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REVENUES - Operating Revenues Disaggregated by Revenue Source (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers $ 9,815,000 $ 8,766,500 $ 8,450,000
Alternative Revenue Programs 41,700 130,000 53,200
Other Revenues 6,400 7,900 23,300
Operating Revenues 9,863,085 8,904,430 8,526,470
Residential      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 5,123,600 4,741,500 4,411,100
Commercial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 3,041,400 2,772,900 2,992,000
Industrial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 499,700 425,600 421,600
Total Retail Tariff Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 8,664,700 7,940,000 7,824,700
Wholesale Transmission Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 453,200 340,900 269,400
Wholesale Market Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 661,800 374,100 275,200
Other Revenues from Contracts with Customers      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 114,000 111,500 80,700
Reserve for Revenues Subject to Refund      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers (78,700)    
The Connecticut Light and Power Company      
Disaggregation of Revenue [Line Items]      
Operating Revenues 3,637,412 3,547,527 3,232,551
NSTAR Electric Company      
Disaggregation of Revenue [Line Items]      
Operating Revenues 3,056,350 2,941,148 3,044,642
Public Service Company of New Hampshire      
Disaggregation of Revenue [Line Items]      
Operating Revenues 1,177,248 1,079,095 1,065,936
Operating Segments | Electric Distribution      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 7,404,000 7,038,600 6,912,100
Alternative Revenue Programs 14,700 88,100 45,900
Other Revenues 4,900 5,600 18,500
Operating Revenues 7,423,600 7,132,300 6,976,500
Operating Segments | Electric Distribution | Residential      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 3,989,800 3,951,500 3,723,700
Operating Segments | Electric Distribution | Commercial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 2,486,100 2,353,400 2,584,800
Operating Segments | Electric Distribution | Industrial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 345,300 327,100 331,800
Operating Segments | Electric Distribution | Total Retail Tariff Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 6,821,200 6,632,000 6,640,300
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 575,800 327,300 215,700
Operating Segments | Electric Distribution | Other Revenues from Contracts with Customers      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 78,100 79,300 56,100
Operating Segments | Electric Distribution | Reserve for Revenues Subject to Refund      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers (71,100)    
Operating Segments | Natural Gas Distribution      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 1,752,300 1,162,900 1,064,000
Alternative Revenue Programs 37,000 44,700 (4,900)
Other Revenues 300 1,100 3,100
Operating Revenues 1,789,600 1,208,700 1,062,200
Operating Segments | Natural Gas Distribution | Residential      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 1,000,300 644,900 555,100
Operating Segments | Natural Gas Distribution | Commercial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 497,600 361,900 347,600
Operating Segments | Natural Gas Distribution | Industrial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 167,200 107,400 96,900
Operating Segments | Natural Gas Distribution | Total Retail Tariff Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 1,665,100 1,114,200 999,600
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 82,100 43,000 55,400
Operating Segments | Natural Gas Distribution | Other Revenues from Contracts with Customers      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 5,100 5,700 9,000
Operating Segments | Natural Gas Distribution | Reserve for Revenues Subject to Refund      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 0    
Operating Segments | Electric Transmission      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 1,759,900 1,570,600 1,306,500
Alternative Revenue Programs (126,100) (35,200) 81,800
Other Revenues 800 700 700
Operating Revenues 1,634,600 1,536,100 1,389,000
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 1,751,300 1,557,300 1,293,300
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 13,600 13,300 13,200
Operating Segments | Electric Transmission | Reserve for Revenues Subject to Refund      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers (5,000)    
Operating Segments | Water Distribution      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 209,400 219,600 209,000
Alternative Revenue Programs 1,500 (4,700) 4,600
Other Revenues 400 500 1,000
Operating Revenues 211,300 215,400 214,600
Operating Segments | Water Distribution | Residential      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 133,500 145,100 132,300
Operating Segments | Water Distribution | Commercial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 62,800 62,400 63,900
Operating Segments | Water Distribution | Industrial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 4,300 4,800 4,500
Operating Segments | Water Distribution | Total Retail Tariff Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 200,600 212,300 200,700
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 4,100
Operating Segments | Water Distribution | Other Revenues from Contracts with Customers      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 7,500 3,500 4,200
Operating Segments | Water Distribution | Reserve for Revenues Subject to Refund      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers (2,600)    
Operating Segments | The Connecticut Light and Power Company      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 4,238,900 4,044,700 3,626,900
Alternative Revenue Programs (78,900) (4,200) 77,500
Other Revenues 400 2,200 10,300
Operating Segments | The Connecticut Light and Power Company | Residential      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 1,994,200 2,011,100 1,837,100
Operating Segments | The Connecticut Light and Power Company | Commercial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 890,600 878,300 922,900
Operating Segments | The Connecticut Light and Power Company | Industrial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 131,400 137,500 138,300
Operating Segments | The Connecticut Light and Power Company | Total Retail Tariff Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 3,016,200 3,026,900 2,898,300
Operating Segments | The Connecticut Light and Power Company | Wholesale Transmission Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 863,300 754,800 587,100
Operating Segments | The Connecticut Light and Power Company | Wholesale Market Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 408,800 230,100 105,100
Operating Segments | The Connecticut Light and Power Company | Other Revenues from Contracts with Customers      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 26,700 32,900 36,400
Operating Segments | The Connecticut Light and Power Company | Reserve for Revenues Subject to Refund      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers (76,100) 0 0
Operating Segments | NSTAR Electric Company      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 3,541,600 3,327,500 3,396,400
Alternative Revenue Programs (15,100) 54,500 41,600
Other Revenues 3,400 3,500 7,000
Operating Segments | NSTAR Electric Company | Residential      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 1,375,800 1,365,800 1,322,100
Operating Segments | NSTAR Electric Company | Commercial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 1,265,000 1,176,800 1,349,400
Operating Segments | NSTAR Electric Company | Industrial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 119,100 106,400 115,800
Operating Segments | NSTAR Electric Company | Total Retail Tariff Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 2,759,900 2,649,000 2,787,300
Operating Segments | NSTAR Electric Company | Wholesale Transmission Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 616,300 576,500 517,300
Operating Segments | NSTAR Electric Company | Wholesale Market Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 109,200 58,400 73,100
Operating Segments | NSTAR Electric Company | Other Revenues from Contracts with Customers      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 56,200 43,600 18,700
Operating Segments | NSTAR Electric Company | Reserve for Revenues Subject to Refund      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 0 0 0
Operating Segments | Public Service Company of New Hampshire      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 1,387,600 1,241,300 1,200,100
Alternative Revenue Programs (17,400) 2,600 8,600
Other Revenues 1,900 600 1,900
Operating Segments | Public Service Company of New Hampshire | Residential      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 619,800 574,600 564,500
Operating Segments | Public Service Company of New Hampshire | Commercial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 332,200 299,900 314,600
Operating Segments | Public Service Company of New Hampshire | Industrial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 94,800 83,200 77,700
Operating Segments | Public Service Company of New Hampshire | Total Retail Tariff Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 1,046,800 957,700 956,800
Operating Segments | Public Service Company of New Hampshire | Wholesale Transmission Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 271,700 226,000 188,900
Operating Segments | Public Service Company of New Hampshire | Wholesale Market Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 57,800 38,800 37,500
Operating Segments | Public Service Company of New Hampshire | Other Revenues from Contracts with Customers      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 11,300 14,200 15,600
Operating Segments | Public Service Company of New Hampshire | Reserve for Revenues Subject to Refund      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 0 4,600 1,300
Other      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 1,354,000 1,235,900 1,028,500
Alternative Revenue Programs 0 0 0
Other Revenues 0 0 0
Operating Revenues 1,354,000 1,235,900 1,028,500
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 86,600 74,200 61,300
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 1,267,400 1,161,700 967,200
Other | 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 (2,664,600) (2,461,100) (2,070,100)
Alternative Revenue Programs 114,600 37,100 (74,200)
Other Revenues 0 0 0
Operating Revenues (2,550,000) (2,424,000) (2,144,300)
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 (5,100) (4,800) (4,300)
Eliminations | Industrial      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers (17,100) (13,700) (11,600)
Eliminations | Total Retail Tariff Sales Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers (22,200) (18,500) (15,900)
Eliminations | Wholesale Transmission Revenues      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers (1,384,700) (1,290,600) (1,085,200)
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 (1,257,700) (1,152,000) (969,000)
Eliminations | Reserve for Revenues Subject to Refund      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 0    
Consolidations Eliminations | The Connecticut Light and Power Company      
Disaggregation of Revenue [Line Items]      
Operating Revenues (523,000) (495,200) (482,100)
Consolidations Eliminations | NSTAR Electric Company      
Disaggregation of Revenue [Line Items]      
Operating Revenues (473,500) (444,400) (400,400)
Consolidations Eliminations | Public Service Company of New Hampshire      
Disaggregation of Revenue [Line Items]      
Operating Revenues $ (194,900) $ (165,400) $ (144,700)