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Regulatory Matters - Regulatory Assets (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | $ 5,903 | $ 6,195
Regulatory assets – current | 205 | 266
Total Regulatory Assets | 6,108 | 6,461
Regulatory assets not earning return | 4,081 | 4,766
Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 5,473 | 5,745
Regulatory assets – current | 187 | 244
Unrecognized pension and other postretirement costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 2,527 | 3,241
Regulatory assets not earning return | 2,527 | 3,241
Environmental remediation costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 846 | 865
Regulatory assets not earning return | 832 | 855
Pension and other postretirement benefits deferrals |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 438 | 315
Revenue taxes |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 385 | 356
Regulatory assets not earning return | 364 | 336
Property tax reconciliation |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 245 | 241
COVID-19 pandemic deferrals |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 274 | 115
Deferred storm costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 277 | 195
MTA power reliability deferral |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 152 | 188
System peak reduction and energy efficiency programs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 145 | 124
Deferred derivative losses - long term |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 136 | 120
Regulatory assets not earning return | 136 | 120
Municipal infrastructure support costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 49 | 62
Brooklyn Queens demand management program |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 35 | 36
Meadowlands heater odorization project |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 30 | 32
Preferred stock redemption |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 20 | 21
Non-wire alternative projects |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 23 | 18
Unamortized loss on reacquired debt |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 17 | 21
Recoverable REV demonstration project costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 15 | 20
Gate station upgrade project |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 15 | 25
Other |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 274 | 200
Regulatory assets not earning return | 56 | 24
Deferred derivative losses - short term |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – current | 166 | 190
Regulatory assets not earning return | 166 | 190
Recoverable energy costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – current | 39 | 76
CECONY | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 5,473 | 5,745
Regulatory assets – current | 187 | 244
Total Regulatory Assets | 5,660 | 5,989
Regulatory assets not earning return | 3,843 | 4,481
CECONY | Unrecognized pension and other postretirement costs | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 2,394 | 3,065
Regulatory assets not earning return | 2,394 | 3,065
CECONY | Environmental remediation costs | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 780 | 791
Regulatory assets not earning return | 765 | 781
CECONY | Pension and other postretirement benefits deferrals | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 382 | 272
CECONY | Revenue taxes | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 369 | 342
Regulatory assets not earning return | 349 | 323
CECONY | Property tax reconciliation | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 245 | 239
CECONY | COVID-19 pandemic deferrals | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 269 | 113
CECONY | Deferred storm costs | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 155 | 83
CECONY | MTA power reliability deferral | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 152 | 188
CECONY | System peak reduction and energy efficiency programs | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 145 | 124
CECONY | Deferred derivative losses - long term | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 124 | 111
Regulatory assets not earning return | 124 | 111
CECONY | Municipal infrastructure support costs | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 49 | 62
CECONY | Brooklyn Queens demand management program | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 35 | 36
CECONY | Meadowlands heater odorization project | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 30 | 32
CECONY | Preferred stock redemption | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 20 | 21
CECONY | Non-wire alternative projects | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 23 | 18
CECONY | Unamortized loss on reacquired debt | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 15 | 19
CECONY | Recoverable REV demonstration project costs | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 14 | 18
CECONY | Gate station upgrade project | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 15 | 25
CECONY | Other | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 257 | 186
Regulatory assets not earning return | 56 | 24
CECONY | Deferred derivative losses - short term | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – current | 155 | 177
Regulatory assets not earning return | 155 | 177
CECONY | Recoverable energy costs | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – current | $ 32 | $ 67

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