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REVENUES (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2021
Sep. 01, 2021
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers $ 2,833,500 $ 3,259,400 $ 9,211,000 $ 9,273,000    
Alternative Revenue Programs (48,200) (46,600) (14,000) (22,700)    
Other Revenues 6,200 2,800 19,500 9,300    
Operating Revenues 2,791,482 3,215,645 9,216,467 9,259,596    
Customer Credits Distributed in 2022 at CL&P related to PURA Settlement Agreement and Storm Performance Penalty     0 (72,041)    
CL&P            
Disaggregation of Revenue [Line Items]            
Operating Revenues 1,190,096 1,369,101 3,563,150 3,690,614    
Customer Credits Distributed in 2022 at CL&P related to PURA Settlement Agreement and Storm Performance Penalty     0 (72,041)    
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 953,531 1,105,452 2,728,782 2,752,278    
PSNH            
Disaggregation of Revenue [Line Items]            
Operating Revenues 353,074 430,642 1,123,300 1,077,124    
Total Retail Tariff Sales Revenues            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 2,441,000 2,752,600 8,129,800 7,799,600    
Residential            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 1,503,600 1,633,300 4,952,700 4,663,000    
Commercial            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 816,300 984,000 2,778,100 2,718,600    
Industrial            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 121,100 135,300 399,000 418,000    
Wholesale Transmission Revenues            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 133,600 133,900 342,600 333,100    
Wholesale Market Sales Revenues            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 227,600 340,900 647,800 987,300    
Other Revenues from Contracts with Customers            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 31,300 25,100 90,800 81,300    
Amortization of/(Reserve for) Revenues Subject to Refund            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers   6,900   71,700    
Operating Segments | CL&P            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 1,396,200 1,589,900 3,972,200 4,111,400    
Alternative Revenue Programs (49,300) (65,100) 28,000 28,300    
Other Revenues 2,400 200 7,100 500    
Operating Segments | NSTAR Electric            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 1,129,200 1,268,500 3,194,500 3,181,700    
Alternative Revenue Programs (29,000) (20,500) (43,500) (14,400)    
Other Revenues 1,900 1,800 6,300 5,400    
Operating Segments | PSNH            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 411,000 497,000 1,247,700 1,227,400    
Alternative Revenue Programs 900 (7,200) 32,400 8,800    
Other Revenues 700 600 2,300 2,100    
Operating Segments | Total Retail Tariff Sales Revenues | CL&P            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 1,029,300 1,092,200 3,000,700 2,784,500    
Operating Segments | Total Retail Tariff Sales Revenues | NSTAR Electric            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 901,800 1,016,500 2,535,400 2,471,800    
Operating Segments | Total Retail Tariff Sales Revenues | PSNH            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 303,800 381,000 959,700 929,700    
Operating Segments | Residential | CL&P            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 703,900 739,100 2,059,900 1,864,400    
Operating Segments | Residential | NSTAR Electric            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 480,500 507,600 1,318,700 1,239,000    
Operating Segments | Residential | PSNH            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 191,500 246,200 603,500 580,500    
Operating Segments | Commercial | CL&P            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 286,400 311,200 836,700 808,700    
Operating Segments | Commercial | NSTAR Electric            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 389,400 469,600 1,121,000 1,128,800    
Operating Segments | Commercial | PSNH            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 88,700 110,400 287,500 280,500    
Operating Segments | Industrial | CL&P            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 39,000 41,900 104,100 111,400    
Operating Segments | Industrial | NSTAR Electric            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 31,900 39,300 95,700 104,000    
Operating Segments | Industrial | PSNH            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 23,600 24,400 68,700 68,700    
Operating Segments | Wholesale Transmission Revenues | CL&P            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 245,100 250,300 613,300 575,200    
Operating Segments | Wholesale Transmission Revenues | NSTAR Electric            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 186,400 183,800 521,000 512,700    
Operating Segments | Wholesale Transmission Revenues | PSNH            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 88,700 86,200 223,900 213,100    
Operating Segments | Wholesale Market Sales Revenues | CL&P            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 112,800 232,900 330,400 656,300    
Operating Segments | Wholesale Market Sales Revenues | NSTAR Electric            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 28,600 57,500 102,100 163,100    
Operating Segments | Wholesale Market Sales Revenues | PSNH            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 13,500 26,700 51,900 75,800    
Operating Segments | Other Revenues from Contracts with Customers | CL&P            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 7,700 7,500 24,700 22,800    
Operating Segments | Other Revenues from Contracts with Customers | NSTAR Electric            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 12,400 10,700 36,000 34,100    
Operating Segments | Other Revenues from Contracts with Customers | PSNH            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 5,000 3,100 12,200 8,800    
Operating Segments | Amortization of/(Reserve for) Revenues Subject to Refund | CL&P            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 1,300 7,000 3,100 72,600    
Operating Segments | Amortization of/(Reserve for) Revenues Subject to Refund | NSTAR Electric            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 0 0 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 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 394,700 343,500 1,217,300 1,062,700    
Alternative Revenue Programs 0 0 0 0    
Other Revenues 0 0 0 0    
Operating Revenues 394,700 343,500 1,217,300 1,062,700    
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 29,900 0 79,400    
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 394,700 313,600 1,217,300 983,300    
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 (784,900) (735,100) (2,244,300) (2,041,200)    
Alternative Revenue Programs 31,900 52,600 (50,800) (46,900)    
Other Revenues 0 0 0 0    
Operating Revenues (753,000) (682,500) (2,295,100) (2,088,100)    
Eliminations | Total Retail Tariff Sales Revenues            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers (5,900) (6,900) (18,000) (19,000)    
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 (1,100) (1,700) (3,400) (4,200)    
Eliminations | Industrial            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers (4,800) (5,200) (14,600) (14,800)    
Eliminations | Wholesale Transmission Revenues            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers (386,600) (416,300) (1,015,600) (1,047,300)    
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 (392,400) (311,900) (1,210,700) (974,900)    
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 (159,200) (155,900) (444,100) (449,600)    
Consolidations Eliminations | NSTAR Electric            
Disaggregation of Revenue [Line Items]            
Operating Revenues (148,600) (144,300) (428,500) (420,400)    
Consolidations Eliminations | PSNH            
Disaggregation of Revenue [Line Items]            
Operating Revenues (59,500) (59,800) (159,100) (161,200)    
Electric Distribution | Operating Segments            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 2,410,300 2,830,400 7,039,800 7,204,500    
Alternative Revenue Programs (43,800) (37,700) (40,700) (26,200)    
Other Revenues 4,800 2,400 15,200 7,500    
Operating Revenues 2,371,300 2,795,100 7,014,300 7,185,800    
Electric Distribution | Operating Segments | Total Retail Tariff Sales Revenues            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 2,234,500 2,489,000 6,495,300 6,184,000    
Electric Distribution | Operating Segments | Residential            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 1,375,900 1,492,900 3,982,100 3,683,900    
Electric Distribution | Operating Segments | Commercial            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 764,100 890,500 2,244,700 2,216,000    
Electric Distribution | Operating Segments | Industrial            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 94,500 105,600 268,500 284,100    
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 154,900 317,100 484,400 895,200    
Electric Distribution | Operating Segments | Other Revenues from Contracts with Customers            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 20,900 17,300 60,100 53,400    
Electric Distribution | Operating Segments | Amortization of/(Reserve for) Revenues Subject to Refund            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers   7,000   71,900    
Natural Gas Distribution | Operating Segments            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 219,800 228,300 1,647,700 1,564,200    
Alternative Revenue Programs (2,400) (2,800) 21,900 4,300    
Other Revenues 900 100 3,000 900    
Operating Revenues 218,300 225,600 1,672,600 1,569,400    
Natural Gas Distribution | Operating Segments | Total Retail Tariff Sales Revenues            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 146,900 205,000 1,483,300 1,472,100    
Natural Gas Distribution | Operating Segments | Residential            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 83,000 94,700 858,000 870,000    
Natural Gas Distribution | Operating Segments | Commercial            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 33,700 76,700 483,600 456,900    
Natural Gas Distribution | Operating Segments | Industrial            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 30,200 33,600 141,700 145,200    
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 71,600 22,700 160,500 89,300    
Natural Gas Distribution | Operating Segments | Other Revenues from Contracts with Customers            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 1,300 600 3,900 2,800    
Natural Gas Distribution | Operating Segments | Amortization of/(Reserve for) Revenues Subject to Refund            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers   0   0    
Electric Transmission | Operating Segments            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 525,000 523,700 1,372,300 1,312,200    
Alternative Revenue Programs (33,600) (55,100) 57,600 48,900    
Other Revenues 200 200 500 500    
Operating Revenues 491,600 468,800 1,430,400 1,361,600    
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 520,200 520,300 1,358,200 1,301,000    
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 4,800 3,400 14,100 10,500    
Electric Transmission | Operating Segments | Amortization of/(Reserve for) Revenues Subject to Refund            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers   0   700    
Water Distribution | Operating Segments            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 68,600 68,600 178,200 170,600    
Alternative Revenue Programs (300) (3,600) (2,000) (2,800)    
Other Revenues 300 100 800 400    
Operating Revenues 68,600 65,100 177,000 168,200    
Water Distribution | Operating Segments | Total Retail Tariff Sales Revenues            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 65,500 65,500 169,200 162,500    
Water Distribution | Operating Segments | Residential            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 44,700 45,700 112,600 109,100    
Water Distribution | Operating Segments | Commercial            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 19,600 18,500 53,200 49,900    
Water Distribution | Operating Segments | Industrial            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers 1,200 1,300 3,400 3,500    
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 1,100 1,100 2,900 2,800    
Water Distribution | Operating Segments | Other Revenues from Contracts with Customers            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers $ 2,000 2,100 $ 6,100 6,200    
Water Distribution | Operating Segments | Amortization of/(Reserve for) Revenues Subject to Refund            
Disaggregation of Revenue [Line Items]            
Revenues from Contracts with Customers   $ (100)   $ (900)