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Regulatory Matters - COVID-19 Regulatory Matters (Details) - COVID-19 - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 4 Months Ended 6 Months Ended
Apr. 30, 2021
Jun. 30, 2021
Jun. 30, 2021
Jun. 30, 2021
Jan. 01, 2021
Dec. 31, 2020
Public Utilities, General Disclosures [Line Items]            
Deferred costs   $ 0.9 $ 0.9 $ 0.9    
CECONY | Subsidiaries            
Public Utilities, General Disclosures [Line Items]            
Estimated forgone revenues   18.0   35.0    
CECONY | Electric and Gas Transmission Projects | Subsidiaries            
Public Utilities, General Disclosures [Line Items]            
Reserve adjustments       198.0    
Write off     15.0      
O&R | Subsidiaries            
Public Utilities, General Disclosures [Line Items]            
Estimated forgone revenues   $ 1.0   $ 2.0    
Late payment charges and fees $ 52.0          
Late payment charges and fees, surcharge recovery period       12 months    
O&R | Gas | Subsidiaries            
Public Utilities, General Disclosures [Line Items]            
Reserve adjustments       $ 7.0    
Write off     $ 3.0      
Residential Customers | CECONY | Subsidiaries            
Public Utilities, General Disclosures [Line Items]            
Deferred revenue           $ 54.9
Summer Cooling Credit Program | Residential Customers | CECONY | Subsidiaries            
Public Utilities, General Disclosures [Line Items]            
Expected deferred revenue         $ 63.4  
Cost of the program, recovery period       5 years