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Regulatory Matters - Regulatory Assets (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | $ 5,990 | $ 6,195
Regulatory assets – current | 253 | 266
Total Regulatory Assets | 6,243 | 6,461
Regulatory assets not earning return | 4,458 | 4,766
Unrecognized pension and other postretirement costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 2,943 | 3,241
Regulatory assets not earning return | 2,943 | 3,241
Environmental remediation costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 858 | 865
Regulatory assets not earning return | 847 | 855
Revenue taxes |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 369 | 356
Regulatory assets not earning return | 350 | 336
Property tax reconciliation |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 244 | 241
Pension and other postretirement benefits deferrals |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 365 | 315
MTA power reliability deferral |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 176 | 188
Deferred derivative losses |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 97 | 120
Regulatory assets not earning return | 97 | 120
System peak reduction and energy efficiency programs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 106 | 124
Municipal infrastructure support costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 56 | 62
COVID-19 pandemic deferrals |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 142 | 115
Deferred storm costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 238 | 195
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 | 32 | 32
Gate station upgrade project |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 18 | 25
Unamortized loss on reacquired debt |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 19 | 21
Recoverable REV demonstration project costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 18 | 20
Preferred stock redemption |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 21 | 21
Non-wire alternative projects |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 19 | 18
Other |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 233 | 200
Regulatory assets not earning return | 35 | 24
Deferred derivative losses |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – current | 186 | 190
Regulatory assets not earning return | 186 | 190
Recoverable energy costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – current | 67 | 76
CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 5,559 | 5,745
Regulatory assets – current | 234 | 244
Total Regulatory Assets | 5,793 | 5,989
Regulatory assets not earning return | 4,203 | 4,481
CECONY | Unrecognized pension and other postretirement costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 2,791 | 3,065
Regulatory assets not earning return | 2,791 | 3,065
CECONY | Environmental remediation costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 786 | 791
Regulatory assets not earning return | 776 | 781
CECONY | Revenue taxes |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 353 | 342
Regulatory assets not earning return | 336 | 323
CECONY | Property tax reconciliation |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 243 | 239
CECONY | Pension and other postretirement benefits deferrals |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 318 | 272
CECONY | MTA power reliability deferral |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 176 | 188
CECONY | Deferred derivative losses |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 91 | 111
Regulatory assets not earning return | 91 | 111
CECONY | System peak reduction and energy efficiency programs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 105 | 124
CECONY | Municipal infrastructure support costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 56 | 62
CECONY | COVID-19 pandemic deferrals |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 139 | 113
CECONY | Deferred storm costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 119 | 83
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 | 32 | 32
CECONY | Gate station upgrade project |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 18 | 25
CECONY | Unamortized loss on reacquired debt |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 18 | 19
CECONY | Recoverable REV demonstration project costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 17 | 18
CECONY | Preferred stock redemption |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 21 | 21
CECONY | Non-wire alternative projects |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 19 | 18
CECONY | Other |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 221 | 186
Regulatory assets not earning return | 35 | 24
CECONY | Deferred derivative losses |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – current | 174 | 177
Regulatory assets not earning return | 174 | 177
CECONY | Recoverable energy costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – current | $ 60 | $ 67

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