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Regulatory Matters - Regulatory Assets (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | $ 6,195 | $ 4,859
Regulatory assets – current | 266 | 128
Total Regulatory Assets | 6,461 | 4,987
Regulatory assets not earning return | 4,766 | 3,799
Unrecognized pension and other postretirement costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 3,241 | 2,541
Regulatory assets not earning return | 3,241 | 2,541
Environmental remediation costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 865 | 732
Regulatory assets not earning return | 855 | 727
Revenue taxes |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 356 | 321
Regulatory assets not earning return | 336 | 296
Pension and other postretirement benefits deferrals |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 315 | 71
Property tax reconciliation |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 241 | 219
Deferred storm costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 195 | 77
MTA power reliability deferral |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 188 | 248
System peak reduction and energy efficiency programs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 124 | 131
Deferred derivative losses |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 120 | 83
Regulatory assets not earning return | 120 | 83
COVID - 19 Deferrals |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 115 | 0
Municipal infrastructure support costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 62 | 75
Brooklyn Queens demand management program |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 36 | 39
Meadowlands heater odorization project |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 32 | 35
Gate station upgrade project |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 25 | 19
Unamortized loss on reacquired debt |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 21 | 28
Preferred stock redemption |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 21 | 22
Recoverable REV demonstration project costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 20 | 21
Non-wire alternative projects |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 18 | 14
Workers’ compensation |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 0 | 3
Regulatory assets not earning return | 0 | 3
Other |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 200 | 180
Regulatory assets not earning return | 24 | 21
Deferred derivative losses |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – current | 190 | 128
Regulatory assets not earning return | 190 | 128
Recoverable energy costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – current | 76 | 0
CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 5,745 | 4,487
Regulatory assets – current | 244 | 113
Total Regulatory Assets | 5,989 | 4,600
Regulatory assets not earning return | 4,481 | 3,546
CECONY | Unrecognized pension and other postretirement costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 3,065 | 2,403
Regulatory assets not earning return | 3,065 | 2,403
CECONY | Environmental remediation costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 791 | 647
Regulatory assets not earning return | 781 | 647
CECONY | Revenue taxes |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 342 | 308
Regulatory assets not earning return | 323 | 285
CECONY | Pension and other postretirement benefits deferrals |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 272 | 47
CECONY | Property tax reconciliation |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 239 | 210
CECONY | Deferred storm costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 83 | 0
CECONY | MTA power reliability deferral |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 188 | 248
CECONY | System peak reduction and energy efficiency programs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 124 | 130
CECONY | Deferred derivative losses |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 111 | 76
Regulatory assets not earning return | 111 | 76
CECONY | COVID - 19 Deferrals |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 113 | 0
CECONY | Municipal infrastructure support costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 62 | 75
CECONY | Brooklyn Queens demand management program |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 36 | 39
CECONY | Meadowlands heater odorization project |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 32 | 35
CECONY | Gate station upgrade project |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 25 | 19
CECONY | Unamortized loss on reacquired debt |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 19 | 26
CECONY | Preferred stock redemption |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 21 | 22
CECONY | Recoverable REV demonstration project costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 18 | 19
CECONY | Non-wire alternative projects |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 18 | 14
CECONY | Workers’ compensation |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 0 | 3
Regulatory assets not earning return | 0 | 3
CECONY | Other |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 186 | 166
Regulatory assets not earning return | 24 | 20
CECONY | Deferred derivative losses |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – current | 177 | 113
Regulatory assets not earning return | 177 | 112
CECONY | Recoverable energy costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – current | $ 67 | $ 0

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