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Revenue Recognition - Additional information (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 13 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2021 | Dec. 31, 2023 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2022 | Sep. 30, 2022
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Remaining performance obligation |  |  |  |  |  |  |  | $ 303.0
Late fee and other fees not collected |  | $ 12.0 | $ 49.0 |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-10-01 |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Remaining performance obligation |  |  |  |  |  |  |  | $ 265.0
Expected timing of satisfaction |  |  |  |  |  |  |  | 2 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-10-02 |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Remaining performance obligation |  |  |  |  |  |  |  | $ 38.0
Expected timing of satisfaction |  |  |  |  |  |  |  |
CECONY | Subsidiaries |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Late fee and other fees not collected |  | $ 11.0 | $ 46.0 |  |  |  |  |
CECONY | COVID-19 | Subsidiaries | Scenario, Forecast | Electric |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Late payment charges and fees |  |  |  | $ 19.0 |  |  | $ 43.0 |
CECONY | COVID-19 | Subsidiaries | Scenario, Forecast | Gas |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Late payment charges and fees |  |  |  | $ 4.0 |  |  | $ 7.0 |
O&R | Subsidiaries | Electric and Gas Transmission Projects |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Rate plan, term | 3 years |  |  |  |  |  |  |
O&R | COVID-19 | Subsidiaries | Electric |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Late payment charges and fees |  |  |  |  |  | $ 1.7 |  |
O&R | COVID-19 | Subsidiaries | Gas |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Late payment charges and fees |  |  |  |  | $ 2.4 |  |  |

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