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Short-Term Borrowing (Details)
Jul. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Apr. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Short-term Debt [Line Items]        
Commercial paper, outstanding   $ 1,813,000,000   $ 1,692,000,000
Loans outstanding under the credit agreement   $ 0   $ 0
Minimum percentage of liens on assets     5.00%  
Failure to pay, maximum aggregate limit     $ 150,000,000  
Commercial Paper        
Short-term Debt [Line Items]        
Weighted average interest rate   0.20%   2.00%
Subsequent Event        
Short-term Debt [Line Items]        
Face amount of debt $ 820,000,000      
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   $ 1,115,000,000   $ 1,137,000,000
CECONY | Commercial Paper        
Short-term Debt [Line Items]        
Weighted average interest rate   0.20%   2.00%