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PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION - Investment in Utility Property, Plant and Equipment By Asset (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
Distribution - Electric $ 17,679,100 $ 16,703,200
Distribution - Natural Gas 6,694,800 6,111,200
Transmission - Electric 12,882,400 11,954,000
Distribution - Water 1,900,900 1,743,100
Solar 200,900 201,500
Utility 39,358,100 36,713,000
Other 1,469,500 1,269,000
Property, Plant and Equipment, Gross 40,827,600 37,982,000
Less:  Accumulated Depreciation    
Utility     (8,885,200) (8,476,300)
Other (580,100) (477,600)
Total Accumulated Depreciation (9,465,300) (8,953,900)
Property, Plant and Equipment, Net 31,362,300 29,028,100
Construction Work in Progress 2,015,400 1,854,400
Total Property, Plant and Equipment, Net 33,377,650 30,882,523
The Connecticut Light and Power Company    
Property, Plant and Equipment [Line Items]    
Distribution - Electric 7,117,600 6,820,700
Transmission - Electric 5,859,000 5,512,000
Solar 0 0
Property, Plant and Equipment, Gross 12,976,600 12,332,700
Less:  Accumulated Depreciation    
Total Accumulated Depreciation (2,572,100) (2,475,400)
Property, Plant and Equipment, Net 10,404,500 9,857,300
Construction Work in Progress 399,000 377,300
Total Property, Plant and Equipment, Net 10,803,543 10,234,556
NSTAR Electric Company    
Property, Plant and Equipment [Line Items]    
Distribution - Electric 8,105,500 7,544,400
Transmission - Electric 5,090,500 4,701,300
Solar 200,900 201,500
Property, Plant and Equipment, Gross 13,396,900 12,447,200
Less:  Accumulated Depreciation    
Total Accumulated Depreciation (3,227,300) (3,074,100)
Property, Plant and Equipment, Net 10,169,600 9,373,100
Construction Work in Progress 707,000 750,000
Total Property, Plant and Equipment, Net 10,876,614 10,123,062
Public Service Company of New Hampshire    
Property, Plant and Equipment [Line Items]    
Distribution - Electric 2,496,200 2,378,400
Transmission - Electric 1,934,600 1,742,400
Solar 0 0
Property, Plant and Equipment, Gross 4,430,800 4,120,800
Less:  Accumulated Depreciation    
Total Accumulated Depreciation (908,400) (848,900)
Property, Plant and Equipment, Net 3,522,400 3,271,900
Construction Work in Progress 134,100 102,400
Total Property, Plant and Equipment, Net $ 3,656,462 $ 3,374,270