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Regulatory Matters - COVID-19 Regulatory Matters (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 4 Months Ended | 12 Months Ended | 13 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2022 | Mar. 31, 2022 | Mar. 31, 2021 | Jun. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Jan. 31, 2023 | Dec. 31, 2022 | Nov. 30, 2021 | Jan. 01, 2021
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Reserve adjustments |  | $ 19.0 | $ 33.0 |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Reserve adjustments |  | 20.0 | $ 33.0 |  |  |  |  |  |  |
CECONY | State Office of Temporary Disability Assistance (OTDA) |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from government assistance |  | 5.9 |  |  |  |  |  |  |  |
CECONY | State Office of Temporary Disability Assistance (OTDA) | Subsequent Event |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from government assistance | $ 13.7 |  |  |  |  |  |  |  |  |
Income tax credit | $ 12.2 |  |  |  |  |  |  |  |  |
COVID-19 |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Deferred costs |  | 0.8 |  |  |  |  |  |  |  |
COVID-19 | CECONY | Subsidiaries |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Reserve for customer arrearages |  |  |  |  |  |  |  |  | $ 7.0 |
COVID-19 | CECONY | Gas | Subsidiaries | Scenario, Forecast |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Late payment charges and fees |  |  |  |  |  |  | $ 4.0 | $ 7.0 |  |
COVID-19 | CECONY | Electric and Gas Transmission Projects | Subsidiaries |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Reserve adjustments |  | 260.0 |  |  |  |  |  |  |  |
Write off |  |  |  | $ 1.0 |  |  |  |  |  |
COVID-19 | CECONY | Electric | Subsidiaries | Scenario, Forecast |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Late payment charges and fees |  |  |  |  |  |  | $ 19.0 | $ 43.0 |  |
COVID-19 | O&R | Gas | Subsidiaries |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Late payment charges and fees |  |  |  |  | $ 2.4 |  |  |  |  |
Reserve adjustments |  | $ 6.0 |  |  |  |  |  |  |  |
Write off |  |  |  | $ 3.0 |  |  |  |  |  |
COVID-19 | O&R | Electric | Subsidiaries |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Late payment charges and fees |  |  |  |  |  | $ 1.7 |  |  |  |
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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