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Regulatory Matters - Regulatory Assets (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024 | Jan. 01, 2024 | Jan. 01, 2022
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Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | $ 5,554.0 | $ 5,523.0 |  |
Regulatory assets – current | 118.0 | 141.0 |  |
Total Regulatory Assets | 5,672.0 | 5,664.0 |  |
Energy efficiency and other clean energy programs |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 1,772.0 | 1,675.0 |  |
Customer account deferrals |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 1,178.0 | 1,073.0 |  |
Environmental investigation and remediation costs |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 1,024.0 | 1,038.0 |  |
Revenue taxes |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 616.0 | 540.0 |  |
Legacy meters |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 390.0 | 413.0 |  |
Property tax reconciliation |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 111.0 | 131.0 |  |
Deferred storm costs |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 88.0 | 147.0 |  |
Deferred derivative losses - long term |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 64.0 | 106.0 |  |
Unrecognized pension and other postretirement costs |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 21.0 | 0.0 |  |
MTA power reliability deferral |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 8.0 | 31.0 |  |
Pension and other postretirement benefits deferrals |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 0.0 | 2.0 |  |
Other |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 282.0 | 367.0 |  |
Deferred derivative losses - short term |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – current | 116.0 | 102.0 |  |
Recoverable energy costs |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – current | 2.0 | 39.0 |  |
CECONY |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 5,197.0 | 5,158.0 |  |
Regulatory assets – current | 110.0 | 106.0 |  |
CECONY | Subsidiaries |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 5,197.0 | 5,158.0 |  |
Regulatory assets – current | 110.0 | 106.0 |  |
Total Regulatory Assets | 5,307.0 | 5,264.0 |  |
CECONY | Energy efficiency and other clean energy programs | Subsidiaries |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 1,680.0 | 1,601.0 |  |
CECONY | Customer account deferrals | Subsidiaries |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 1,169.0 | 1,058.0 |  |
CECONY | Environmental investigation and remediation costs | Subsidiaries |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 937.0 | 952.0 |  |
CECONY | Revenue taxes | Subsidiaries |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 589.0 | 517.0 |  |
CECONY | Legacy meters | Subsidiaries |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 377.0 | 398.0 |  |
CECONY | Property tax reconciliation | Subsidiaries |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 109.0 | 131.0 |  |
CECONY | Deferred storm costs | Subsidiaries |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 10.0 | 53.0 |  |
CECONY | Deferred derivative losses - long term | Subsidiaries |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 57.0 | 94.0 |  |
CECONY | Unrecognized pension and other postretirement costs | Subsidiaries |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 13.0 | 0.0 |  |
CECONY | MTA power reliability deferral | Subsidiaries |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 8.0 | 31.0 |  |
CECONY | Pension and other postretirement benefits deferrals | Subsidiaries |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 0.0 | 2.0 |  |
CECONY | Other | Subsidiaries |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 248.0 | 321.0 |  |
CECONY | Deferred derivative losses - short term | Subsidiaries |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – current | 108.0 | 92.0 |  |
CECONY | Recoverable energy costs | Subsidiaries |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – current | 2.0 | 14.0 |  |
CECONY | Arrears Relief Program Deferral |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 279.3 | 323.7 |  |
O&R | Arrears Relief Program Deferral |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | $ 1.2 | $ 1.4 |  |
Consolidated Edison Company of New York, Inc. And Orange And Rockland | Legacy meters |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Cost of the program, recovery period (in years) |  |  | 15 years | 12 years

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