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Regulatory Matters - Utility Rate Narrative (Details) $ in Thousands |  |  |  | 1 Months Ended | 12 Months Ended | 23 Months Ended | 35 Months Ended | 36 Months Ended
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Feb. 15, 2023 | Jan. 01, 2022 USD ($) | Dec. 31, 2021 USD ($) | Feb. 28, 2023 USD ($) | Dec. 31, 2022 USD ($) | Nov. 30, 2022 USD ($) | Apr. 30, 2022 | Jan. 31, 2022 USD ($) | Jul. 31, 2021 | Dec. 31, 2023 USD ($) substation | Dec. 31, 2022 | Dec. 31, 2021 | Jan. 31, 2020 | Dec. 31, 2025 | Dec. 31, 2024 USD ($) | Dec. 31, 2021 USD ($)
Scenario, Forecast | Eastern Queens Reliability Project | Substation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated cost of substations |  |  |  |  |  |  |  |  |  | $ 1,100,000 |  |  |  |  |  |
CECONY | Scenario, Forecast | Eastern Queens Reliability Project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of substations | substation |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Minimum number of days after adoption of the join proposal to petition |  |  |  |  |  |  |  |  |  | 30 days |  |  |  |  |  |
RECO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common equity ratio (percent) |  |  |  |  |  |  |  | 48.51% |  |  |  | 48.32% | 49.70% |  |  |
RECO | New Jersey Board of Public Utilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment plan |  |  |  |  | $ 47,800 |  |  |  |  |  |  |  |  |  |  |
Investment plan, term (in years) |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |
Electric | CECONY |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common equity ratio (percent) |  |  |  |  |  |  |  |  |  |  | 48.00% |  |  |  |  |
Electric | CECONY | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common equity ratio (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 48.00% |  |
Electric | RECO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  | $ 16,900 |  |  |  |  | $ 20,400 |  |  |  |  |  |  |  |
Return on common equity (percent) |  |  |  |  |  |  |  | 11.04% | 0.50% |  |  |  |  |  |  |
Electric | RECO | New Jersey Board of Public Utilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  | $ 9,650 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric | O&R |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common equity ratio (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48.00%
Electric | O&R | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common equity ratio (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48.00% |
Steam | CECONY |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Return on common equity (percent) |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |
Common equity ratio (percent) |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |
Deviation of inflation rate and revenue requirement (in basis points) |  |  |  |  |  | 50 |  |  |  |  |  |  |  |  |  |
Steam | CECONY | NYSPSC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  | $ 137,000 |  |  |  |  |  |  |  |  |  |
Return on common equity (percent) |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |
Common equity ratio (percent) |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |
Electric and Gas Transmission Projects | O&R | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utility, rate plan term (in years) |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |
Electric and Gas Transmission Projects | O&R | Subsidiaries | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utility, rate plan term (in years) | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate Plan for Year 1 | Electric | O&R |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,600
Rate Plan for Year 1 | Electric | O&R | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,700 |
Rate Plan for Year 1 | Steam | CECONY | Subsequent Event | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  | $ 4,000 |  |  |  |  |  |  |  |  |  |  |  |
Total requested amount |  |  |  | 141,000 |  |  |  |  |  |  |  |  |  |  |  |
Rate Plan for Year 2 | Electric | O&R |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,100
Rate Plan for Year 2 | Electric | O&R | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,700 |
Rate Plan for Year 2 | Steam | CECONY |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  | $ 54,000 |  |  |  |  |  |  |  |  |  |
Rate Plan for Year 2 | Steam | CECONY | Subsequent Event | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  | 1,000 |  |  |  |  |  |  |  |  |  |  |  |
Total requested amount |  |  |  | 55,000 |  |  |  |  |  |  |  |  |  |  |  |
Rate Plan for Year 3 | Electric | O&R |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,200
Rate Plan for Year 3 | Electric | O&R | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,700 |
Rate Plan for Year 3 | Steam | CECONY |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  | $ 49,000 |  |  |  |  |  |  |  |  |  |
Rate Plan for Year 3 | Steam | CECONY | Subsequent Event | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  | 4,000 |  |  |  |  |  |  |  |  |  |  |  |
Total requested amount |  |  |  | $ 53,000 |  |  |  |  |  |  |  |  |  |  |  |

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