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Regulatory Matters - Regulatory Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | $ 4,379 | $ 4,513
Regulatory liabilities – current | 490 | 36
Total Regulatory Liabilities | 4,869 | 4,549
Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 3,941 | 4,094
Regulatory liabilities – current | 428 | 11
Future income tax |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 2,040 | 2,207
Allowance for cost of removal less salvage |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 1,114 | 1,090
Net unbilled revenue deferrals |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 184 | 198
TCJA net benefits |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 167 | 295
Net proceeds from sale of property |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 111 | 137
Deferred derivative gains - long term |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 110 | 5
Pension and other postretirement benefit deferrals |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 98 | 85
System benefit charge carrying charge |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 71 | 64
Energy efficiency portfolio standard unencumbered funds |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 17 | 1
Property tax refunds |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 35 | 36
BQDM and REV Demo reconciliations |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 26 | 27
Sales and use tax refunds |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 18 | 16
Earnings sharing - electric, gas and steam |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 13 | 15
Unrecognized other postretirement costs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 12 | 11
Settlement of gas proceedings |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 11 | 21
Settlement of prudence proceeding |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 6 | 5
Workers' compensation |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 5 | 3
Other |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 341 | 297
Deferred derivative gains - short term |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – current | 451 | 8
Refundable energy costs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – current | 31 | 28
Revenue decoupling mechanism |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – current | 8 | 0
CECONY | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 3,941 | 4,094
Regulatory liabilities – current | 428 | 11
Total Regulatory Liabilities | 4,369 | 4,105
CECONY | Future income tax | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 1,896 | 2,062
CECONY | Allowance for cost of removal less salvage | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 950 | 932
CECONY | Net unbilled revenue deferrals | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 184 | 198
CECONY | TCJA net benefits | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 164 | 286
CECONY | Net proceeds from sale of property | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 111 | 137
CECONY | Deferred derivative gains - long term | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 101 | 4
CECONY | Pension and other postretirement benefit deferrals | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 53 | 46
CECONY | System benefit charge carrying charge | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 63 | 57
CECONY | Energy efficiency portfolio standard unencumbered funds | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 19 | 0
CECONY | Property tax refunds | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 35 | 35
CECONY | BQDM and REV Demo reconciliations | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 22 | 25
CECONY | Sales and use tax refunds | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 17 | 16
CECONY | Earnings sharing - electric, gas and steam | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 10 | 10
CECONY | Unrecognized other postretirement costs | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 0 | 0
CECONY | Settlement of gas proceedings | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 11 | 21
CECONY | Settlement of prudence proceeding | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 6 | 5
CECONY | Workers' compensation | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 5 | 3
CECONY | Other | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 294 | 257
CECONY | Deferred derivative gains - short term | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – current | 423 | 7
CECONY | Refundable energy costs | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – current | 5 | 4
CECONY | Revenue decoupling mechanism | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – current | $ 0 | $ 0

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