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Regulatory Matters - Utility Rate Narrative and RECO Narrative (Details) $ in Thousands |  |  |  |  | 1 Months Ended | 12 Months Ended | 36 Months Ended |  |  |
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Jan. 01, 2024 USD ($) | Aug. 30, 2022 USD ($) | Jan. 01, 2022 USD ($) | Dec. 31, 2021 USD ($) | Jan. 31, 2025 USD ($) | Mar. 31, 2024 USD ($) | Jan. 31, 2024 | Aug. 31, 2023 USD ($) substation | Dec. 31, 2022 USD ($) | Jan. 31, 2022 | Dec. 31, 2028 USD ($) | Dec. 31, 2027 USD ($) | Dec. 31, 2027 | Dec. 31, 2025 | Dec. 31, 2024 USD ($) | Dec. 31, 2022 | Nov. 24, 2024 USD ($) | May 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
Eastern Queens Reliability Project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated cost of substations |  |  |  |  |  |  |  | $ 1,200,000 |  |  |  |  |  |  |  |  |  |  |
CECONY |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000 |  |  |  |
Bill relief program, amount received |  |  |  |  |  | $ 91,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, billing system costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 510,000 |  |  |  |
Public utilities, requested capitalization of billing system costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 89,000 |  |  |  |
Public Utilities, Incremental Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 51,000 |
Net regulatory assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,078,000 |  |  |  | $ 1,113,000
Number of substations | substation |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |
CECONY | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, limit for capitalization |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 421,000 |  |  | $ 421,000 | 38,000
CECONY | Electric |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized return on common equity (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.80% |  |  |
Common equity ratio (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48.00% |  |  |
CECONY | Electric | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized return on common equity (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 925.00% |  |  |  |  |
Common equity ratio (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 48.00% |  |  |  |  |
RECO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized return on common equity (percent) |  |  |  |  |  |  |  |  |  | 9.60% |  |  |  |  |  |  |  |  |
Common equity ratio (percent) |  |  |  |  |  |  |  |  |  | 48.51% |  |  |  |  |  |  |  |  |
RECO | New Jersey Board of Public Utilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment plan |  |  |  |  |  |  |  |  | $ 47,800 |  |  |  |  |  |  |  |  |  |
Investment plan, term (in years) |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |
Defer incremental preparation costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000 |  |
RECO | Electric |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount | $ 20,700 | $ 18,200 |  | $ 16,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
RECO | Electric | New Jersey Board of Public Utilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  | $ 9,650 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
O&R |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bill relief program, amount received |  |  |  |  |  | $ 9,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Net regulatory assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,000 |  |  |  | $ 18,000
O&R | Electric |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized return on common equity (percent) |  |  |  |  |  |  | 10.10% |  |  |  |  |  |  |  |  |  |  |  |
Common equity ratio (percent) |  |  |  |  |  |  | 48.00% |  |  |  |  |  |  |  | 48.00% |  |  |  |
O&R | Electric | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  | $ 1,612,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized return on common equity (percent) |  |  |  |  | 10.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common equity ratio (percent) |  |  |  |  | 4800.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
O&R | Electric | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  |  |  |  |  |  | $ 880,000 | $ 932,000 |  |  |  |  |  |  |
Common equity ratio (percent) |  |  |  |  |  |  |  |  |  |  |  |  | 48.00% |  |  |  |  |  |

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