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Regulatory Matters - COVID-19 Regulatory Matters (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended | 13 Months Ended | 22 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jan. 01, 2021
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Reserve adjustments |  | $ 169,000 | $ 78,000 | $ 8,000 |  |  |  |
CECONY |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Reserve adjustments |  | 166,000 | $ 74,000 | $ 7,000 |  |  |  |
COVID-19 |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Deferred costs |  | 900 |  |  |  |  | $ 900 |
COVID-19 | CECONY |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Reserve adjustments |  | 239,000 |  |  |  |  |  |
Allowance for credit loss, write-off |  |  |  |  |  |  | 8,000 |
COVID-19 | CECONY | Subsidiaries |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Reserve for customer arrearages |  | 7,000 |  |  |  |  | 7,000 |
COVID-19 | CECONY | Electric | Subsidiaries | Scenario, Forecast |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Late payment charges and fees |  |  |  |  | $ 19,000 | $ 43,000 |  |
COVID-19 | CECONY | Gas | Subsidiaries | Scenario, Forecast |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Late payment charges and fees |  |  |  |  | $ 4,000 | $ 7,000 |  |
COVID-19 | O&R |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Reserve adjustments |  | 7,000 |  |  |  |  |  |
Allowance for credit loss, write-off |  |  |  |  |  |  | 3,000 |
Residential Customers | COVID-19 | CECONY | Subsidiaries |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Deferred revenue |  | $ 54,900 |  |  |  |  | $ 54,900 |
Summer Cooling Credit Program | Residential Customers | COVID-19 | CECONY | Subsidiaries |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Expected deferred revenue |  |  |  |  |  |  |  | $ 63,400
Cost of the program, recovery period | 5 years |  |  |  |  |  |  |

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