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Regulatory Matters - Regulatory Assets (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Jan. 01, 2024 | Dec. 31, 2023 | Jan. 01, 2022
--- | --- | --- | --- | ---
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | $ 5,317 |  | $ 4,607 |
Regulatory assets – current | 224 |  | 281 |
Total Regulatory Assets | 5,541 |  | 4,888 |
System peak reduction and energy efficiency programs |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 1,204 |  | 1,095 |
Environmental remediation costs |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 1,093 |  | 1,105 |
COVID - 19 pandemic deferrals |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 888 |  | 789 |
Revenue taxes |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 525 |  | 476 |
Legacy meters |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 420 |  | 17 |
Property tax reconciliation |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 176 |  | 169 |
Deferred storm costs |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 169 |  | 206 |
Deferred derivative losses - long term |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 154 |  | 163 |
Electric vehicle make ready |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 115 |  | 73 |
MTA power reliability deferral |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 38 |  | 61 |
Gas service line deferred costs |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 23 |  | 43 |
Unrecognized pension and other postretirement costs |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 10 |  | 0 |
Pension and other postretirement benefits deferrals |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 5 |  | 48 |
Other |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 497 |  | 362 |
Deferred derivative losses - short term |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – current | 165 |  | 269 |
Recoverable energy costs |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – current | 59 |  | 12 |
CECONY |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 4,971 |  | 4,314 |
Regulatory assets – current | 193 |  | 254 |
CECONY | Subsidiaries |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 4,971 |  | 4,314 |
Regulatory assets – current | 193 |  | 254 |
Total Regulatory Assets | 5,164 |  | 4,568 |
CECONY | System peak reduction and energy efficiency programs | Subsidiaries |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 1,172 |  | 1,075 |
CECONY | Environmental remediation costs | Subsidiaries |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 1,010 |  | 1,022 |
CECONY | COVID - 19 pandemic deferrals | Subsidiaries |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 875 |  | 782 |
CECONY | Revenue taxes | Subsidiaries |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 503 |  | 455 |
CECONY | Legacy meters | Subsidiaries |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 405 |  | 0 |
CECONY | Property tax reconciliation | Subsidiaries |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 176 |  | 169 |
CECONY | Deferred storm costs | Subsidiaries |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 67 |  | 115 |
CECONY | Deferred derivative losses - long term | Subsidiaries |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 138 |  | 148 |
CECONY | Electric vehicle make ready | Subsidiaries |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 105 |  | 68 |
CECONY | MTA power reliability deferral | Subsidiaries |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 38 |  | 61 |
CECONY | Gas service line deferred costs | Subsidiaries |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 23 |  | 43 |
CECONY | Unrecognized pension and other postretirement costs | Subsidiaries |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 10 |  | 0 |
CECONY | Pension and other postretirement benefits deferrals | Subsidiaries |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 5 |  | 39 |
CECONY | Other | Subsidiaries |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – noncurrent | 444 |  | 337 |
CECONY | Deferred derivative losses - short term | Subsidiaries |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – current | 151 |  | 253 |
CECONY | Recoverable energy costs | Subsidiaries |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets – current | $ 42 |  | $ 1 |
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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