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Short-Term Borrowing (Details)
1 Months Ended
Apr. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Short-term Debt [Line Items]      
Commercial paper, outstanding   $ 1,581,000,000 $ 1,705,000,000
Loans outstanding under the credit agreement   0 0
Variable Rate Construction Loan Facility Maturing November 2021 | Clean Energy Businesses | Line of Credit      
Short-term Debt [Line Items]      
Outstanding borrowings   472,000,000 165,000,000
Banks' commitments under construction loan facility   $ 574,000,000 $ 613,000,000
April 2021 Credit Agreement, Variable Rate 364 Day Term Loan | Line of Credit | Subsequent Event      
Short-term Debt [Line Items]      
Maximum borrowing capacity $ 500,000,000    
Covenant compliance, consolidated debt to consolidated total capital ratio 0.65    
Covenant compliance, failure to make one or more payments in respect of material financial obligations, amount threshold $ 150,000,000    
Covenant compliance, event resulting in acceleration of maturity of debt, amount threshold $ 150,000,000    
Commercial Paper      
Short-term Debt [Line Items]      
Weighted average interest rate   0.20% 0.30%
Debentures | Series 2016A Debentures Maturing May 15, 2021 | Subsequent Event      
Short-term Debt [Line Items]      
Interest rate 2.00%    
CECONY      
Short-term Debt [Line Items]      
Commercial paper, outstanding   $ 1,427,000,000 $ 1,660,000,000
CECONY | Commercial Paper      
Short-term Debt [Line Items]      
Weighted average interest rate   0.20% 0.30%