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Short-Term Borrowing (Details)
Sep. 30, 2020
USD ($)
Jul. 31, 2020
USD ($)
Apr. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Short-term Debt [Line Items]        
Commercial paper, outstanding $ 1,009,000,000     $ 1,692,000,000
Loans outstanding under the credit agreement 0     $ 0
Face amount of debt   $ 820,000,000    
Minimum percentage of liens on assets     5.00%  
Failure to pay, maximum aggregate limit     $ 150,000,000  
Term Loan        
Short-term Debt [Line Items]        
Outstanding borrowings $ 820,000,000      
Commercial Paper        
Short-term Debt [Line Items]        
Weighted average interest rate 0.20%     2.00%
Maximum        
Short-term Debt [Line Items]        
Ratio of consolidated debt to consolidated total capital     0.65  
CECONY        
Short-term Debt [Line Items]        
Commercial paper, outstanding $ 991,000,000     $ 1,137,000,000
CECONY | Commercial Paper        
Short-term Debt [Line Items]        
Weighted average interest rate 0.20%     2.00%