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Regulatory Matters - Other Regulatory Matters Narrative (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023 | May 31, 2024 | May 31, 2023
Public Utilities, General Disclosures [Line Items] |  |  |  |
Other customer-provided capital rate (in percent) | 5.95% | 5.20% |  |
Return on regulatory assets | $ 3,095 | $ 2,541 |  |
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] |  |  |  |
Billing system costs | $ 510 |  |  |
Estimated capitalization costs | 89 |  |  |
Incremental costs |  |  | $ 51 |
Net regulatory assets | 1,066 | 1,113 |  |
CECONY | Maximum |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Capital expenditures limit | $ 421 | 38 |  | $ 421
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 | $ 2,873 | 2,359 |  |
O&R |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Net regulatory assets | 14 | 18 |  |
RECO | Subsidiaries |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Return on regulatory assets | $ 24 | $ 24 |  |

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