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Regulatory Matters - Regulatory Assets (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | $ 3,974 | $ 3,639
Regulatory assets – current | 305 | 206
Total Regulatory Assets | 4,279 | 3,845
Environmental remediation costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 991 | 938
System peak reduction and energy efficiency programs (h) |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 783 | 285
Revenue taxes |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 436 | 395
Pension and other postretirement benefits deferrals |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 279 | 496
COVID - 19 pandemic deferrals (f) |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 292 | 282
Deferred storm costs (c) |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 270 | 276
Property tax reconciliation (g) |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 121 | 202
Gas service line deferred costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 99 | 100
COVID - 19 arrears relief deferrals programs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 104 | 0
MTA power reliability deferral (b) |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 92 | 140
Unrecognized pension and other postretirement costs (a) |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 78 | 128
Brooklyn Queens demand management program |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 33 | 36
Deferred derivative losses - long term |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 31 | 51
Electric vehicle make ready (j) |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 33 | 8
Municipal infrastructure support costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 29 | 44
Meadowlands heater odorization project |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 27 | 29
Non-wire alternative projects |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 22 | 23
Legacy meters |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 20 | 2
Preferred stock redemption |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 19 | 20
Unamortized loss on reacquired debt |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 11 | 16
Recoverable Demonstration project costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 17 | 16
Gate station upgrade project |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 14 | 14
Other |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 173 | 138
Deferred derivative losses |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – current | 184 | 141
Recoverable energy costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – current | 121 | 65
CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 3,669 | 3,316
Regulatory assets – current | 286 | 188
CECONY | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 3,669 | 3,316
Regulatory assets – current | 286 | 188
Total Regulatory Assets | 3,955 | 3,504
CECONY | Environmental remediation costs | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 906 | 860
CECONY | System peak reduction and energy efficiency programs (h) | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 780 | 284
CECONY | Revenue taxes | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 417 | 378
CECONY | Pension and other postretirement benefits deferrals | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 240 | 435
CECONY | COVID - 19 pandemic deferrals (f) | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 288 | 277
CECONY | Deferred storm costs (c) | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 173 | 158
CECONY | Property tax reconciliation (g) | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 121 | 202
CECONY | Gas service line deferred costs | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 99 | 100
CECONY | COVID - 19 arrears relief deferrals programs | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 101 | 0
CECONY | MTA power reliability deferral (b) | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 92 | 140
CECONY | Unrecognized pension and other postretirement costs (a) | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 78 | 110
CECONY | Brooklyn Queens demand management program | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 33 | 36
CECONY | Deferred derivative losses - long term | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 26 | 45
CECONY | Electric vehicle make ready (j) | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 30 | 7
CECONY | Municipal infrastructure support costs | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 29 | 44
CECONY | Meadowlands heater odorization project | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 27 | 29
CECONY | Non-wire alternative projects | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 22 | 23
CECONY | Legacy meters | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 0 | 0
CECONY | Preferred stock redemption | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 19 | 20
CECONY | Unamortized loss on reacquired debt | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 10 | 14
CECONY | Recoverable Demonstration project costs | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 16 | 15
CECONY | Gate station upgrade project | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 14 | 14
CECONY | Other | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 148 | 125
CECONY | Deferred derivative losses | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – current | 178 | 133
CECONY | Recoverable energy costs | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – current | $ 108 | $ 55

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