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Regulatory Matters - COVID-19 Regulatory Matters (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 13 Months Ended | 25 Months Ended | 34 Months Ended | 43 Months Ended | 45 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2023 | Jan. 31, 2021 | Sep. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2022 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2021 USD ($) | Nov. 30, 2021 USD ($) | Jan. 01, 2021 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserve adjustments |  |  |  |  | $ (46.0) | $ (12.0) |  |  |  |  |  |  |  |  |  |  |
CECONY |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserve adjustments |  |  |  |  | (45.0) | $ (7.0) |  |  |  |  |  |  |  |  |  |  |
Deferred costs |  |  | $ 3.0 |  | 3.0 |  |  |  |  |  |  | $ 3.0 | $ 3.0 |  |  |  |
CECONY | Subsidiaries | COVID-19 Arrears Assistance Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credits issued from government assistance |  |  | 4.9 |  | 348.4 |  |  | $ 359.9 |  |  |  |  |  |  |  |  |
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 |  | $ 2.8 |  |  | 6.1 |  |  |  |  |  |  |  |  |
Eligible credit recovery period (in years) | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
COVID-19 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred costs |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.3 |  |  |
COVID-19 | Consolidated Edison Company of New York, Inc. And Orange And Rockland | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserve for customer arrearages |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7.0 |  |
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 |  |  |  |  |  |  |  |  |  | $ 11.0 | $ 46.0 |  |  |  |  |  |
COVID-19 | CECONY | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserve for customer arrearages |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7.0 |
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 |  |  |  |  |  |  |  |  |  |  |  |  | $ 205.0 |  |  |  |
Write off |  |  |  |  |  |  |  |  |  |  |  | $ 55.0 |  |  |  |  |
Credits issued from government assistance |  |  |  | $ 164.5 |  |  |  |  |  |  |  |  |  |  |  |  |
Tax credit |  |  |  |  | $ 7.6 |  |  | 80.0 |  |  |  |  |  |  |  |  |
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 |  |  |  | 108.4 | 13.2 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  | 327.6 |  |  |  |  |  |  |  |  |  |  |  |
COVID-19 | CECONY | Gas | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Late payment charges and fees |  |  |  |  |  |  |  |  | $ 7.0 |  |  |  |  |  |  |  |
COVID-19 | CECONY | Gas | Subsidiaries | Year 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual cap for late payment charges and write-offs |  |  |  |  | 14.8 |  |  |  |  |  |  |  |  |  |  |  |
COVID-19 | CECONY | Gas | Subsidiaries | Year 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual cap for late payment charges and write-offs |  |  |  |  | 15.9 |  |  |  |  |  |  |  |  |  |  |  |
COVID-19 | CECONY | Gas | Subsidiaries | Year 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual cap for late payment charges and write-offs |  |  |  |  | 16.8 |  |  |  |  |  |  |  |  |  |  |  |
COVID-19 | CECONY | Gas | Subsidiaries | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Late payment charges and fees |  |  |  |  |  |  | $ 4.0 |  |  |  |  |  |  |  |  |  |
COVID-19 | CECONY | Electric | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Late payment charges and fees |  |  |  |  |  |  |  |  | $ 43.0 |  |  |  |  |  |  |  |
COVID-19 | CECONY | Electric | Subsidiaries | Year 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual cap for late payment charges and write-offs |  |  |  |  | 57.3 |  |  |  |  |  |  |  |  |  |  |  |
COVID-19 | CECONY | Electric | Subsidiaries | Year 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual cap for late payment charges and write-offs |  |  |  |  | 60.3 |  |  |  |  |  |  |  |  |  |  |  |
COVID-19 | CECONY | Electric | Subsidiaries | Year 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual cap for late payment charges and write-offs |  |  |  |  | $ 62.6 |  |  |  |  |  |  |  |  |  |  |  |
COVID-19 | CECONY | Electric | Subsidiaries | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Late payment charges and fees |  |  |  |  |  |  | $ 19.0 |  |  |  |  |  |  |  |  |  |
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 |  |  |  | 1.6 |  |  |  |  |  |  |  |  |  |  |  |  |
Tax credit |  |  |  |  | $ 0.6 |  |  | $ 1.3 |  |  |  |  |  |  |  |  |
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 |  |  |  | $ 3.2 | 0.1 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  | $ 2.1 |  |  |  |  |  |  |  |  |  |  |  |
COVID-19 | O&R | Gas | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserve adjustments |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.0 |  |  |  |
Write off |  |  |  |  |  |  |  |  |  |  |  | $ 2.0 |  |  |  |  |
Summer Cooling Credit Program | Residential Customers | COVID-19 | CECONY | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected deferred revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 63.4
Cost of the program, recovery period |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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