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Regulatory Matters - Rate Plans (Details) $ in Millions |  | 1 Months Ended | 2 Months Ended | 36 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2021 USD ($) | Apr. 30, 2023 USD ($) state | Mar. 31, 2023 USD ($) | Feb. 28, 2023 USD ($) | Nov. 30, 2022 USD ($) | Jan. 31, 2022 USD ($) | Apr. 30, 2023 USD ($) state | Dec. 31, 2022 USD ($)
Subsequent Event |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Number of states | state |  | 7 |  |  |  |  | 7 |
Subsequent Event | Brooklyn Clean Energy Hub |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Estimated cost recovery |  | $ 810.0 |  |  |  |  |  |
CECONY | Subsequent Event |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Federal grants applied for |  |  |  |  |  |  | $ 177.0 |
CECONY | Subsequent Event | Federal Grants Used For Carbon-Free Hydrogen |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Federal grants applied for |  |  |  |  |  |  | 116.0 |
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 |  |  |  | $ 8,500.0 |  |  |  |
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 |  |  |  | 3,300.0 |  |  |  |
CECONY | Steam |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  | $ 94.0 |  |  |  |  |
Common equity ratio (percent) |  |  |  |  | 50.00% |  |  |
Deviation of actual inflation rate from assumed revenue requirement |  |  |  |  | 0.0050 |  |  |
Return on common equity (percent) |  |  |  |  | 10.00% |  |  |
CECONY | Steam | Year 1 |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  | 4.0 |  |  |  |
Total requested amount |  |  |  | 141.0 |  |  |  |
CECONY | Steam | Year 2 |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  | 1.0 | $ 54.0 |  |  |
Total requested amount |  |  |  | 55.0 |  |  |  |
CECONY | Steam | Year 3 |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  | 4.0 | 49.0 |  |  |
Total requested amount |  |  |  | $ 53.0 |  |  |  |
CECONY | Steam | Subsidiaries |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Return on common equity (as a percent) |  |  | 9.00% |  |  |  |  |
Common equity ratio (percent) |  |  | 48.00% |  |  |  |  |
CECONY | Electric and Gas Transmission Projects | Subsidiaries |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Rate plan, term (in years) |  |  |  | 3 years |  |  |  |
CECONY | NYSPSC | Steam |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  | $ 137.0 |  |  |
Return on common equity (as a percent) |  |  |  |  | 10.00% |  |  |
Common equity ratio (percent) |  |  |  |  | 50.00% |  |  |
RECO | Electric |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount | $ 16.9 |  |  |  |  | $ 20.4 |  |
Common equity ratio (percent) |  |  |  |  |  | 47.00% |  |
Return on common equity (percent) |  |  |  |  |  | 11.04% |  |
O&R | Subsequent Event |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Federal grants applied for |  |  |  |  |  |  | $ 125.0 |

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