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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 |  |  |
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Jan. 31, 2023 | Jan. 31, 2021 | Jun. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2022 USD ($) | Jun. 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 |  |  |  | $ (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 |  |  |  |  |  |  |  |  |  |  |  |  |

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