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Regulatory Matters - COVID-19 Regulatory Matters (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 4 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Jan. 01, 2021 | Dec. 31, 2020
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Reserve adjustments |  |  |  |  | $ 165.0 | $ 48.0 |  |
Subsidiaries |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Reserve adjustments |  |  |  |  | 162.0 | 45.0 |  |
COVID-19 |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Deferred costs |  | $ 0.9 |  |  | 0.9 |  |  |
COVID-19 | CECONY | Subsidiaries |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Estimated forgone revenues |  | 11.0 | $ 17.0 |  | 46.0 | 36.0 |  |
COVID-19 | CECONY | Electric and Gas Transmission Projects | Subsidiaries |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Reserve adjustments |  |  |  |  | 235.0 |  |  |
Write off |  |  |  | $ 12.0 |  |  |  |
COVID-19 | O&R | Subsidiaries |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Estimated forgone revenues |  | $ 1.0 | $ 1.0 |  | $ 3.0 | $ 2.0 |  |
Late payment charges and fees | $ 52.0 |  |  |  |  |  |  |
Late payment charges and fees, surcharge recovery period |  |  |  |  | 12 months |  |  |
COVID-19 | O&R | Gas | Subsidiaries |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Reserve adjustments |  |  |  |  | $ 7.0 |  |  |
Write off |  |  |  | $ 2.0 |  |  |  |
Residential Customers | COVID-19 | CECONY | Subsidiaries |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Deferred revenue |  |  |  |  |  |  |  | $ 54.9
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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