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Regulatory Matters - Rate Plans (Details) - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2021 | Jan. 31, 2025 | Jan. 31, 2024 | Jan. 31, 2023 | May 31, 2022 | Apr. 30, 2022 | Mar. 31, 2022 | Jan. 31, 2022 | Oct. 31, 2021 | Jul. 31, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  | $ 4,165.0 | $ 3,613.0 | $ 11,639.0 | $ 10,261.0 |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  | $ 3,549.0 | $ 3,092.0 | 9,972.0 | $ 8,784.0 |
CECONY | Electric | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  | $ 278.0 |  |  |  |  |  |  |  |  |  |
Return on common equity (as a percent) |  |  |  |  | 8.80% |  |  |  |  |  |  |  |  |  |
Common equity ratio (percent) |  |  |  |  | 48.00% |  |  |  |  |  |  |  |  |  |
CECONY | Electric | Subsidiaries | Year 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in requested rate increase (decrease), amount |  |  |  |  |  | $ 161.0 |  |  |  |  |  |  |  |  |
CECONY | Electric | Subsidiaries | Year 1 | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  | $ 1,038.0 |  |  |  |  |  |  |  |  |  |  |
CECONY | Electric | Subsidiaries | Year 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in requested rate increase (decrease), amount |  |  |  |  |  | 109.0 |  |  |  |  |  |  |  |  |
CECONY | Electric | Subsidiaries | Year 2 | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  | $ 744.0 |  |  |  |  |  |  |  |  |  |  |  |
CECONY | Electric | Subsidiaries | Year 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in requested rate increase (decrease), amount |  |  |  |  |  | 7.0 |  |  |  |  |  |  |  |  |
CECONY | Electric | Subsidiaries | Year 3 | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  | $ 615.0 |  |  |  |  |  |  |  |  |  |  |  |  |
CECONY | Gas | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  | $ 164.0 |  |  |  |  |  |  |  |  |  |
Return on common equity (as a percent) |  |  |  |  | 8.80% |  |  |  |  |  |  |  |  |  |
Common equity ratio (percent) |  |  |  |  | 48.00% |  |  |  |  |  |  |  |  |  |
CECONY | Gas | Subsidiaries | Year 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in requested rate increase (decrease), amount |  |  |  |  |  | 101.0 |  |  |  |  |  |  |  |  |
CECONY | Gas | Subsidiaries | Year 1 | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  | $ 402.0 |  |  |  |  |  |  |  |  |  |  |
CECONY | Gas | Subsidiaries | Year 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in requested rate increase (decrease), amount |  |  |  |  |  | 29.0 |  |  |  |  |  |  |  |  |
CECONY | Gas | Subsidiaries | Year 2 | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  | $ 205.0 |  |  |  |  |  |  |  |  |  |  |  |
CECONY | Gas | Subsidiaries | Year 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in requested rate increase (decrease), amount |  |  |  |  |  | 42.0 |  |  |  |  |  |  |  |  |
CECONY | Gas | Subsidiaries | Year 3 | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  | $ 176.0 |  |  |  |  |  |  |  |  |  |  |  |  |
CECONY | Electric and Gas Transmission Projects | Subsidiaries | Earnings Adjustment Mechanisms (EAMs) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  | $ (4.9) |  | $ 92.0
O&R | Electric | Year 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  | 4.9 |  |  |  |  |  |  |  |  |
O&R | Electric | Year 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  | 16.2 |  |  |  |  |  |  |  |  |
O&R | Electric | Year 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  | 23.1 |  |  |  |  |  |  |  |  |
O&R | Electric | Levelized Annual Basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  | 11.7 |  |  |  |  |  |  |  |  |
O&R | Gas | Year 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  | 0.7 |  |  |  |  |  |  |  |  |
O&R | Gas | Year 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  | 7.4 |  |  |  |  |  |  |  |  |
O&R | Gas | Year 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  | 9.9 |  |  |  |  |  |  |  |  |
O&R | Gas | Levelized Annual Basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  | $ 4.4 |  |  |  |  |  |  |  |  |
O&R | Electric and Gas Transmission Projects |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recovery period of late payment charges |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |
Recovery of late payment charges, amount |  |  |  |  |  |  |  |  | $ 2.8 |  |  |  |  |  |
Recovery of late payment charges, return on equity threshold rate |  |  |  |  |  |  |  |  | 0.05% |  |  |  |  |  |
RECO | Electric |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount | $ 16.9 |  |  |  |  |  |  | $ 20.4 |  |  |  |  |  |  |
Return on common equity (percent) |  |  |  |  |  |  |  | 11.04% |  | 0.50% |  |  |  |  |
Common equity ratio percentage |  |  |  |  |  |  |  | 47.00% |  |  |  |  |  |  |
RECO | NJBPU |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Infrastructure investment plan |  |  |  |  |  |  | $ 209.0 |  |  |  |  |  |  |  |
Infrastructure investment plan period (in years) |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |

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