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Short-Term Borrowing (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2025
USD ($)
Jan. 31, 2025
USD ($)
Nov. 30, 2024
USD ($)
Mar. 31, 2024
USD ($)
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Short-term Debt [Line Items]            
Debt instrument term (in years)     364 days      
Maximum aggregate limit of failure to pay debt or derivative obligations $ 150,000,000   $ 150,000,000   $ 150,000,000  
Short-term borrowings   $ 200,000,000 $ 500,000,000      
Ratio of consolidated debt to consolidated total capital     0.65      
Commercial paper, outstanding 350,000,000       $ 350,000,000 $ 2,170,000,000
Weighted average interest rate of commercial paper (in percent)         4.60% 470.00%
Loans payable $ 0       $ 0 $ 0
Maximum            
Short-term Debt [Line Items]            
Ratio of consolidated debt to consolidated total capital 0.65       0.65  
CECONY            
Short-term Debt [Line Items]            
Commercial paper, outstanding           $ 1,694,000,000
Weighted average interest rate of commercial paper (in percent)         4.60% 470.00%
Revolving Credit Facility | Credit Availability Through March 2028            
Short-term Debt [Line Items]            
Maximum borrowing capacity $ 2,500,000,000       $ 2,500,000,000 $ 2,500,000,000
Subsidiaries | CECONY            
Short-term Debt [Line Items]            
Loans payable $ 0       $ 0 $ 0
Subsidiaries | Revolving Credit Facility | March 2023 Credit Agreement Variable Rate 364 Day Revolving Credit Agreement | CECONY            
Short-term Debt [Line Items]            
Debt instrument term (in years) 364 days          
Maximum borrowing capacity       $ 500,000,000    
Subsidiaries | Revolving Credit Facility | March 2022 Credit Agreement Variable Rate 364 Day Revolving Credit Agreement | CECONY            
Short-term Debt [Line Items]            
Debt instrument term (in years)       364 days