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PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Public Utility, Property, Plant and Equipment [Line Items]    
Distribution - Electric $ 15,737,600 $ 15,071,100
Distribution - Natural Gas 3,723,700 3,546,200
Transmission - Electric 10,570,600 10,153,900
Distribution - Water 1,686,300 1,639,800
Solar 199,200 164,100
Utility 31,917,400 30,575,100
Other 935,200 778,600
Property, Plant and Equipment, Gross 32,852,600 31,353,700
Less: Accumulated Depreciation    
Utility (7,417,600) (7,126,200)
Other (375,100) (336,700)
Total Accumulated Depreciation (7,792,700) (7,462,900)
Property, Plant and Equipment, Net 25,059,900 23,890,800
Construction Work in Progress 1,852,000 1,719,600
Total Property, Plant and Equipment, Net 26,911,877 25,610,428
CL&P    
Public Utility, Property, Plant and Equipment [Line Items]    
Distribution - Electric 6,417,900 6,176,400
Transmission - Electric 4,938,500 4,700,500
Solar 0 0
Property, Plant and Equipment, Gross 11,356,400 10,876,900
Less: Accumulated Depreciation    
Total Accumulated Depreciation (2,370,600) (2,302,600)
Property, Plant and Equipment, Net 8,985,800 8,574,300
Construction Work in Progress 470,800 335,400
Total Property, Plant and Equipment, Net 9,456,562 8,909,701
NSTAR Electric    
Public Utility, Property, Plant and Equipment [Line Items]    
Distribution - Electric 7,102,300 6,756,400
Transmission - Electric 4,186,600 4,065,900
Solar 199,200 164,100
Property, Plant and Equipment, Gross 11,488,100 10,986,400
Less: Accumulated Depreciation    
Total Accumulated Depreciation (2,860,300) (2,702,000)
Property, Plant and Equipment, Net 8,627,800 8,284,400
Construction Work in Progress 636,400 510,300
Total Property, Plant and Equipment, Net 9,264,180 8,794,700
PSNH    
Public Utility, Property, Plant and Equipment [Line Items]    
Distribution - Electric 2,257,700 2,178,600
Transmission - Electric 1,440,700 1,338,700
Solar 0 0
Property, Plant and Equipment, Gross 3,698,400 3,517,300
Less: Accumulated Depreciation    
Total Accumulated Depreciation (803,000) (772,900)
Property, Plant and Equipment, Net 2,895,400 2,744,400
Construction Work in Progress 136,600 135,700
Total Property, Plant and Equipment, Net $ 3,031,985 $ 2,880,073