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Short-Term Borrowing (Details)
1 Months Ended
Apr. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Short-term Debt [Line Items]      
Commercial paper, outstanding   $ 1,208,000,000 $ 1,692,000,000
Loans outstanding under the credit agreement   $ 0 $ 0
Commercial Paper      
Short-term Debt [Line Items]      
Weighted average interest rate   3.50% 2.00%
Subsequent Event      
Short-term Debt [Line Items]      
Minimum percentage of liens on assets 5.00%    
Failure to pay, maximum aggregate limit $ 150,000,000    
Subsequent Event | Term Loan      
Short-term Debt [Line Items]      
Debt term 270 days    
Subsequent Event | Revolving Credit      
Short-term Debt [Line Items]      
Aggregate amount of credit $ 750,000,000    
Increase in amount of loans available $ 250,000,000    
Maximum | Subsequent Event      
Short-term Debt [Line Items]      
Ratio of consolidated debt to consolidated total capital 0.65    
CECONY      
Short-term Debt [Line Items]      
Commercial paper, outstanding   $ 597,000,000 $ 1,137,000,000
CECONY | Commercial Paper      
Short-term Debt [Line Items]      
Weighted average interest rate   3.50% 2.00%