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REVENUES (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers $ 1,947,200 $ 1,868,200 $ 4,241,700 $ 4,265,600
Alternative Revenue Programs 4,900 10,100 79,400 24,800
Other Revenues 1,000 6,200 5,800 9,900
Operating Revenues 1,953,128 1,884,495 4,326,854 4,300,287
Lease revenue 1,100 1,100 2,200 2,200
Residential        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 1,071,800 938,800 2,301,300 2,257,900
Commercial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 608,400 697,400 1,363,700 1,506,900
Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 96,600 103,100 202,700 214,500
Total Retail Tariff Sale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 1,776,800 1,739,300 3,867,700 3,979,300
Transmission Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 70,400 56,100 140,500 123,700
Wholesale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 71,500 54,700 176,500 128,800
Other Revenues from Contracts with Customers        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 26,600 20,300 53,000 38,000
Amortization/(Reserve) for Revenues Subject to Refund        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 1,900 (2,200) 4,000 (4,200)
Other        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 283,800 250,800 578,500 509,000
Alternative Revenue Programs 0 0 0 0
Other Revenues 0 0 0 0
Operating Revenues 283,800 250,800 578,500 509,000
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 | Total Retail Tariff Sale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 0 0 0 0
Other | Transmission Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 19,200 14,700 36,600 28,300
Other | Wholesale Revenue        
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 264,600 236,100 541,900 480,700
Other | Amortization/(Reserve) for Revenues Subject to Refund        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 0 0 0 0
Eliminations        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers (599,700) (480,300) (1,163,600) (1,000,400)
Alternative Revenue Programs 9,400 (58,800) (18,100) (69,800)
Other Revenues 0 0 0 0
Operating Revenues (590,300) (539,100) (1,181,700) (1,070,200)
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 (1,300) (900) (2,300) (2,000)
Eliminations | Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers (3,400) (2,800) (6,600) (5,500)
Eliminations | Total Retail Tariff Sale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers (4,700) (3,700) (8,900) (7,500)
Eliminations | Transmission Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers (332,200) (239,800) (615,800) (510,700)
Eliminations | Wholesale Revenue        
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 (262,800) (236,800) (538,900) (482,200)
Eliminations | Amortization/(Reserve) for Revenues Subject to Refund        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 0 0 0 0
Electric Distribution | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 1,601,300 1,550,500 3,364,300 3,379,400
Alternative Revenue Programs 14,200 6,300 53,100 8,400
Other Revenues 700 5,000 4,200 7,800
Operating Revenues 1,616,200 1,561,800 3,421,600 3,395,600
Electric Distribution | Operating Segments | Residential        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 916,000 805,000 1,879,700 1,838,300
Electric Distribution | Operating Segments | Commercial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 526,000 612,800 1,133,000 1,265,300
Electric Distribution | Operating Segments | Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 77,700 81,300 157,500 163,400
Electric Distribution | Operating Segments | Total Retail Tariff Sale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 1,519,700 1,499,100 3,170,200 3,267,000
Electric Distribution | Operating Segments | Transmission Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 0 0 0 0
Electric Distribution | Operating Segments | Wholesale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 60,500 39,400 151,500 90,800
Electric Distribution | Operating Segments | Other Revenues from Contracts with Customers        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 18,800 15,100 38,000 27,700
Electric Distribution | Operating Segments | Amortization/(Reserve) for Revenues Subject to Refund        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 2,300 (3,100) 4,600 (6,100)
Natural Gas Distribution | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 216,500 209,500 632,000 667,400
Alternative Revenue Programs (5,300) (2,700) 26,900 7,700
Other Revenues 0 900 900 1,500
Operating Revenues 211,200 207,700 659,800 676,600
Natural Gas Distribution | Operating Segments | Residential        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 116,100 100,200 354,100 359,100
Natural Gas Distribution | Operating Segments | Commercial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 67,800 69,500 202,400 213,300
Natural Gas Distribution | Operating Segments | Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 21,100 23,500 49,500 54,400
Natural Gas Distribution | Operating Segments | Total Retail Tariff Sale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 205,000 193,200 606,000 626,800
Natural Gas Distribution | Operating Segments | Transmission Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 0 0 0 0
Natural Gas Distribution | Operating Segments | Wholesale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 10,100 14,400 23,200 36,100
Natural Gas Distribution | Operating Segments | Other Revenues from Contracts with Customers        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 900 400 1,700 1,400
Natural Gas Distribution | Operating Segments | Amortization/(Reserve) for Revenues Subject to Refund        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 500 1,500 1,100 3,100
Electric Transmission | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 386,700 284,900 726,300 613,000
Alternative Revenue Programs (10,200) 64,600 19,600 77,000
Other Revenues 200 100 400 100
Operating Revenues 376,700 349,600 746,300 690,100
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 | Total Retail Tariff Sale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 0 0 0 0
Electric Transmission | Operating Segments | Transmission Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 383,400 281,200 719,700 606,100
Electric Transmission | Operating Segments | Wholesale Revenue        
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 3,300 3,700 6,600 6,900
Electric Transmission | Operating Segments | Amortization/(Reserve) for Revenues Subject to Refund        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 0 0 0 0
Water Distribution | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 58,600 52,800 104,200 97,200
Alternative Revenue Programs (3,200) 700 (2,100) 1,500
Other Revenues 100 200 300 500
Operating Revenues 55,500 53,700 102,400 99,200
Water Distribution | Operating Segments | Residential        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 39,700 33,600 67,500 60,500
Water Distribution | Operating Segments | Commercial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 15,900 16,000 30,600 30,300
Water Distribution | Operating Segments | Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 1,200 1,100 2,300 2,200
Water Distribution | Operating Segments | Total Retail Tariff Sale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 56,800 50,700 100,400 93,000
Water Distribution | Operating Segments | Transmission Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 0 0 0 0
Water Distribution | Operating Segments | Wholesale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 900 900 1,800 1,900
Water Distribution | Operating Segments | Other Revenues from Contracts with Customers        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 1,800 1,800 3,700 3,500
Water Distribution | Operating Segments | Amortization/(Reserve) for Revenues Subject to Refund        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers (900) (600) (1,700) (1,200)
CL&P        
Disaggregation of Revenue [Line Items]        
Operating Revenues 817,421 740,846 1,717,124 1,590,092
Lease revenue 200 300 400 500
CL&P | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 940,700 798,400 1,916,300 1,757,600
Alternative Revenue Programs (7,500) 55,100 37,100 60,900
Other Revenues 200 2,700 1,900 3,700
CL&P | Operating Segments | Residential        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 469,300 402,800 959,200 913,400
CL&P | Operating Segments | Commercial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 199,300 224,700 425,600 461,300
CL&P | Operating Segments | Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 33,300 33,800 67,300 68,400
CL&P | Operating Segments | Total Retail Tariff Sale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 701,900 661,300 1,452,100 1,443,100
CL&P | Operating Segments | Transmission Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 191,400 115,900 343,200 270,700
CL&P | Operating Segments | Wholesale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 39,300 12,100 104,000 25,800
CL&P | Operating Segments | Other Revenues from Contracts with Customers        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 8,100 9,100 17,000 18,000
CL&P | Operating Segments | Amortization/(Reserve) for Revenues Subject to Refund        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 0 0 0 0
CL&P | Eliminations        
Disaggregation of Revenue [Line Items]        
Operating Revenues (116,000) (115,400) (238,200) (232,100)
NSTAR Electric        
Disaggregation of Revenue [Line Items]        
Operating Revenues 660,971 681,893 1,394,804 1,479,505
Lease revenue 700 700 1,400 1,300
NSTAR Electric | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 764,100 777,800 1,583,600 1,665,100
Alternative Revenue Programs 3,600 2,100 23,000 9,300
Other Revenues 700 1,900 2,100 3,400
NSTAR Electric | Operating Segments | Residential        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 311,500 282,300 642,400 653,200
NSTAR Electric | Operating Segments | Commercial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 261,000 315,800 562,900 652,300
NSTAR Electric | Operating Segments | Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 24,800 28,900 51,600 57,800
NSTAR Electric | Operating Segments | Total Retail Tariff Sale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 597,300 627,000 1,256,900 1,363,300
NSTAR Electric | Operating Segments | Transmission Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 142,500 127,500 277,300 250,100
NSTAR Electric | Operating Segments | Wholesale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 13,200 17,200 27,600 41,600
NSTAR Electric | Operating Segments | Other Revenues from Contracts with Customers        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 11,100 6,100 21,800 10,100
NSTAR Electric | Operating Segments | Amortization/(Reserve) for Revenues Subject to Refund        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 0 0 0 0
NSTAR Electric | Eliminations        
Disaggregation of Revenue [Line Items]        
Operating Revenues (107,400) (99,900) (213,900) (198,300)
PSNH        
Disaggregation of Revenue [Line Items]        
Operating Revenues 255,224 240,900 531,592 517,335
PSNH | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 284,300 260,200 592,900 571,900
Alternative Revenue Programs 7,900 13,700 12,600 15,200
Other Revenues 0 500 600 800
PSNH | Operating Segments | Residential        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 135,200 119,900 278,100 271,700
PSNH | Operating Segments | Commercial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 66,100 72,700 145,300 152,600
PSNH | Operating Segments | Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 19,600 18,600 38,600 37,200
PSNH | Operating Segments | Total Retail Tariff Sale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 220,900 211,200 462,000 461,500
PSNH | Operating Segments | Transmission Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 49,500 37,800 99,200 85,300
PSNH | Operating Segments | Wholesale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 8,000 10,100 19,900 23,400
PSNH | Operating Segments | Other Revenues from Contracts with Customers        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 3,600 4,200 7,200 7,800
PSNH | Operating Segments | Amortization/(Reserve) for Revenues Subject to Refund        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 2,300 (3,100) 4,600 (6,100)
PSNH | Eliminations        
Disaggregation of Revenue [Line Items]        
Operating Revenues $ (37,000) $ (33,500) $ (74,500) $ (70,600)