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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Mar. 31, 2022
Dec. 31, 2019
Loss Contingencies [Line Items]            
Bill of forgiveness   $ 521,752 $ 221,008 $ 264,950   $ 117,063
Regulatory Liabilities   890,786 602,432      
Loss related to litigation settlement   (72,041) 81,274 0    
Basis points reduction to return on equity, scenario one 0.90%          
Basis points reduction to return on equity, scenario two 0.45%          
CL&P            
Loss Contingencies [Line Items]            
Bill of forgiveness   20,327 74,788 99,809   $ 4,971
Regulatory Liabilities   336,048 266,489      
Loss related to litigation settlement   (72,041) 81,274 $ 0    
CL&P | Customer Assistance Fund            
Loss Contingencies [Line Items]            
Bill of forgiveness         $ 10,000  
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        
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 | CL&P            
Loss Contingencies [Line Items]            
Customer credits 65,000          
Customer assistance initiatives $ 10,000          
Regulatory Liabilities   75,000 75,000      
Unfavorable Regulatory Action | CL&P | Sales            
Loss Contingencies [Line Items]            
Loss related to litigation settlement     $ 65,000      
Unfavorable Regulatory Action | CL&P | Oil and Gas, Operation and Maintenance            
Loss Contingencies [Line Items]            
Loss related to litigation settlement   $ 10,000