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REVENUES (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers $ 2,352,100 $ 2,168,400 $ 6,593,800 $ 6,434,100
Alternative Revenue Programs (9,600) (200) 69,800 24,500
Other Revenues 1,100 7,600 6,900 17,500
Operating Revenues 2,343,642 2,175,797 6,670,497 6,476,084
Lease revenue $ 1,100 $ 1,200 $ 3,200 $ 3,400
Operating Lease, Income, Comprehensive Income [Extensible List] us-gaap:Revenues us-gaap:Revenues us-gaap:Revenues us-gaap:Revenues
Residential        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers $ 1,275,200 $ 1,124,400 $ 3,576,500 $ 3,382,300
Commercial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 739,500 794,600 2,103,200 2,301,600
Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 106,200 106,800 308,900 321,300
Total Retail Tariff Sale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 2,120,900 2,025,800 5,988,600 6,005,200
Transmission Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 111,600 80,200 252,100 203,900
Wholesale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 89,400 39,900 265,900 168,700
Other Revenues from Contracts with Customers        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 28,500 17,300 81,500 55,200
Amortization of/(Reserve for) Revenues Subject to Refund        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 1,700 5,200 5,700 1,100
Other        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 322,300 258,100 900,700 767,100
Alternative Revenue Programs 0 0 0 0
Other Revenues 0 0 0 0
Operating Revenues 322,300 258,100 900,700 767,100
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 19,000 15,400 55,600 43,700
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 303,300 242,700 845,100 723,400
Other | Amortization of/(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 (669,600) (548,300) (1,833,200) (1,548,700)
Alternative Revenue Programs 67,000 19,000 48,900 (50,800)
Other Revenues 0 0 0 0
Operating Revenues (602,600) (529,300) (1,784,300) (1,599,500)
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 (1,400) (1,400) (3,700) (3,400)
Eliminations | Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers (3,600) (3,200) (10,100) (8,700)
Eliminations | Total Retail Tariff Sale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers (5,000) (4,600) (13,800) (12,100)
Eliminations | Transmission Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers (365,600) (300,700) (981,400) (811,400)
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 (299,000) (243,000) (838,000) (725,200)
Eliminations | Amortization of/(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 2,057,900 1,918,500 5,422,200 5,298,000
Alternative Revenue Programs 1,700 6,700 54,800 15,000
Other Revenues 700 6,400 4,900 14,200
Operating Revenues 2,060,300 1,931,600 5,481,900 5,327,200
Electric Distribution | Operating Segments | Residential        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 1,183,900 1,041,400 3,063,700 2,879,800
Electric Distribution | Operating Segments | Commercial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 682,700 736,600 1,815,700 2,002,000
Electric Distribution | Operating Segments | Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 91,000 90,600 248,400 254,000
Electric Distribution | Operating Segments | Total Retail Tariff Sale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 1,957,600 1,868,600 5,127,800 5,135,800
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 79,600 33,100 231,100 123,900
Electric Distribution | Operating Segments | Other Revenues from Contracts with Customers        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 18,400 12,300 56,400 40,000
Electric Distribution | Operating Segments | Amortization of/(Reserve for) Revenues Subject to Refund        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 2,300 4,500 6,900 (1,700)
Natural Gas Distribution | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 114,100 110,200 746,100 777,600
Alternative Revenue Programs (4,000) (7,600) 22,900 0
Other Revenues 100 800 1,000 2,300
Operating Revenues 110,200 103,400 770,000 779,900
Natural Gas Distribution | Operating Segments | Residential        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 45,500 43,000 399,600 402,000
Natural Gas Distribution | Operating Segments | Commercial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 41,100 41,600 243,500 254,900
Natural Gas Distribution | Operating Segments | Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 17,500 18,100 67,000 72,500
Natural Gas Distribution | Operating Segments | Total Retail Tariff Sale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 104,100 102,700 710,100 729,400
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 8,700 5,500 31,900 41,600
Natural Gas Distribution | Operating Segments | Other Revenues from Contracts with Customers        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 800 500 2,500 1,900
Natural Gas Distribution | Operating Segments | Amortization of/(Reserve for) Revenues Subject to Refund        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 500 1,500 1,600 4,700
Electric Transmission | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 461,400 368,600 1,187,800 981,500
Alternative Revenue Programs (72,300) (20,900) (52,700) 56,100
Other Revenues 200 100 500 300
Operating Revenues 389,300 347,800 1,135,600 1,037,900
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 458,200 365,500 1,177,900 971,600
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 3,200 3,100 9,900 9,900
Electric Transmission | Operating Segments | Amortization of/(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 66,000 61,300 170,200 158,600
Alternative Revenue Programs (2,000) 2,600 (4,100) 4,200
Other Revenues 100 300 500 700
Operating Revenues 64,100 64,200 166,600 163,500
Water Distribution | Operating Segments | Residential        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 45,800 40,000 113,200 100,500
Water Distribution | Operating Segments | Commercial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 17,100 17,800 47,700 48,100
Water Distribution | Operating Segments | Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 1,300 1,300 3,600 3,500
Water Distribution | Operating Segments | Total Retail Tariff Sale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 64,200 59,100 164,500 152,100
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 1,100 1,300 2,900 3,200
Water Distribution | Operating Segments | Other Revenues from Contracts with Customers        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 1,800 1,700 5,600 5,200
Water Distribution | Operating Segments | Amortization of/(Reserve for) Revenues Subject to Refund        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers (1,100) (800) (2,800) (1,900)
CL&P        
Disaggregation of Revenue [Line Items]        
Operating Revenues 994,270 853,943 2,711,394 2,444,034
Lease revenue 200 300 600 700
CL&P | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 1,192,800 996,000 3,109,100 2,753,600
Alternative Revenue Programs (65,000) (15,200) (27,800) 45,600
Other Revenues 200 4,100 2,000 7,900
CL&P | Operating Segments | Residential        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 608,700 513,600 1,567,900 1,426,900
CL&P | Operating Segments | Commercial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 244,700 247,000 670,400 708,400
CL&P | Operating Segments | Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 38,000 37,400 105,300 105,800
CL&P | Operating Segments | Total Retail Tariff Sale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 891,400 798,000 2,343,600 2,241,100
CL&P | Operating Segments | Transmission Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 233,300 175,200 576,500 445,900
CL&P | Operating Segments | Wholesale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 60,000 13,800 163,900 39,600
CL&P | Operating Segments | Other Revenues from Contracts with Customers        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 8,100 9,000 25,100 27,000
CL&P | Operating Segments | Amortization of/(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 (133,700) (131,000) (371,900) (363,100)
NSTAR Electric        
Disaggregation of Revenue [Line Items]        
Operating Revenues 875,371 878,669 2,270,174 2,358,174
Lease revenue 700 700 2,100 2,000
NSTAR Electric | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 980,000 963,300 2,563,800 2,628,400
Alternative Revenue Programs 8,200 9,800 31,100 19,100
Other Revenues 700 1,800 2,800 5,200
NSTAR Electric | Operating Segments | Residential        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 415,400 374,400 1,057,900 1,027,800
NSTAR Electric | Operating Segments | Commercial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 358,300 406,100 921,300 1,058,300
NSTAR Electric | Operating Segments | Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 30,600 32,400 82,100 90,100
NSTAR Electric | Operating Segments | Total Retail Tariff Sale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 804,300 812,900 2,061,300 2,176,200
NSTAR Electric | Operating Segments | Transmission Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 153,100 132,900 430,300 383,100
NSTAR Electric | Operating Segments | Wholesale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 12,100 14,400 39,800 55,900
NSTAR Electric | Operating Segments | Other Revenues from Contracts with Customers        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 10,500 3,100 32,400 13,200
NSTAR Electric | Operating Segments | Amortization of/(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 (113,500) (96,200) (327,500) (294,500)
PSNH        
Disaggregation of Revenue [Line Items]        
Operating Revenues 283,669 280,431 815,261 797,766
PSNH | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 347,600 329,100 940,500 901,100
Alternative Revenue Programs (13,800) (8,800) (1,200) 6,400
Other Revenues 0 600 600 1,400
PSNH | Operating Segments | Residential        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 159,800 153,400 437,900 425,100
PSNH | Operating Segments | Commercial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 80,100 84,100 225,300 236,800
PSNH | Operating Segments | Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 22,400 20,800 61,000 58,100
PSNH | Operating Segments | Total Retail Tariff Sale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 262,300 258,300 724,200 720,000
PSNH | Operating Segments | Transmission Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 71,800 57,400 171,100 142,600
PSNH | Operating Segments | Wholesale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 7,500 4,900 27,400 28,400
PSNH | Operating Segments | Other Revenues from Contracts with Customers        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 3,700 4,000 10,900 11,800
PSNH | Operating Segments | Amortization of/(Reserve for) Revenues Subject to Refund        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 2,300 4,500 6,900 (1,700)
PSNH | Eliminations        
Disaggregation of Revenue [Line Items]        
Operating Revenues $ (50,100) $ (40,500) $ (124,600) $ (111,100)