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REVENUES (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers $ 2,168,400 $ 2,321,100 $ 6,434,100 $ 6,458,900
Alternative Revenue Programs (200) (55,200) 24,500 (60,500)
Other Revenues 7,600 5,500 17,500 14,800
Operating Revenues 2,175,797 2,271,425 6,476,084 6,413,243
Lease revenue 1,200   3,400  
Residential        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 1,124,400 1,195,700 3,382,300 3,397,200
Commercial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 794,600 847,100 2,301,600 2,312,900
Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 106,800 116,300 321,300 336,400
Total Retail Tariff Sale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 2,025,800 2,159,100 6,005,200 6,046,500
Transmission Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 80,200 76,000 203,900 196,400
Wholesale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 39,900 61,500 168,700 185,900
Other Revenues from Contracts with Customers        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 17,300 24,100 55,200 66,100
Reserve for Revenues Subject to Refund        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 5,200 400 1,100 (36,000)
Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers      
Operating Revenues      
Operating Segments | Total Retail Tariff Sale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers      
Other        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 258,100 224,600 767,100 692,500
Alternative Revenue Programs 0 0 0 0
Other Revenues 0 0 0 0
Operating Revenues 258,100 224,600 767,100 692,500
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 15,400 11,700 43,700 34,400
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 242,700 212,900 723,400 658,100
Other | 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 (548,300) (517,500) (1,548,700) (1,497,600)
Alternative Revenue Programs 19,000 33,800 (50,800) 41,500
Other Revenues 0 0 0 0
Operating Revenues (529,300) (483,700) (1,599,500) (1,456,100)
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) (1,200) (3,400) (3,400)
Eliminations | Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers (3,200) (2,600) (8,700) (7,500)
Eliminations | Total Retail Tariff Sale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers (4,600) (3,800) (12,100) (10,900)
Eliminations | Transmission Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers (300,700) (300,200) (811,400) (826,900)
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 (243,000) (213,500) (725,200) (659,800)
Eliminations | 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 1,918,500 2,074,200 5,298,000 5,366,600
Alternative Revenue Programs 6,700 (51,600) 15,000 (57,200)
Other Revenues 6,400 4,800 14,200 12,400
Operating Revenues 1,931,600 2,027,400 5,327,200 5,321,800
Electric Distribution | Operating Segments | Residential        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 1,041,400 1,111,700 2,879,800 2,900,400
Electric Distribution | Operating Segments | Commercial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 736,600 789,600 2,002,000 2,023,000
Electric Distribution | Operating Segments | Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 90,600 98,700 254,000 268,600
Electric Distribution | Operating Segments | Total Retail Tariff Sale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 1,868,600 2,000,000 5,135,800 5,192,000
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 33,100 48,800 123,900 141,400
Electric Distribution | Operating Segments | Other Revenues from Contracts with Customers        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 12,300 20,200 40,000 54,400
Electric Distribution | Operating Segments | Reserve for Revenues Subject to Refund        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 4,500 5,200 (1,700) (21,200)
Natural Gas Distribution | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 110,200 109,900 777,600 741,700
Alternative Revenue Programs (7,600) (1,500) 0 (3,200)
Other Revenues 800 600 2,300 2,000
Operating Revenues 103,400 109,000 779,900 740,500
Natural Gas Distribution | Operating Segments | Residential        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 43,000 42,800 402,000 395,900
Natural Gas Distribution | Operating Segments | Commercial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 41,600 40,800 254,900 245,400
Natural Gas Distribution | Operating Segments | Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 18,100 18,900 72,500 71,900
Natural Gas Distribution | Operating Segments | Total Retail Tariff Sale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 102,700 102,500 729,400 713,200
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 5,500 11,400 41,600 41,400
Natural Gas Distribution | Operating Segments | Other Revenues from Contracts with Customers        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 500 (500) 1,900 (1,400)
Natural Gas Distribution | Operating Segments | Reserve for Revenues Subject to Refund        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 1,500 (3,500) 4,700 (11,500)
Electric Transmission | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 368,600 367,600 981,500 998,300
Alternative Revenue Programs (20,900) (37,000) 56,100 (45,300)
Other Revenues 100 0 300 0
Operating Revenues 347,800 330,600 1,037,900 953,000
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 365,500 364,500 971,600 988,900
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 3,100 3,100 9,900 9,400
Electric Transmission | Operating Segments | 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 61,300 62,300 158,600 157,400
Alternative Revenue Programs 2,600 1,100 4,200 3,700
Other Revenues 300 100 700 400
Operating Revenues 64,200 63,500 163,500 161,500
Water Distribution | Operating Segments | Residential        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 40,000 41,200 100,500 100,900
Water Distribution | Operating Segments | Commercial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 17,800 17,900 48,100 47,900
Water Distribution | Operating Segments | Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 1,300 1,300 3,500 3,400
Water Distribution | Operating Segments | Total Retail Tariff Sale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 59,100 60,400 152,100 152,200
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 1,300 1,300 3,200 3,100
Water Distribution | Operating Segments | Other Revenues from Contracts with Customers        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 1,700 1,900 5,200 5,400
Water Distribution | Operating Segments | Reserve for Revenues Subject to Refund        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers (800) (1,300) (1,900) (3,300)
CL&P        
Disaggregation of Revenue [Line Items]        
Operating Revenues 853,943 865,028 2,444,034 2,344,903
Lease revenue 300   700  
CL&P | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 996,000 1,048,000 2,753,600 2,744,800
Alternative Revenue Programs (15,200) (64,300) 45,600 (68,400)
Other Revenues 4,100 2,800 7,900 6,500
CL&P | Operating Segments | Residential        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 513,600 539,600 1,426,900 1,410,000
CL&P | Operating Segments | Commercial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 247,000 259,000 708,400 702,200
CL&P | Operating Segments | Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 37,400 39,400 105,800 111,800
CL&P | Operating Segments | Total Retail Tariff Sale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 798,000 838,000 2,241,100 2,224,000
CL&P | Operating Segments | Transmission Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 175,200 179,100 445,900 469,800
CL&P | Operating Segments | Wholesale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 13,800 13,300 39,600 34,300
CL&P | Operating Segments | Other Revenues from Contracts with Customers        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 9,000 9,300 27,000 25,000
CL&P | Operating Segments | Reserve for Revenues Subject to Refund        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 0 8,300 0 (8,300)
CL&P | Eliminations        
Disaggregation of Revenue [Line Items]        
Operating Revenues (131,000) (121,500) (363,100) (338,000)
NSTAR Electric        
Disaggregation of Revenue [Line Items]        
Operating Revenues 878,669 939,460 2,358,174 2,400,324
Lease revenue 700   2,000  
NSTAR Electric | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 963,300 1,053,300 2,628,400 2,700,600
Alternative Revenue Programs 9,800 (15,400) 19,100 (15,600)
Other Revenues 1,800 1,800 5,200 5,100
NSTAR Electric | Operating Segments | Residential        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 374,400 414,800 1,027,800 1,071,600
NSTAR Electric | Operating Segments | Commercial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 406,100 443,800 1,058,300 1,083,800
NSTAR Electric | Operating Segments | Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 32,400 38,000 90,100 96,900
NSTAR Electric | Operating Segments | Total Retail Tariff Sale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 812,900 896,600 2,176,200 2,252,300
NSTAR Electric | Operating Segments | Transmission Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 132,900 128,300 383,100 367,700
NSTAR Electric | Operating Segments | Wholesale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 14,400 18,100 55,900 56,400
NSTAR Electric | Operating Segments | Other Revenues from Contracts with Customers        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 3,100 10,300 13,200 27,900
NSTAR Electric | Operating Segments | Reserve for Revenues Subject to Refund        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 0 0 0 (3,700)
NSTAR Electric | Eliminations        
Disaggregation of Revenue [Line Items]        
Operating Revenues (96,200) (100,200) (294,500) (289,800)
PSNH        
Disaggregation of Revenue [Line Items]        
Operating Revenues 280,431 290,203 797,766 792,700
PSNH | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 329,100 341,300 901,100 923,000
Alternative Revenue Programs (8,800) (8,900) 6,400 (18,500)
Other Revenues 600 200 1,400 800
PSNH | Operating Segments | Residential        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 153,400 157,300 425,100 418,800
PSNH | Operating Segments | Commercial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 84,100 87,300 236,800 238,400
PSNH | Operating Segments | Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 20,800 21,300 58,100 59,900
PSNH | Operating Segments | Total Retail Tariff Sale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 258,300 265,900 720,000 717,100
PSNH | Operating Segments | Transmission Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 57,400 57,100 142,600 151,400
PSNH | Operating Segments | Wholesale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 4,900 17,400 28,400 52,300
PSNH | Operating Segments | Other Revenues from Contracts with Customers        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 4,000 4,000 11,800 11,400
PSNH | Operating Segments | Reserve for Revenues Subject to Refund        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 4,500 (3,100) (1,700) (9,200)
PSNH | Eliminations        
Disaggregation of Revenue [Line Items]        
Operating Revenues $ (40,500) $ (42,400) $ (111,100) $ (112,600)