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Regulatory Matters - Regulatory Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | $ 5,401 | $ 6,027
Regulatory liabilities – current | 189 | 374
Total Regulatory Liabilities | 5,590 | 6,401
Future income tax |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 1,583 | 1,753
Allowance for cost of removal less salvage |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 1,368 | 1,315
Net unbilled revenue deferrals |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 214 | 204
Energy efficiency portfolio standard unencumbered funds |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 5 | 5
Settlement of prudence proceeding |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 8 | 10
Earnings sharing - electric, gas and steam |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 13 | 13
System benefit charge carrying charge |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 87 | 73
BQDM and Demonstration project reconciliations |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 15 | 23
Pension and other postretirement benefit deferrals |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 194 | 144
Property tax refunds |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 35 | 35
COVID - 19 pandemic uncollectible reconciliation deferral |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 1 | 12
Late payment charge deferral |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 160 | 127
Unrecognized pension and other postretirement costs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 1,276 | 1,638
Net proceeds from sale of property |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 54 | 69
Sales and use tax refunds |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 29 | 37
Workers’ compensation |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 15 | 11
Deferred derivative gains - long term |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 17 | 145
Other |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 327 | 413
Refundable energy costs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – current | 99 | 34
Revenue decoupling mechanism |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – current | 0 | 29
Deferred derivative gains - short term |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – current | 90 | 311
CECONY |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 4,890 | 5,481
Regulatory liabilities – current | 153 | 308
CECONY | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 4,890 | 5,481
Regulatory liabilities – current | 153 | 308
Total Regulatory Liabilities | 5,043 | 5,789
CECONY | Future income tax | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 1,450 | 1,616
CECONY | Allowance for cost of removal less salvage | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 1,181 | 1,137
CECONY | Net unbilled revenue deferrals | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 214 | 204
CECONY | Energy efficiency portfolio standard unencumbered funds | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 7 | 7
CECONY | Settlement of prudence proceeding | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 8 | 10
CECONY | Earnings sharing - electric, gas and steam | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 10 | 10
CECONY | System benefit charge carrying charge | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 83 | 69
CECONY | BQDM and Demonstration project reconciliations | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 15 | 21
CECONY | Pension and other postretirement benefit deferrals | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 146 | 98
CECONY | Property tax refunds | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 35 | 35
CECONY | COVID - 19 pandemic uncollectible reconciliation deferral | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 1 | 12
CECONY | Late payment charge deferral | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 155 | 123
CECONY | Unrecognized pension and other postretirement costs | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 1,197 | 1,536
CECONY | Net proceeds from sale of property | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 52 | 69
CECONY | Sales and use tax refunds | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 27 | 36
CECONY | Workers’ compensation | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 15 | 11
CECONY | Deferred derivative gains - long term | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 17 | 130
CECONY | Other | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 277 | 357
CECONY | Refundable energy costs | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – current | 70 | 0
CECONY | Revenue decoupling mechanism | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – current | 0 | 21
CECONY | Deferred derivative gains - short term | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – current | $ 83 | $ 287

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