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Regulatory Matters - Other Regulatory Matters Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Apr. 30, 2023
Public Utilities, General Disclosures [Line Items] |  |  |  |
Other customer-provided capital rate (in percent) | 5.95% | 5.20% |  |
Return on regulatory assets | $ 2,949 |  | $ 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] |  |  |  |
Estimated capitalization costs | $ 88 |  |  |
Billing system costs | 509 |  |  |
Net regulatory assets | 1,094 |  | 1,113 |
CECONY | Maximum |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Capital expenditures limit | $ 421 |  |  | $ 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 | $ 2,772 |  | 2,359 |
O&R |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Net regulatory assets | 17 |  | 18 |
RECO | Subsidiaries |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Return on regulatory assets | $ 22 |  | $ 24 |

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