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Regulatory Matters - COVID-19 Regulatory Matters (Details) - COVID-19 - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Jan. 01, 2021
Public Utilities, General Disclosures [Line Items]        
Deferred costs   $ 0.6    
CECONY        
Public Utilities, General Disclosures [Line Items]        
Estimated forgone revenues   17.0    
CECONY | Electric and Gas Transmission Projects        
Public Utilities, General Disclosures [Line Items]        
Reserve adjustments   106.0    
Write off   18.0    
O&R        
Public Utilities, General Disclosures [Line Items]        
Estimated forgone revenues   $ 1.0    
Late payment charges and fees     $ 52.0  
Late payment charges and fees, surcharge recovery period   12 months    
O&R | Gas        
Public Utilities, General Disclosures [Line Items]        
Reserve adjustments   $ 4.0    
Write off   $ 2.0    
Residential Customers | CECONY        
Public Utilities, General Disclosures [Line Items]        
Deferred revenue     $ 54.9  
Summer Cooling Credit Program | Residential Customers | CECONY        
Public Utilities, General Disclosures [Line Items]        
Expected deferred revenue       $ 63.4
Cost of the program, recovery period 5 years