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Regulatory Matters - Regulatory Assets (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | $ 4,224 | $ 3,974
Regulatory assets – current | 190 | 305
Total Regulatory Assets | 4,414 | 4,279
Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 3,944 | 3,669
Regulatory assets – current | 173 | 286
Unrecognized pension and other postretirement costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 123 | 78
Environmental remediation costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 985 | 991
Revenue taxes |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 454 | 436
Deferred storm costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 239 | 270
Municipal infrastructure support costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 9 | 29
Brooklyn Queens demand management program |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 31 | 33
Meadowlands heater odorization project |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 25 | 27
Recoverable Demonstration project costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 18 | 17
Gate station upgrade project |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 14 | 14
System peak reduction and energy efficiency programs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 832 | 783
Unamortized loss on reacquired debt |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 9 | 11
Deferred derivative losses - long term |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 65 | 31
Property tax reconciliation |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 146 | 121
Legacy meters |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 18 | 20
Gas service line deferred costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 54 | 99
COVID - 19 customer arrears relief programs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 433 | 104
Pension and other postretirement benefits deferrals |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 116 | 279
Preferred stock redemption |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 19 | 19
MTA power reliability deferral |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 77 | 92
Non-wire alternative projects |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 20 | 22
COVID - 19 pandemic deferrals |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 285 | 292
Electric vehicle make ready |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 50 | 33
Other |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 202 | 173
Deferred derivative losses - short term |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – current | 159 | 184
Recoverable energy costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – current | 31 | 121
CECONY | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 3,944 | 3,669
Regulatory assets – current | 173 | 286
Total Regulatory Assets | 4,117 | 3,955
CECONY | Unrecognized pension and other postretirement costs | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 123 | 78
CECONY | Environmental remediation costs | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 900 | 906
CECONY | Revenue taxes | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 434 | 417
CECONY | Deferred storm costs | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 143 | 173
CECONY | Municipal infrastructure support costs | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 9 | 29
CECONY | Brooklyn Queens demand management program | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 31 | 33
CECONY | Meadowlands heater odorization project | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 25 | 27
CECONY | Recoverable Demonstration project costs | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 17 | 16
CECONY | Gate station upgrade project | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 14 | 14
CECONY | System peak reduction and energy efficiency programs | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 825 | 780
CECONY | Unamortized loss on reacquired debt | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 8 | 10
CECONY | Deferred derivative losses - long term | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 60 | 26
CECONY | Property tax reconciliation | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 146 | 121
CECONY | Legacy meters | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 0 | 0
CECONY | Gas service line deferred costs | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 54 | 99
CECONY | COVID - 19 customer arrears relief programs | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 430 | 101
CECONY | Pension and other postretirement benefits deferrals | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 93 | 240
CECONY | Preferred stock redemption | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 19 | 19
CECONY | MTA power reliability deferral | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 77 | 92
CECONY | Non-wire alternative projects | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 20 | 22
CECONY | COVID - 19 pandemic deferrals | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 281 | 288
CECONY | Electric vehicle make ready | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 45 | 30
CECONY | Other | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 190 | 148
CECONY | Deferred derivative losses - short term | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – current | 153 | 178
CECONY | Recoverable energy costs | Subsidiaries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – current | $ 20 | $ 108

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