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Regulatory Matters - Other Regulatory Matters (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022 | Apr. 30, 2023
Public Utilities, General Disclosures [Line Items] |  |  |  |
Other customer-provided capital rate (in percent) | 5.20% | 1.75% |  |
Return on regulatory assets | $ 2,406.0 |  | $ 2,304.0 |
Deferred derivative losses recovery period, current (in years) | 1 year |  |  |
Recovery period for deferred derivative losses (in years) | 3 years |  |  |
CECONY |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Estimated capitalization costs |  |  |  | $ 75.0
Billing system costs | $ 452.9 |  |  |
Net regulatory assets | $ 1,116.0 |  | 1,150.0 |
CECONY | Maximum |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Capital expenditures limit |  |  |  | $ 421.0
CECONY | Commodity |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Recovery period (in years) | 4 years |  |  |
CECONY | Subsidiaries |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Return on regulatory assets | $ 2,233.0 |  | 2,097.0 |
O&R |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Net regulatory assets | 19.0 |  | 22.0 |
RECO | Subsidiaries |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Return on regulatory assets | $ 19.0 |  | $ 21.0 |

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