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REVENUES (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers $ 1,868,200 $ 1,860,600 $ 4,265,600 $ 4,138,900
Alternative Revenue Programs 10,100 (11,900) 24,800 (5,400)
Other Revenues 6,200 5,200 9,900 8,300
Operating Revenues 1,884,495 1,853,856 4,300,287 4,141,818
Lease revenue 1,100   2,200  
Residential        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 938,800 930,800 2,257,900 2,201,300
Commercial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 697,400 705,700 1,506,900 1,466,000
Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 103,100 110,600 214,500 220,100
Total Retail Tariff Sale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 1,739,300 1,747,100 3,979,300 3,887,400
Transmission Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 56,100 55,400 123,700 120,500
Wholesale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 54,700 47,200 128,800 124,300
Other Revenues from Contracts with Customers        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 20,300 22,200 38,000 43,200
Reserve for Revenues Subject to Refund        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers (2,200) (11,300) (4,200) (36,500)
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 250,800 237,000 509,000 467,900
Alternative Revenue Programs 0 0 0 0
Other Revenues 0 0 0 0
Operating Revenues 250,800 237,000 509,000 467,900
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 14,700 12,600 28,300 22,700
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 236,100 224,400 480,700 445,200
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 (480,300) (497,500) (1,000,400) (980,100)
Alternative Revenue Programs (58,800) (2,900) (69,800) 7,700
Other Revenues 0 0 0 0
Operating Revenues (539,100) (500,400) (1,070,200) (972,400)
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 (900) (2,000) (2,000) (2,100)
Eliminations | Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers (2,800) (2,400) (5,500) (5,000)
Eliminations | Total Retail Tariff Sale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers (3,700) (4,400) (7,500) (7,100)
Eliminations | Transmission Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers (239,800) (268,000) (510,700) (526,700)
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 (236,800) (225,100) (482,200) (446,300)
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 1,550,500 1,550,100 3,379,400 3,293,500
Alternative Revenue Programs 6,300 (14,400) 8,400 (5,700)
Other Revenues 5,000 4,200 7,800 6,700
Operating Revenues 1,561,800 1,539,900 3,395,600 3,294,500
Electric Distribution | Operating Segments | Residential        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 805,000 794,400 1,838,300 1,788,700
Electric Distribution | Operating Segments | Commercial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 612,800 622,000 1,265,300 1,233,400
Electric Distribution | Operating Segments | Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 81,300 88,400 163,400 169,900
Electric Distribution | Operating Segments | Total Retail Tariff Sale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 1,499,100 1,504,800 3,267,000 3,192,000
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 39,400 34,200 90,800 92,700
Electric Distribution | Operating Segments | Other Revenues from Contracts with Customers        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 15,100 18,400 27,700 35,300
Electric Distribution | Operating Segments | Reserve for Revenues Subject to Refund        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers (3,100) (7,300) (6,100) (26,500)
Natural Gas Distribution | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 209,500 205,600 667,400 631,700
Alternative Revenue Programs (2,700) 100 7,700 (1,700)
Other Revenues 900 800 1,500 1,400
Operating Revenues 207,700 206,500 676,600 631,400
Natural Gas Distribution | Operating Segments | Residential        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 100,200 104,100 359,100 352,900
Natural Gas Distribution | Operating Segments | Commercial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 69,500 70,000 213,300 204,700
Natural Gas Distribution | Operating Segments | Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 23,500 23,500 54,400 53,100
Natural Gas Distribution | Operating Segments | Total Retail Tariff Sale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 193,200 197,600 626,800 610,700
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 14,400 12,100 36,100 29,900
Natural Gas Distribution | Operating Segments | Other Revenues from Contracts with Customers        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 400 (600) 1,400 (900)
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) 3,100 (8,000)
Electric Transmission | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 284,900 314,000 613,000 630,700
Alternative Revenue Programs 64,600 3,400 77,000 (8,300)
Other Revenues 100 0 100 0
Operating Revenues 349,600 317,400 690,100 622,400
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 281,200 310,800 606,100 624,500
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 3,700 3,200 6,900 6,200
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 52,800 51,400 97,200 95,200
Alternative Revenue Programs 700 1,900 1,500 2,600
Other Revenues 200 200 500 200
Operating Revenues 53,700 53,500 99,200 98,000
Water Distribution | Operating Segments | Residential        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 33,600 32,300 60,500 59,700
Water Distribution | Operating Segments | Commercial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 16,000 15,700 30,300 30,000
Water Distribution | Operating Segments | Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 1,100 1,100 2,200 2,100
Water Distribution | Operating Segments | Total Retail Tariff Sale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 50,700 49,100 93,000 91,800
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 1,900 1,700
Water Distribution | Operating Segments | Other Revenues from Contracts with Customers        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 1,800 1,900 3,500 3,700
Water Distribution | Operating Segments | Reserve for Revenues Subject to Refund        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers (600) (500) (1,200) (2,000)
CL&P        
Disaggregation of Revenue [Line Items]        
Operating Revenues 740,846 694,892 1,590,092 1,479,875
Lease revenue 300   500  
CL&P | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 798,400 798,900 1,757,600 1,697,100
Alternative Revenue Programs 55,100 1,000 60,900 (4,100)
Other Revenues 2,700 2,400 3,700 3,300
CL&P | Operating Segments | Residential        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 402,800 387,100 913,400 870,400
CL&P | Operating Segments | Commercial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 224,700 220,700 461,300 443,200
CL&P | Operating Segments | Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 33,800 36,500 68,400 72,300
CL&P | Operating Segments | Total Retail Tariff Sale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 661,300 644,300 1,443,100 1,385,900
CL&P | Operating Segments | Transmission Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 115,900 139,900 270,700 290,600
CL&P | Operating Segments | Wholesale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 12,100 10,600 25,800 21,000
CL&P | Operating Segments | Other Revenues from Contracts with Customers        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 9,100 8,300 18,000 16,200
CL&P | Operating Segments | Reserve for Revenues Subject to Refund        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 0 (4,200) 0 (16,600)
CL&P | Eliminations        
Disaggregation of Revenue [Line Items]        
Operating Revenues (115,400) (107,400) (232,100) (216,400)
NSTAR Electric        
Disaggregation of Revenue [Line Items]        
Operating Revenues 681,893 690,737 1,479,505 1,460,865
Lease revenue 700   1,300  
NSTAR Electric | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 777,800 792,500 1,665,100 1,648,000
Alternative Revenue Programs 2,100 (6,900) 9,300 (200)
Other Revenues 1,900 1,600 3,400 2,700
NSTAR Electric | Operating Segments | Residential        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 282,300 292,500 653,200 656,700
NSTAR Electric | Operating Segments | Commercial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 315,800 325,500 652,300 640,000
NSTAR Electric | Operating Segments | Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 28,900 30,900 57,800 59,000
NSTAR Electric | Operating Segments | Total Retail Tariff Sale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 627,000 648,900 1,363,300 1,355,700
NSTAR Electric | Operating Segments | Transmission Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 127,500 120,900 250,100 239,500
NSTAR Electric | Operating Segments | Wholesale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 17,200 13,400 41,600 38,200
NSTAR Electric | Operating Segments | Other Revenues from Contracts with Customers        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 6,100 9,300 10,100 18,300
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 (99,900) (96,500) (198,300) (189,600)
PSNH        
Disaggregation of Revenue [Line Items]        
Operating Revenues 240,900 235,146 517,335 502,497
PSNH | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 260,200 273,800 571,900 581,800
Alternative Revenue Programs 13,700 (5,000) 15,200 (9,600)
Other Revenues 500 200 800 600
PSNH | Operating Segments | Residential        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 119,900 114,800 271,700 261,600
PSNH | Operating Segments | Commercial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 72,700 76,200 152,600 151,100
PSNH | Operating Segments | Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 18,600 21,000 37,200 38,600
PSNH | Operating Segments | Total Retail Tariff Sale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 211,200 212,000 461,500 451,300
PSNH | Operating Segments | Transmission Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 37,800 50,100 85,300 94,300
PSNH | Operating Segments | Wholesale Revenue        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 10,100 10,900 23,400 34,900
PSNH | Operating Segments | Other Revenues from Contracts with Customers        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers 4,200 3,900 7,800 7,500
PSNH | Operating Segments | Reserve for Revenues Subject to Refund        
Disaggregation of Revenue [Line Items]        
Revenues from Contracts with Customers (3,100) (3,100) (6,100) (6,200)
PSNH | Eliminations        
Disaggregation of Revenue [Line Items]        
Operating Revenues $ (33,500) $ (33,900) $ (70,600) $ (70,300)