v3.26.1
Short-Term Borrowing (Details)
1 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
USD ($)
Mar. 31, 2026
USD ($)
extension
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Short-term Debt [Line Items]          
Maximum aggregate limit of failure to pay debt or derivative obligations   $ 150,000,000      
Repayments of debt     $ 500,000,000 $ 0  
Commercial paper, outstanding $ 721,000,000   $ 721,000,000    
Weighted average interest rate of commercial paper (in percent)     3.90%   3.90%
Notes payable 721,000,000   $ 721,000,000   $ 1,575,000,000
Debt Instrument, Covenant Compliance, Maximum Time to Pay Interest and Fees   5 days      
Maximum          
Short-term Debt [Line Items]          
Ratio of consolidated debt to consolidated total capital   0.65      
CECONY          
Short-term Debt [Line Items]          
Repayments of debt     500,000,000 $ 0  
Commercial paper, outstanding 480,000,000   $ 480,000,000    
Weighted average interest rate of commercial paper (in percent)     3.90%   3.90%
Notes payable 480,000,000   $ 480,000,000   $ 1,240,000,000
March 2023 Credit Agreement Variable Rate 364 Day Revolving Credit Agreement          
Short-term Debt [Line Items]          
Letters of credit were outstanding 0   0    
Credit Agreement Variable Rate 364 Day Revolving Credit Agreement          
Short-term Debt [Line Items]          
Letters of credit were outstanding 0   0    
March 2025 Credit Agreement Variable Rate 364 Day Revolving Credit Agreement          
Short-term Debt [Line Items]          
Letters of credit were outstanding $ 0   $ 0    
November 2025 Credit Agreement Variable Rate 364 Day Revolving Credit Agreement          
Short-term Debt [Line Items]          
Debt instrument term (in years)   364 days      
Repayments of debt   $ 500,000,000      
Revolving Credit Facility          
Short-term Debt [Line Items]          
Maximum borrowing capacity   $ 1,000,000,000      
Revolving Credit Facility | March 2023 Credit Agreement Variable Rate 364 Day Revolving Credit Agreement | CECONY | Subsidiaries          
Short-term Debt [Line Items]          
Debt instrument term (in years) 364 days 364 days      
Revolving Credit Facility | Credit Availability Through March 2028          
Short-term Debt [Line Items]          
Maximum borrowing capacity   $ 800,000,000      
Revolving Credit Facility | Credit Availability Through March 2028 | CECONY          
Short-term Debt [Line Items]          
Debt instrument term (in years)   1 year      
Maximum borrowing capacity   $ 3,500,000,000      
Debt Instrument, Number of Extensions | extension   2      
Letter of Credit          
Short-term Debt [Line Items]          
Maximum borrowing capacity   $ 900,000,000