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Regulatory Matters - Rate Plans (Details) - USD ($) $ in Millions | 1 Months Ended | 10 Months Ended | 12 Months Ended | 36 Months Ended
--- | --- | --- | --- | ---
May 31, 2019 | Oct. 31, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2022
CECONY | Electric | Scenario, Forecast |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Return on common equity (as a percent) |  |  |  |  |  | 8.80%
CECONY | Gas | Scenario, Forecast |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Return on common equity (as a percent) |  |  |  |  |  | 8.80%
O&R | NYSPSC | Electric | Scenario, Forecast |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  | $ 5.8 | $ 8.0 | $ 13.4 |
O&R | NYSPSC | Gas | Scenario, Forecast |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  | $ 0.7 | $ 3.6 | $ (7.5) |
RECO | Electric |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Requested rate increase (decrease), amount | $ 19.9 |  |  |  |  |
Return on common equity (as a percent) | 49.93% |  |  |  |  |
Common equity ratio (as a percent) | 10.00% |  |  |  |  |
Subsequent Event | RECO | Electric |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Requested rate increase (decrease), amount |  | $ 20.3 |  |  |  |
Return on common equity (as a percent) |  | 50.16% |  |  |  |
Common equity ratio (as a percent) |  | 9.60% |  |  |  |
Subsequent Event | RECO | New Jersey Board of Public Utilities | Electric |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Requested rate increase (decrease), amount |  | $ 5.8 |  |  |  |
Return on common equity (as a percent) |  | 8.90% |  |  |  |
Common equity ratio (as a percent) |  | 47.14% |  |  |  |

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