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DERIVATIVE INSTRUMENTS - Summary of Level 3 Derivative Contracts and Significant Unobservable Inputs Used (Details) - CL&P - Forward Reserve Prices - Level 3 - $ / KWmo
Sep. 30, 2022
Dec. 31, 2021
Minimum    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Derivative measurement input 0.44 0.50
Maximum    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Derivative measurement input 0.50 1.15
Weighted Average    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Derivative measurement input 0.47 0.82