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Regulatory Matters - Regulatory Assets (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | $ 3,639 | $ 6,195
Regulatory assets – current | 206 | 266
Total Regulatory Assets | 3,845 | 6,461
Regulatory assets not earning return | 1,883 | 4,823
Unrecognized pension and other postretirement costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 128 | 3,241
Regulatory assets not earning return | 128 | 3,241
Environmental remediation costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 938 | 865
Regulatory assets not earning return | 928 | 855
Revenue taxes |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 395 | 356
Regulatory assets not earning return | 375 | 336
Pension and other postretirement benefits deferrals |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 496 | 315
Property tax reconciliation |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 202 | 241
Deferred storm costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 276 | 195
MTA power reliability deferral |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 140 | 188
System peak reduction and energy efficiency programs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 285 | 124
Deferred derivative losses |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 51 | 120
Regulatory assets not earning return | 51 | 120
COVID - 19 Deferrals |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 282 | 115
Municipal infrastructure support costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 44 | 62
Brooklyn Queens demand management program |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 36 | 36
Meadowlands heater odorization project |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 29 | 32
Gate station upgrade project |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 14 | 25
Unamortized loss on reacquired debt |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 16 | 21
Preferred stock redemption |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 20 | 21
Recoverable REV demonstration project costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 16 | 20
Non-wire alternative projects |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 23 | 18
COVID-19 Deferral for Uncollectible Accounts Receivable |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 236 | 57
Other |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 248 | 200
Regulatory assets not earning return | 24 | 24
Deferred derivative losses |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – current | 141 | 190
Regulatory assets not earning return | 141 | 190
Recoverable energy costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – current | 65 | 76
CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 3,316 | 5,745
Regulatory assets – current | 188 | 244
Total Regulatory Assets | 3,504 | 5,989
Regulatory assets not earning return | 1,753 | 4,536
CECONY | Unrecognized pension and other postretirement costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 110 | 3,065
Regulatory assets not earning return | 110 | 3,065
CECONY | Environmental remediation costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 860 | 791
Regulatory assets not earning return | 850 | 781
CECONY | Revenue taxes |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 378 | 342
Regulatory assets not earning return | 359 | 323
CECONY | Pension and other postretirement benefits deferrals |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 435 | 272
CECONY | Property tax reconciliation |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 202 | 239
CECONY | Deferred storm costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 158 | 83
CECONY | MTA power reliability deferral |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 140 | 188
CECONY | System peak reduction and energy efficiency programs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 284 | 124
CECONY | Deferred derivative losses |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 45 | 111
Regulatory assets not earning return | 45 | 111
CECONY | COVID - 19 Deferrals |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 277 | 113
CECONY | Municipal infrastructure support costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 44 | 62
CECONY | Brooklyn Queens demand management program |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 36 | 36
CECONY | Meadowlands heater odorization project |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 29 | 32
CECONY | Gate station upgrade project |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 14 | 25
CECONY | Unamortized loss on reacquired debt |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 14 | 19
CECONY | Preferred stock redemption |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 20 | 21
CECONY | Recoverable REV demonstration project costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 15 | 18
CECONY | Non-wire alternative projects |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 23 | 18
CECONY | COVID-19 Deferral for Uncollectible Accounts Receivable |  |
Regulatory Assets [Line Items] |  |
Regulatory assets not earning return | 231 | 55
CECONY | Other |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 232 | 186
Regulatory assets not earning return | 24 | 24
CECONY | Deferred derivative losses |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – current | 133 | 177
Regulatory assets not earning return | 134 | 177
CECONY | Recoverable energy costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – current | $ 55 | $ 67

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