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Short-Term Borrowing (Details)
1 Months Ended 12 Months Ended
Jan. 31, 2025
USD ($)
Nov. 30, 2024
USD ($)
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Short-term Debt [Line Items]            
Debt term (in years)   364 days        
Commercial paper, outstanding         $ 2,170,000,000 $ 2,288,000,000
Weighted average interest rate (percent)         4.70% 5.60%
Loans outstanding under credit agreement         $ 0 $ 0
Maximum ratio of consolidated debt to consolidated total capital         0.56  
Failure to pay, maximum aggregate limit   $ 150,000,000     $ 150,000,000 150,000,000
Short-term borrowings   $ 500,000,000        
Ratio of consolidated debt to consolidated total capital   0.65        
Subsequent Event            
Short-term Debt [Line Items]            
Short-term borrowings $ 200,000,000          
Maximum            
Short-term Debt [Line Items]            
Maximum ratio of consolidated debt to consolidated total capital         0.65  
Revolving Credit            
Short-term Debt [Line Items]            
Maximum borrowing capacity     $ 1,000,000,000      
Letters of Credit            
Short-term Debt [Line Items]            
Maximum borrowing capacity     900,000,000      
CECONY            
Short-term Debt [Line Items]            
Commercial paper, outstanding         $ 1,694,000,000 $ 1,903,000,000
Weighted average interest rate (percent)         4.70% 5.60%
Maximum ratio of consolidated debt to consolidated total capital         0.57  
March 2022 Credit Agreement Variable Rate 364 Day Revolving Credit Agreement | Revolving Credit | Subsidiaries            
Short-term Debt [Line Items]            
Debt term (in years)       364 days    
Credit Availability Through March 2028 | Revolving Credit            
Short-term Debt [Line Items]            
Maximum borrowing capacity     800,000,000      
Credit Availability Through March 2028 | CECONY | Revolving Credit            
Short-term Debt [Line Items]            
Maximum borrowing capacity     $ 2,500,000,000      
Debt term (in years)     1 year      
March 2023 Credit Agreement Variable Rate 364 Day Revolving Credit Agreement | Revolving Credit | Subsidiaries            
Short-term Debt [Line Items]            
Maximum borrowing capacity       $ 500,000,000    
Debt term (in years)     364 days