XML 128 R93.htm IDEA: XBRL DOCUMENT v3.22.4
PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION - Schedule of Average Remaining Useful Lives of Depreciable Assets (Details)
12 Months Ended
Dec. 31, 2022
Property, Plant and Equipment [Line Items]  
Distribution - Electric 34 years 2 months 12 days
Distribution - Natural Gas 37 years 4 months 24 days
Transmission - Electric 39 years 9 months 18 days
Distribution - Water 39 years
Solar 22 years 10 months 24 days
Other 11 years
Computer Software, Hardware and Equipment | Minimum  
Property, Plant and Equipment [Line Items]  
Estimated useful life of property, plant and equipment 5 years
Computer Software, Hardware and Equipment | Maximum  
Property, Plant and Equipment [Line Items]  
Estimated useful life of property, plant and equipment 15 years
Buildings  
Property, Plant and Equipment [Line Items]  
Estimated useful life of property, plant and equipment 40 years
CL&P  
Property, Plant and Equipment [Line Items]  
Distribution - Electric 35 years
Transmission - Electric 36 years 3 months 18 days
NSTAR Electric  
Property, Plant and Equipment [Line Items]  
Distribution - Electric 34 years 7 months 6 days
Transmission - Electric 45 years 2 months 12 days
Solar 22 years 10 months 24 days
PSNH  
Property, Plant and Equipment [Line Items]  
Distribution - Electric 30 years 9 months 18 days
Transmission - Electric 39 years 3 months 18 days