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Regulatory Matters - COVID-19 Regulatory Matters (Details)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 13 Months Ended 25 Months Ended 34 Months Ended 40 Months Ended 42 Months Ended
Jan. 31, 2023
Jan. 31, 2021
Jun. 30, 2023
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Jun. 30, 2023
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Jun. 30, 2022
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Dec. 31, 2023
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Dec. 31, 2022
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Dec. 31, 2022
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Mar. 31, 2022
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Dec. 31, 2022
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Jun. 30, 2023
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Jun. 30, 2023
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Dec. 31, 2021
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Nov. 30, 2021
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Jan. 01, 2021
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Public Utilities, General Disclosures [Line Items]                              
Reserve adjustments       $ (47,000,000) $ 19,000,000                    
Subsidiaries                              
Public Utilities, General Disclosures [Line Items]                              
Reserve adjustments       (48,000,000) $ 20,000,000                    
CECONY | Subsidiaries | COVID-19 Arrears Assistance Program                              
Public Utilities, General Disclosures [Line Items]                              
Credits issued from government assistance     $ 0 343,200,000     $ 359,900,000                
Eligible credit recovery period (in years) 10 years                            
O&R | Subsidiaries | COVID-19 Arrears Assistance Program                              
Public Utilities, General Disclosures [Line Items]                              
Credits issued from government assistance     0 2,600,000     6,100,000                
Eligible credit recovery period (in years) 1 year                            
COVID-19                              
Public Utilities, General Disclosures [Line Items]                              
Deferred costs     $ 300,000 $ 300,000             $ 300,000 $ 300,000      
COVID-19 | Consolidated Edison Company of New York, Inc. And Orange And Rockland | Subsidiaries                              
Public Utilities, General Disclosures [Line Items]                              
Reserve for customer arrearages                         $ 7,000,000    
COVID-19 | Consolidated Edison Company of New York, Inc. And Orange And Rockland | Electric and Gas Transmission Projects | Subsidiaries                              
Public Utilities, General Disclosures [Line Items]                              
Write off                 $ 11,000,000 $ 46,000,000          
COVID-19 | CECONY | Subsidiaries                              
Public Utilities, General Disclosures [Line Items]                              
Reserve for customer arrearages                           $ 7,000,000  
COVID-19 | CECONY | Electric and Gas Transmission Projects | Subsidiaries                              
Public Utilities, General Disclosures [Line Items]                              
Percent of total customer bill impact per commodity (no more than)     0.005 0.005             0.005 0.005      
Reserve adjustments                       $ 202,000,000      
Write off                     $ 37,000,000        
Credits issued from government assistance             164,500,000                
Tax credit       $ 2,400,000     80,000,000                
COVID-19 | CECONY | Electric and Gas Transmission Projects | Subsidiaries | COVID-19 Arrears Phase 1 Assistance Program                              
Public Utilities, General Disclosures [Line Items]                              
Credits issued from government assistance       13,200,000     108,400,000                
COVID-19 | CECONY | Electric and Gas Transmission Projects | Subsidiaries | COVID-19 Arrears Phase 2 Assistance Program                              
Public Utilities, General Disclosures [Line Items]                              
Credits issued from government assistance       327,600,000                      
COVID-19 | CECONY | Gas | Subsidiaries                              
Public Utilities, General Disclosures [Line Items]                              
Late payment charges and fees               $ 7,000,000              
COVID-19 | CECONY | Gas | Subsidiaries | Year 1                              
Public Utilities, General Disclosures [Line Items]                              
Annual cap for late payment charges and write-offs       14,800,000                      
COVID-19 | CECONY | Gas | Subsidiaries | Year 2                              
Public Utilities, General Disclosures [Line Items]                              
Annual cap for late payment charges and write-offs       15,900,000                      
COVID-19 | CECONY | Gas | Subsidiaries | Year 3                              
Public Utilities, General Disclosures [Line Items]                              
Annual cap for late payment charges and write-offs       16,800,000                      
COVID-19 | CECONY | Gas | Subsidiaries | Scenario, Forecast                              
Public Utilities, General Disclosures [Line Items]                              
Late payment charges and fees           $ 4,000,000                  
COVID-19 | CECONY | Electric | Subsidiaries                              
Public Utilities, General Disclosures [Line Items]                              
Late payment charges and fees               $ 43,000,000              
COVID-19 | CECONY | Electric | Subsidiaries | Year 1                              
Public Utilities, General Disclosures [Line Items]                              
Annual cap for late payment charges and write-offs       57,300,000                      
COVID-19 | CECONY | Electric | Subsidiaries | Year 2                              
Public Utilities, General Disclosures [Line Items]                              
Annual cap for late payment charges and write-offs       60,300,000                      
COVID-19 | CECONY | Electric | Subsidiaries | Year 3                              
Public Utilities, General Disclosures [Line Items]                              
Annual cap for late payment charges and write-offs       $ 62,600,000                      
COVID-19 | CECONY | Electric | Subsidiaries | Scenario, Forecast                              
Public Utilities, General Disclosures [Line Items]                              
Late payment charges and fees           $ 19,000,000                  
COVID-19 | O&R | Electric and Gas Transmission Projects | Subsidiaries                              
Public Utilities, General Disclosures [Line Items]                              
Full recovery via surcharge limitation (in basis points)       0.0005                      
Credits issued from government assistance             1,600,000                
Tax credit       $ 400,000     1,300,000                
COVID-19 | O&R | Electric and Gas Transmission Projects | Subsidiaries | COVID-19 Arrears Phase 1 Assistance Program                              
Public Utilities, General Disclosures [Line Items]                              
Credits issued from government assistance       100,000     $ 3,200,000                
COVID-19 | O&R | Electric and Gas Transmission Projects | Subsidiaries | COVID-19 Arrears Phase 2 Assistance Program                              
Public Utilities, General Disclosures [Line Items]                              
Credits issued from government assistance       $ 2,100,000                      
COVID-19 | O&R | Gas | Subsidiaries                              
Public Utilities, General Disclosures [Line Items]                              
Reserve adjustments                       $ 3,000,000      
Write off                     $ 1,000,000        
Summer Cooling Credit Program | Residential Customers | COVID-19 | CECONY | Subsidiaries                              
Public Utilities, General Disclosures [Line Items]                              
Expected deferred revenue                             $ 63,400,000
Cost of the program, recovery period   5 years