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REVENUES (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
May 06, 2021
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers $ 2,444,600 $ 2,352,100 $ 7,355,600 $ 6,593,800  
Alternative Revenue Programs (13,500) (9,600) 21,300 69,800  
Other Revenues 1,700 1,100 4,300 6,900  
Operating Revenues $ 2,432,794 $ 2,343,642 7,381,172 6,670,497  
Loss related to litigation settlement     103,583 0  
Operating Lease, Income, Comprehensive Income [Extensible Enumeration] Operating Revenues Operating Revenues      
Lease revenue $ 1,100 $ 1,100 3,800 3,200  
Unfavorable Regulatory Action          
Disaggregation of Revenue [Line Items]          
Loss related to litigation settlement     103,600    
Loss contingency, estimate of possible earnings impact, non-compliance with performance standards         $ 28,400
Sales | Unfavorable Regulatory Action          
Disaggregation of Revenue [Line Items]          
Loss related to litigation settlement     65,000    
CL&P          
Disaggregation of Revenue [Line Items]          
Operating Revenues $ 919,643 $ 994,270 2,736,513 2,711,394  
Loss related to litigation settlement     103,583 0  
Operating Lease, Income, Comprehensive Income [Extensible Enumeration] Operating Revenues Operating Revenues      
Lease revenue $ 200 $ 200 600 600  
NSTAR Electric          
Disaggregation of Revenue [Line Items]          
Operating Revenues $ 918,698 $ 875,371 2,343,116 2,270,174  
Operating Lease, Income, Comprehensive Income [Extensible Enumeration] Operating Revenues Operating Revenues      
Lease revenue $ 700 $ 700 2,500 2,100  
PSNH          
Disaggregation of Revenue [Line Items]          
Operating Revenues $ 314,893 $ 283,669 887,177 815,261  
Operating Lease, Income, Comprehensive Income [Extensible Enumeration] Operating Revenues Operating Revenues      
Residential          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers $ 1,267,600 $ 1,275,200 3,920,500 3,576,500  
Commercial          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 823,600 739,500 2,302,200 2,103,200  
Industrial          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 121,100 106,200 371,100 308,900  
Total Retail Tariff Sales Revenues          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 2,212,300 2,120,900 6,593,800 5,988,600  
Wholesale Transmission Revenues          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 141,700 111,600 325,500 252,100  
Wholesale Market Sales Revenues          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 147,100 89,400 437,200 265,900  
Other Revenues from Contracts with Customers          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 37,800 30,200 94,700 87,200  
(Reserve for)/Amortization of Revenues Subject to Refund          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers (94,300)   (95,600)    
Operating Segments | CL&P          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 1,143,600 1,192,800 3,204,400 3,109,100  
Alternative Revenue Programs (82,000) (65,000) (74,200) (27,800)  
Other Revenues 200 200 300 2,000  
Operating Segments | NSTAR Electric          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 1,055,700 980,000 2,713,900 2,563,800  
Alternative Revenue Programs (14,400) 8,200 (11,300) 31,100  
Other Revenues 700 700 2,500 2,800  
Operating Segments | PSNH          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 394,200 347,600 1,047,500 940,500  
Alternative Revenue Programs (24,100) (13,800) (18,800) (1,200)  
Other Revenues 600 0 1,100 600  
Operating Segments | Residential | CL&P          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 572,000 608,700 1,558,600 1,567,900  
Operating Segments | Residential | NSTAR Electric          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 401,900 415,400 1,069,000 1,057,900  
Operating Segments | Residential | PSNH          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 172,900 159,800 467,300 437,900  
Operating Segments | Commercial | CL&P          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 249,400 244,700 679,300 670,400  
Operating Segments | Commercial | NSTAR Electric          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 411,300 358,300 975,700 921,300  
Operating Segments | Commercial | PSNH          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 88,500 80,100 249,200 225,300  
Operating Segments | Industrial | CL&P          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 35,000 38,000 100,200 105,300  
Operating Segments | Industrial | NSTAR Electric          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 35,900 30,600 89,500 82,100  
Operating Segments | Industrial | PSNH          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 25,300 22,400 71,400 61,000  
Operating Segments | Total Retail Tariff Sales Revenues | CL&P          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 856,400 891,400 2,338,100 2,343,600  
Operating Segments | Total Retail Tariff Sales Revenues | NSTAR Electric          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 849,100 804,300 2,134,200 2,061,300  
Operating Segments | Total Retail Tariff Sales Revenues | PSNH          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 286,700 262,300 787,900 724,200  
Operating Segments | Wholesale Transmission Revenues | CL&P          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 268,200 233,300 652,800 576,500  
Operating Segments | Wholesale Transmission Revenues | NSTAR Electric          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 171,000 153,100 478,200 430,300  
Operating Segments | Wholesale Transmission Revenues | PSNH          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 88,000 71,800 207,400 171,100  
Operating Segments | Wholesale Market Sales Revenues | CL&P          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 100,300 60,000 278,100 163,900  
Operating Segments | Wholesale Market Sales Revenues | NSTAR Electric          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 21,300 12,100 64,700 39,800  
Operating Segments | Wholesale Market Sales Revenues | PSNH          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 12,200 7,500 37,300 27,400  
Operating Segments | Other Revenues from Contracts with Customers | CL&P          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 12,100 8,100 28,800 25,100  
Operating Segments | Other Revenues from Contracts with Customers | NSTAR Electric          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 14,300 10,500 36,800 32,400  
Operating Segments | Other Revenues from Contracts with Customers | PSNH          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 7,300 3,700 14,900 10,900  
Operating Segments | (Reserve for)/Amortization of Revenues Subject to Refund | CL&P          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers (93,400) 0 (93,400) 0  
Operating Segments | (Reserve for)/Amortization of Revenues Subject to Refund | NSTAR Electric          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 0 0 0 0  
Operating Segments | (Reserve for)/Amortization of Revenues Subject to Refund | PSNH          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 0 2,300 0 6,900  
Other          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 326,100 322,300 999,100 900,700  
Alternative Revenue Programs 0 0 0 0  
Other Revenues 0 0 0 0  
Operating Revenues 326,100 322,300 999,100 900,700  
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 Sales Revenues          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 0 0 0 0  
Other | Wholesale Transmission Revenues          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 23,000 19,000 62,500 55,600  
Other | Wholesale Market Sales Revenues          
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 303,100 303,300 936,600 845,100  
Other | (Reserve for)/Amortization of Revenues Subject to Refund          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 0   0    
Eliminations          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers (716,100) (669,600) (2,021,900) (1,833,200)  
Alternative Revenue Programs 102,000 67,000 103,000 48,900  
Other Revenues 0 0 0 0  
Operating Revenues (614,100) (602,600) (1,918,900) (1,784,300)  
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) (4,100) (3,700)  
Eliminations | Industrial          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers (4,800) (3,600) (12,800) (10,100)  
Eliminations | Total Retail Tariff Sales Revenues          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers (6,200) (5,000) (16,900) (13,800)  
Eliminations | Wholesale Transmission Revenues          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers (408,500) (365,600) (1,075,400) (981,400)  
Eliminations | Wholesale Market Sales Revenues          
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 (301,400) (299,000) (929,600) (838,000)  
Eliminations | (Reserve for)/Amortization of Revenues Subject to Refund          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 0   0    
Eliminations | CL&P          
Disaggregation of Revenue [Line Items]          
Operating Revenues (142,200) (133,700) (394,000) (371,900)  
Eliminations | NSTAR Electric          
Disaggregation of Revenue [Line Items]          
Operating Revenues (123,300) (113,500) (362,000) (327,500)  
Eliminations | PSNH          
Disaggregation of Revenue [Line Items]          
Operating Revenues (55,800) (50,100) (142,600) (124,600)  
Electric Distribution | Operating Segments          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 2,061,800 2,057,900 5,614,000 5,422,200  
Alternative Revenue Programs (7,900) 1,700 14,900 54,800  
Other Revenues 1,300 700 3,200 4,900  
Operating Revenues 2,055,200 2,060,300 5,632,100 5,481,900  
Electric Distribution | Operating Segments | Residential          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 1,146,800 1,183,900 3,094,900 3,063,700  
Electric Distribution | Operating Segments | Commercial          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 748,800 682,700 1,902,900 1,815,700  
Electric Distribution | Operating Segments | Industrial          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 96,200 91,000 261,100 248,400  
Electric Distribution | Operating Segments | Total Retail Tariff Sales Revenues          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 1,991,800 1,957,600 5,258,900 5,127,800  
Electric Distribution | Operating Segments | Wholesale Transmission Revenues          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 0 0 0 0  
Electric Distribution | Operating Segments | Wholesale Market Sales Revenues          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 133,800 79,600 380,100 231,100  
Electric Distribution | Operating Segments | Other Revenues from Contracts with Customers          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 29,600 20,700 68,400 63,300  
Electric Distribution | Operating Segments | (Reserve for)/Amortization of Revenues Subject to Refund          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers (93,400)   (93,400)    
Natural Gas Distribution | Operating Segments          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 182,700 114,100 1,256,400 746,100  
Alternative Revenue Programs 2,700 (4,000) 21,300 22,900  
Other Revenues 100 100 100 1,000  
Operating Revenues 185,500 110,200 1,277,800 770,000  
Natural Gas Distribution | Operating Segments | Residential          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 81,700 45,500 722,800 399,600  
Natural Gas Distribution | Operating Segments | Commercial          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 59,000 41,100 356,400 243,500  
Natural Gas Distribution | Operating Segments | Industrial          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 28,600 17,500 119,500 67,000  
Natural Gas Distribution | Operating Segments | Total Retail Tariff Sales Revenues          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 169,300 104,100 1,198,700 710,100  
Natural Gas Distribution | Operating Segments | Wholesale Transmission Revenues          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 0 0 0 0  
Natural Gas Distribution | Operating Segments | Wholesale Market Sales Revenues          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 12,200 8,700 54,100 31,900  
Natural Gas Distribution | Operating Segments | Other Revenues from Contracts with Customers          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 1,200 1,300 3,600 4,100  
Natural Gas Distribution | Operating Segments | (Reserve for)/Amortization of Revenues Subject to Refund          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 0   0    
Electric Transmission | Operating Segments          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 530,700 461,400 1,348,600 1,187,800  
Alternative Revenue Programs (112,600) (72,300) (119,200) (52,700)  
Other Revenues 200 200 700 500  
Operating Revenues 418,300 389,300 1,230,100 1,135,600  
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 Sales Revenues          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 0 0 0 0  
Electric Transmission | Operating Segments | Wholesale Transmission Revenues          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 527,200 458,200 1,338,400 1,177,900  
Electric Transmission | Operating Segments | Wholesale Market Sales Revenues          
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 3,500 3,200 10,200 9,900  
Electric Transmission | Operating Segments | (Reserve for)/Amortization of Revenues Subject to Refund          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 0   0    
Water Distribution | Operating Segments          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 59,400 66,000 159,400 170,200  
Alternative Revenue Programs 2,300 (2,000) 1,300 (4,100)  
Other Revenues 100 100 300 500  
Operating Revenues 61,800 64,100 161,000 166,600  
Water Distribution | Operating Segments | Residential          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 39,100 45,800 102,800 113,200  
Water Distribution | Operating Segments | Commercial          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 17,200 17,100 47,000 47,700  
Water Distribution | Operating Segments | Industrial          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 1,100 1,300 3,300 3,600  
Water Distribution | Operating Segments | Total Retail Tariff Sales Revenues          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 57,400 64,200 153,100 164,500  
Water Distribution | Operating Segments | Wholesale Transmission Revenues          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 0 0 0 0  
Water Distribution | Operating Segments | Wholesale Market Sales Revenues          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 1,100 1,100 3,000 2,900  
Water Distribution | Operating Segments | Other Revenues from Contracts with Customers          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 1,800 $ 700 5,500 $ 2,800  
Water Distribution | Operating Segments | (Reserve for)/Amortization of Revenues Subject to Refund          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers $ (900)   $ (2,200)