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PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION -Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jul. 31, 2020
Dec. 31, 2020
Dec. 31, 2021
Property, Plant and Equipment [Line Items]      
Total Assets (as of)   $ 46,099,598 $ 48,492,144
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Hingham Water System      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, net $ 63,900    
Goodwill 23,600    
Proceeds from the sale of Hingham Water System $ 110,500    
Pre-tax gain (loss) on sale of property, plant and equipment   16,000  
After-tax gain (loss) on the sale of property, plant and equipment   3,500  
Eversource Gas Company of Massachusetts      
Property, Plant and Equipment [Line Items]      
Total Assets (as of)   $ 1,200,000