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Regulatory Matters - Rate Plans (Details) $ in Millions |  |  |  | 1 Months Ended | 36 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2024 USD ($) | Aug. 30, 2022 USD ($) | Dec. 31, 2021 USD ($) | Aug. 31, 2023 USD ($) substation | Jul. 31, 2023 USD ($) | Apr. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) | Sep. 30, 2023 USD ($) | May 31, 2023 USD ($)
Brooklyn Clean Energy Hub |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Estimated cost recovery |  |  |  |  |  | $ 810.0 |  |  |
Eastern Queens Reliability Project |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Estimated cost recovery |  |  |  | $ 1,200.0 |  |  |  |  |
CECONY |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Number of substations | substation |  |  |  | 2 |  |  |  |  |
Deferred costs |  |  |  |  |  |  |  | $ 3.0 |
CECONY | Electric | Year 1 |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  | $ 442.0 |  | $ 457.0 |  |
CECONY | Electric | Year 2 |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  | 518.0 |  | 457.0 |  |
CECONY | Electric | Year 3 |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  | $ 382.0 |  | 457.0 |  |
CECONY | Electric | Subsidiaries |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Return on common equity (as a percent) |  |  |  |  | 9.25% |  |  |  |
Common equity ratio (percent) |  |  |  |  | 48.00% |  |  |  |
Capital expenditures |  |  |  |  | $ 8,513.0 |  |  |  |
CECONY | Gas | Year 1 |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  | 217.0 |  | 187.0 |  |
CECONY | Gas | Year 2 |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  | 173.0 |  | 187.0 |  |
CECONY | Gas | Year 3 |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  | 122.0 |  | $ 187.0 |  |
CECONY | Gas | Subsidiaries |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  | $ 3,297.0 |  |  |  |
CECONY | Electric and Gas Transmission Projects | Subsidiaries |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Rate plan, term (in years) |  |  |  |  | 3 years |  |  |  |
RECO |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Deferred costs |  |  |  |  |  |  |  |  | $ 5.1
RECO | Electric |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  | $ 18.2 | $ 16.9 |  |  |  |  |  |
RECO | Electric | Scenario, Forecast |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount | $ 20.7 |  |  |  |  |  |  |  |

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