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Short-Term Borrowing (Details)
1 Months Ended
Mar. 31, 2023
USD ($)
Mar. 31, 2023
USD ($)
project
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
Short-term Debt [Line Items]        
Debt instrument term (in years) 364 days      
Commercial paper, outstanding $ 411,000,000 $ 411,000,000   $ 2,640,000,000
Loans outstanding under the credit agreement 0 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 5.40% 5.40%   4.80%
CECONY | Subsidiaries        
Short-term Debt [Line Items]        
Commercial paper, outstanding $ 405,000,000 $ 405,000,000   $ 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 5.40% 5.40%   4.80%