) (709,800)    
Eliminations | Total Retail Tariff Sales Revenues        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers (6,100) (5,600)    
Eliminations | Residential        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 0 0    
Eliminations | Commercial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers (1,000) (1,100)    
Eliminations | Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers (5,100) (4,500)    
Eliminations | Wholesale Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers (325,300) (364,700)    
Eliminations | Wholesale Market Sales Revenues        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 0 0    
Eliminations | Other Revenues from Contracts with Customers        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers (412,600) (353,100)    
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 (139,700) (145,700)    
Consolidations Eliminations | NSTAR Electric        
Disaggregation of Revenue [Line Items]        
Operating Revenues (141,100) (135,300)    
Consolidations Eliminations | PSNH        
Disaggregation of Revenue [Line Items]        
Operating Revenues (51,500) (53,300)    
Electric Distribution | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 2,577,100 2,378,700    
Alternative Revenue Programs 6,000 4,800    
Other Revenues 5,500 2,800    
Operating Revenues 2,588,600 2,386,300    
Electric Distribution | Operating Segments | Total Retail Tariff Sales Revenues        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 2,341,500 1,937,100    
Electric Distribution | Operating Segments | Residential        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 1,464,000 1,186,200    
Electric Distribution | Operating Segments | Commercial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 788,400 661,300    
Electric Distribution | Operating Segments | Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 89,100 89,600    
Electric Distribution | Operating Segments | Wholesale Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 0 0    
Electric Distribution | Operating Segments | Wholesale Market Sales Revenues        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 217,300 365,500    
Electric Distribution | Operating Segments | Other Revenues from Contracts with Customers        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 18,300 17,700    
Electric Distribution | Operating Segments | Amortization of/(Reserve for) Revenues Subject to Refund        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers   58,400    
Natural Gas Distribution | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 1,016,800 917,000    
Alternative Revenue Programs 27,400 10,200    
Other Revenues 1,000 400    
Operating Revenues 1,045,200 927,600    
Natural Gas Distribution | Operating Segments | Total Retail Tariff Sales Revenues        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 966,200 882,500    
Natural Gas Distribution | Operating Segments | Residential        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 576,600 556,800    
Natural Gas Distribution | Operating Segments | Commercial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 320,000 257,600    
Natural Gas Distribution | Operating Segments | Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 69,600 68,100    
Natural Gas Distribution | Operating Segments | Wholesale Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 0 0    
Natural Gas Distribution | Operating Segments | Wholesale Market Sales Revenues        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 49,100 33,500    
Natural Gas Distribution | Operating Segments | Other Revenues from Contracts with Customers        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 1,500 1,000    
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 439,700 450,000    
Alternative Revenue Programs 18,700 (15,000)    
Other Revenues 200 200    
Operating Revenues 458,600 435,200    
Electric Transmission | Operating Segments | Total Retail Tariff Sales Revenues        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 0 0    
Electric Transmission | Operating Segments | Residential        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 0 0    
Electric Transmission | Operating Segments | Commercial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 0 0    
Electric Transmission | Operating Segments | Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 0 0    
Electric Transmission | Operating Segments | Wholesale Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 435,000 446,200    
Electric Transmission | Operating Segments | Wholesale Market Sales Revenues        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 0 0    
Electric Transmission | Operating Segments | Other Revenues from Contracts with Customers        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 4,700 3,800    
Electric Transmission | Operating Segments | Amortization of/(Reserve for) Revenues Subject to Refund        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers   0    
Water Distribution | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 48,400 46,200    
Alternative Revenue Programs 1,700 2,200    
Other Revenues 200 100    
Operating Revenues 50,300 48,500    
Water Distribution | Operating Segments | Total Retail Tariff Sales Revenues        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 45,500 43,900    
Water Distribution | Operating Segments | Residential        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 28,900 28,200    
Water Distribution | Operating Segments | Commercial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 15,500 14,600    
Water Distribution | Operating Segments | Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 1,100 1,100    
Water Distribution | Operating Segments | Wholesale Transmission Revenues        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 0 0    
Water Distribution | Operating Segments | Wholesale Market Sales Revenues        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 800 800    
Water Distribution | Operating Segments | Other Revenues from Contracts with Customers        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers $ 2,100 1,900    
Water Distribution | Operating Segments | Amortization of/(Reserve for) Revenues Subject to Refund        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers   $ (400)