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COMMITMENTS AND CONTINGENCIES - CL&P Comprehensive Settlement Agreement (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Oct. 01, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jul. 14, 2021
Loss Contingencies [Line Items]          
Regulatory Liabilities   $ 602,432 $ 389,430    
Loss related to litigation settlement   81,274 0 $ 0  
Basis points reduction to return on equity, scenario one 0.90%        
Basis points reduction to return on equity, scenario two 0.45%        
The Connecticut Light and Power Company          
Loss Contingencies [Line Items]          
Regulatory Liabilities   266,489 137,166    
Loss related to litigation settlement   81,274 $ 0 $ 0  
Unfavorable Regulatory Action          
Loss Contingencies [Line Items]          
Loss related to litigation settlement   103,600      
Customer credits and assistance $ 75,000        
Loss related to litigation settlement, net of tax   $ 86,100      
Loss contingency, after-tax earnings impact per share (in dollars per share)   $ 0.25     $ (0.07)
Unfavorable Regulatory Action | Sales          
Loss Contingencies [Line Items]          
Loss related to litigation settlement   $ 65,000      
Unfavorable Regulatory Action | Oil and Gas, Operation and Maintenance          
Loss Contingencies [Line Items]          
Loss related to litigation settlement   10,000      
Unfavorable Regulatory Action | The Connecticut Light and Power Company          
Loss Contingencies [Line Items]          
Customer credits 65,000        
Customer assistance initiatives $ 10,000        
Regulatory Liabilities   75,000      
Unfavorable Regulatory Action | The Connecticut Light and Power Company | Sales          
Loss Contingencies [Line Items]          
Loss related to litigation settlement   $ 65,000