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COMMON SHARES - Common Shares Authorized and Issued (Details) - $ / shares
Dec. 31, 2024
Dec. 31, 2023
May 03, 2023
May 02, 2023
Dec. 31, 2022
Class of Stock [Line Items]          
Per share par value (in dollars per share) $ 5 $ 5     $ 5
Authorized (in shares) 410,000,000 410,000,000 410,000,000 380,000,000  
Issued (in shares) 375,724,367 359,984,073      
CL&P          
Class of Stock [Line Items]          
Per share par value (in dollars per share) $ 10 $ 10      
Authorized (in shares) 24,500,000 24,500,000      
Issued (in shares) 6,035,205 6,035,205      
NSTAR Electric          
Class of Stock [Line Items]          
Per share par value (in dollars per share) $ 1 $ 1      
Authorized (in shares) 100,000,000 100,000,000      
Issued (in shares) 200 200      
PSNH          
Class of Stock [Line Items]          
Per share par value (in dollars per share) $ 1 $ 1      
Authorized (in shares) 100,000,000 100,000,000      
Issued (in shares) 301 301