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Short-Term Borrowing (Details)
1 Months Ended 12 Months Ended
Jan. 31, 2023
USD ($)
Aug. 31, 2022
USD ($)
Jun. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Short-term Debt [Line Items]            
Commercial paper, outstanding         $ 2,640,000,000 $ 1,488,000,000
Weighted average interest rate (percent)         4.80% 0.30%
Loans outstanding under credit agreement         $ 0 $ 0
Maximum ratio of consolidated debt to consolidated total capital         0.54  
Minimum percentage of liens on assets     0.05   0.05  
Failure to pay, maximum aggregate limit     $ 150,000,000   $ 150,000,000  
Short-term borrowings     400,000,000      
Debt instrument, face amount     $ 400,000,000      
Debt term (in years)     364 days      
Interest Rate         4.94%  
Ratio of consolidated debt to consolidated total capital     0.65      
Subsequent Event            
Short-term Debt [Line Items]            
Short-term borrowings $ 200,000,000          
Debt instrument, face amount $ 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         $ 1,500,000,000  
Current amount available         1,000,000,000  
Letters of Credit            
Short-term Debt [Line Items]            
Maximum borrowing capacity         1,200,000,000  
CECONY            
Short-term Debt [Line Items]            
Commercial paper, outstanding         $ 2,300,000,000 $ 1,361,000,000
Weighted average interest rate (percent)         4.80% 0.30%
Maximum ratio of consolidated debt to consolidated total capital         0.56  
Clean Energy Businesses            
Short-term Debt [Line Items]            
Short-term borrowings   $ 150,000,000        
Debt term (in years)   364 days        
Interest Rate         5.06%  
Credit Availability Through December 2022 | CECONY | Revolving Credit            
Short-term Debt [Line Items]            
Maximum borrowing capacity         $ 2,250,000,000  
Credit Availability Through December 2023 | CECONY | Revolving Credit            
Short-term Debt [Line Items]            
Maximum borrowing capacity         $ 2,200,000,000  
March 2022 Credit Agreement Variable Rate 364 Day Revolving Credit Agreement | Revolving Credit | Subsidiaries            
Short-term Debt [Line Items]            
Maximum borrowing capacity       $ 750,000,000    
Debt term (in years)       364 days