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Short-Term Borrowing (Details)
1 Months Ended
Mar. 31, 2023
USD ($)
Mar. 31, 2023
USD ($)
project
Mar. 31, 2022
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Short-term Debt [Line Items]          
Debt instrument term (in years) 364 days        
Commercial paper, outstanding       $ 1,953,000,000 $ 2,640,000,000
Loans outstanding under the credit agreement       $ 0 $ 0
Ratio of consolidated debt to consolidated total capital         65
Percentage of liens of companies consolidated asset         0.10
Maximum aggregate limit of failure to pay debt or derivative obligations         $ 150,000,000
Revolving Credit Facility          
Short-term Debt [Line Items]          
Maximum borrowing capacity $ 1,000,000,000 $ 1,000,000,000      
Letter of Credit          
Short-term Debt [Line Items]          
Maximum borrowing capacity 900,000,000 $ 900,000,000      
March 2022 Credit Agreement Variable Rate 364 Day Revolving Credit Agreement | Revolving Credit Facility | Subsidiaries          
Short-term Debt [Line Items]          
Debt instrument term (in years)     364 days    
March 2023 Credit Agreement Variable Rate 364 Day Revolving Credit Agreement | Revolving Credit Facility | Subsidiaries          
Short-term Debt [Line Items]          
Maximum borrowing capacity     $ 500,000,000    
Debt instrument term (in years)   364 days      
January 2023 Borrowing          
Short-term Debt [Line Items]          
Repayments of debt   $ 200,000,000      
June 2022 Borrowing          
Short-term Debt [Line Items]          
Repayments of debt   400,000,000      
Credit Availability Through March 2028 | Revolving Credit Facility          
Short-term Debt [Line Items]          
Maximum borrowing capacity 800,000,000 800,000,000      
Commercial Paper          
Short-term Debt [Line Items]          
Weighted average interest rate (in percent)       5.40% 4.80%
CECONY | Subsidiaries          
Short-term Debt [Line Items]          
Commercial paper, outstanding       $ 1,946,000,000 $ 2,300,000,000
CECONY | Credit Availability Through March 2028 | Revolving Credit Facility          
Short-term Debt [Line Items]          
Maximum borrowing capacity $ 2,500,000,000 $ 2,500,000,000      
Number of extensions | project   2      
Debt instrument term (in years)   1 year      
CECONY | Commercial Paper | Subsidiaries          
Short-term Debt [Line Items]          
Weighted average interest rate (in percent)       5.40% 4.80%