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REVENUES (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Sep. 01, 2021
May 06, 2021
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers $ 3,452,000 $ 2,771,700      
Alternative Revenue Programs 15,800 52,500      
Other Revenues 3,500 1,600      
Operating Revenues 3,471,310 2,825,840      
(Customer Credits)/Reserve at CL&P related to PURA Settlement Agreement and Storm Performance Penalty $ (58,412) $ 30,000      
Operating Lease, Income, Comprehensive Income [Extensible Enumeration] Operating Revenues Operating Revenues      
Lease revenue $ 1,000 $ 1,600      
Unfavorable Regulatory Action          
Disaggregation of Revenue [Line Items]          
Loss contingency, estimate of possible earnings impact, non-compliance with performance standards         $ 28,400
CL&P          
Disaggregation of Revenue [Line Items]          
Operating Revenues 1,285,831 987,274      
(Customer Credits)/Reserve at CL&P related to PURA Settlement Agreement and Storm Performance Penalty $ (58,412) $ 30,000      
Operating Lease, Income, Comprehensive Income [Extensible Enumeration] Operating Revenues Operating Revenues      
Lease revenue $ 200 $ 200      
CL&P | Unfavorable Regulatory Action          
Disaggregation of Revenue [Line Items]          
Loss contingency, estimate of possible earnings impact, non-compliance with performance standards       $ 28,400  
CL&P | Unfavorable Regulatory Action | Sales          
Disaggregation of Revenue [Line Items]          
(Customer Credits)/Reserve at CL&P related to PURA Settlement Agreement and Storm Performance Penalty 65,000        
NSTAR Electric          
Disaggregation of Revenue [Line Items]          
Operating Revenues $ 863,176 $ 737,043      
Operating Lease, Income, Comprehensive Income [Extensible Enumeration] Operating Revenues Operating Revenues      
Lease revenue $ 600 $ 1,100      
PSNH          
Disaggregation of Revenue [Line Items]          
Operating Revenues $ 339,427 $ 293,435      
Operating Lease, Income, Comprehensive Income [Extensible Enumeration] Operating Revenues Operating Revenues      
Total Retail Tariff Sales Revenues          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers $ 2,857,900 $ 2,476,300      
Residential          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 1,771,200 1,560,000      
Commercial          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 932,400 779,900      
Industrial          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 154,300 136,400      
Wholesale Transmission Revenues          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 105,900 92,500      
Wholesale Market Sales Revenues          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 399,800 176,300      
Other Revenues from Contracts with Customers          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 30,400 26,600      
(Reserve for)/Amortization of Revenues Subject to Refund          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 58,000        
Operating Segments | CL&P          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 1,430,100 1,102,700      
Alternative Revenue Programs 1,300 8,900      
Other Revenues 100 200      
Operating Segments | NSTAR Electric          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 1,004,700 838,500      
Alternative Revenue Programs (8,200) 13,800      
Other Revenues 2,000 1,100      
Operating Segments | PSNH          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 395,100 333,700      
Alternative Revenue Programs (3,300) 3,000      
Other Revenues 900 0      
Operating Segments | Total Retail Tariff Sales Revenues | CL&P          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 874,800 796,700      
Operating Segments | Total Retail Tariff Sales Revenues | NSTAR Electric          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 770,000 655,300      
Operating Segments | Total Retail Tariff Sales Revenues | PSNH          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 292,900 257,300      
Operating Segments | Residential | CL&P          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 599,100 545,800      
Operating Segments | Residential | NSTAR Electric          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 404,600 362,400      
Operating Segments | Residential | PSNH          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 182,500 157,800      
Operating Segments | Commercial | CL&P          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 242,200 214,200      
Operating Segments | Commercial | NSTAR Electric          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 331,300 268,300      
Operating Segments | Commercial | PSNH          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 88,400 77,800      
Operating Segments | Industrial | CL&P          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 33,500 36,700      
Operating Segments | Industrial | NSTAR Electric          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 34,100 24,600      
Operating Segments | Industrial | PSNH          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 22,000 21,700      
Operating Segments | Wholesale Transmission Revenues | CL&P          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 209,100 189,000      
Operating Segments | Wholesale Transmission Revenues | NSTAR Electric          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 165,200 147,100      
Operating Segments | Wholesale Transmission Revenues | PSNH          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 71,900 58,200      
Operating Segments | Wholesale Market Sales Revenues | CL&P          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 279,900 109,700      
Operating Segments | Wholesale Market Sales Revenues | NSTAR Electric          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 57,900 24,400      
Operating Segments | Wholesale Market Sales Revenues | PSNH          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 27,700 15,000      
Operating Segments | Other Revenues from Contracts with Customers | CL&P          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 7,900 7,300      
Operating Segments | Other Revenues from Contracts with Customers | NSTAR Electric          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 11,600 11,700      
Operating Segments | Other Revenues from Contracts with Customers | PSNH          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 2,600 3,200      
Operating Segments | (Reserve for)/Amortization of Revenues Subject to Refund | CL&P          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 58,400 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      
Operating Segments | (Reserve for)/Amortization of Revenues Subject to Refund | PSNH          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 0 0      
Operating Segments | Reserves For Revenues Subject To Refund | CL&P | Unfavorable Regulatory Action          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers     $ 93,400    
Other          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 383,500 343,000      
Alternative Revenue Programs 0 0      
Other Revenues 0 0      
Operating Revenues 383,500 343,000      
Other | Total Retail Tariff Sales Revenues          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 0 0      
Other | Residential          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 0 0      
Other | Commercial          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 0 0      
Other | Industrial          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 0 0      
Other | Wholesale Transmission Revenues          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 24,400 19,200      
Other | Wholesale Market Sales Revenues          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 0 0      
Other | Other Revenues from Contracts with Customers          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 359,100 323,800      
Other | (Reserve for)/Amortization of Revenues Subject to Refund          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 0        
Eliminations          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers (723,400) (647,200)      
Alternative Revenue Programs 13,600 2,200      
Other Revenues 0 0      
Operating Revenues (709,800) (645,000)      
Eliminations | Total Retail Tariff Sales Revenues          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers (5,600) (4,900)      
Eliminations | Residential          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 0 0      
Eliminations | Commercial          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers (1,100) (1,400)      
Eliminations | Industrial          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers (4,500) (3,500)      
Eliminations | Wholesale Transmission Revenues          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers (364,700) (321,000)      
Eliminations | Wholesale Market Sales Revenues          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 0 0      
Eliminations | Other Revenues from Contracts with Customers          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers (353,100) (321,300)      
Eliminations | (Reserve for)/Amortization of Revenues Subject to Refund          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 0        
Eliminations | CL&P          
Disaggregation of Revenue [Line Items]          
Operating Revenues (145,700) (124,500)      
Eliminations | NSTAR Electric          
Disaggregation of Revenue [Line Items]          
Operating Revenues (135,300) (116,400)      
Eliminations | PSNH          
Disaggregation of Revenue [Line Items]          
Operating Revenues (53,300) (43,300)      
Electric Distribution | Operating Segments          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 2,378,700 1,876,200      
Alternative Revenue Programs 4,800 23,000      
Other Revenues 2,800 1,100      
Operating Revenues 2,386,300 1,900,300      
Electric Distribution | Operating Segments | Total Retail Tariff Sales Revenues          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 1,937,100 1,708,900      
Electric Distribution | Operating Segments | Residential          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 1,186,200 1,066,000      
Electric Distribution | Operating Segments | Commercial          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 661,300 559,900      
Electric Distribution | Operating Segments | Industrial          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 89,600 83,000      
Electric Distribution | Operating Segments | Wholesale Transmission Revenues          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 0 0      
Electric Distribution | Operating Segments | Wholesale Market Sales Revenues          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 365,500 149,100      
Electric Distribution | Operating Segments | Other Revenues from Contracts with Customers          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 17,700 18,200      
Electric Distribution | Operating Segments | (Reserve for)/Amortization of Revenues Subject to Refund          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 58,400        
Natural Gas Distribution | Operating Segments          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 917,000 757,500      
Alternative Revenue Programs 10,200 22,800      
Other Revenues 400 200      
Operating Revenues 927,600 780,500      
Natural Gas Distribution | Operating Segments | Total Retail Tariff Sales Revenues          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 882,500 729,800      
Natural Gas Distribution | Operating Segments | Residential          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 556,800 466,300      
Natural Gas Distribution | Operating Segments | Commercial          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 257,600 207,600      
Natural Gas Distribution | Operating Segments | Industrial          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 68,100 55,900      
Natural Gas Distribution | Operating Segments | Wholesale Transmission Revenues          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 0 0      
Natural Gas Distribution | Operating Segments | Wholesale Market Sales Revenues          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 33,500 26,400      
Natural Gas Distribution | Operating Segments | Other Revenues from Contracts with Customers          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 1,000 1,300      
Natural Gas Distribution | Operating Segments | (Reserve for)/Amortization of Revenues Subject to Refund          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 0        
Electric Transmission | Operating Segments          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 450,000 397,700      
Alternative Revenue Programs (15,000) 2,700      
Other Revenues 200 200      
Operating Revenues 435,200 400,600      
Electric Transmission | Operating Segments | Total Retail Tariff Sales Revenues          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 0 0      
Electric Transmission | Operating Segments | Residential          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 0 0      
Electric Transmission | Operating Segments | Commercial          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 0 0      
Electric Transmission | Operating Segments | Industrial          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 0 0      
Electric Transmission | Operating Segments | Wholesale Transmission Revenues          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 446,200 394,300      
Electric Transmission | Operating Segments | Wholesale Market Sales Revenues          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 0 0      
Electric Transmission | Operating Segments | Other Revenues from Contracts with Customers          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 3,800 3,400      
Electric Transmission | Operating Segments | (Reserve for)/Amortization of Revenues Subject to Refund          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 0        
Water Distribution | Operating Segments          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 46,200 44,500      
Alternative Revenue Programs 2,200 1,800      
Other Revenues 100 100      
Operating Revenues 48,500 46,400      
Water Distribution | Operating Segments | Total Retail Tariff Sales Revenues          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 43,900 42,500      
Water Distribution | Operating Segments | Residential          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 28,200 27,700      
Water Distribution | Operating Segments | Commercial          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 14,600 13,800      
Water Distribution | Operating Segments | Industrial          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 1,100 1,000      
Water Distribution | Operating Segments | Wholesale Transmission Revenues          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 0 0      
Water Distribution | Operating Segments | Wholesale Market Sales Revenues          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 800 800      
Water Distribution | Operating Segments | Other Revenues from Contracts with Customers          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers 1,900 $ 1,200      
Water Distribution | Operating Segments | (Reserve for)/Amortization of Revenues Subject to Refund          
Disaggregation of Revenue [Line Items]          
Revenues from Contracts with Customers $ (400)