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Regulatory Matters - Regulatory Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | $ 6,027 | $ 4,381
Regulatory liabilities—current | 374 | 185
Total Regulatory Liabilities | 6,401 | 4,566
Future income tax |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 1,753 | 1,984
Unrecognized pension and other postretirement costs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 1,638 | 32
Allowance for cost of removal less salvage (i) |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 1,315 | 1,199
2022 late payment charge deferral |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 127 | 0
Net unbilled revenue deferrals |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 204 | 209
Deferred derivative gains - long term |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 145 | 61
Pension and other postretirement benefit deferrals |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 144 | 102
System benefit charge carrying charge |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 73 | 70
Net proceeds from sale of property |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 69 | 103
Sales and use tax refunds |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 37 | 17
Property tax refunds |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 35 | 35
BQDM and Demonstration project reconciliations |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 23 | 25
Earnings sharing - electric, gas and steam |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 13 | 13
Energy efficiency portfolio standard unencumbered funds |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 5 | 15
COVID - 19 pandemic uncollectible reconciliation deferral |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 12 | 0
Workers’ compensation |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 11 | 8
Settlement of prudence proceeding (d) |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 10 | 6
Settlement of gas proceedings (e) |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 0 | 12
Other |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 413 | 490
Deferred derivative gains - short term |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities—current | 311 | 142
Refundable energy costs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities—current | 34 | 32
Revenue decoupling mechanism |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities—current | 29 | 11
CECONY |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 5,481 | 3,921
Regulatory liabilities—current | 308 | 134
CECONY | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 5,481 | 3,921
Regulatory liabilities—current | 308 | 134
Total Regulatory Liabilities | 5,789 | 4,055
CECONY | Future income tax | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 1,616 | 1,840
CECONY | Unrecognized pension and other postretirement costs | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 1,536 | 0
CECONY | Allowance for cost of removal less salvage (i) | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 1,137 | 1,033
CECONY | 2022 late payment charge deferral | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 123 | 0
CECONY | Net unbilled revenue deferrals | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 204 | 209
CECONY | Deferred derivative gains - long term | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 130 | 55
CECONY | Pension and other postretirement benefit deferrals | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 98 | 55
CECONY | System benefit charge carrying charge | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 69 | 63
CECONY | Net proceeds from sale of property | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 69 | 103
CECONY | Sales and use tax refunds | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 36 | 16
CECONY | Property tax refunds | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 35 | 35
CECONY | BQDM and Demonstration project reconciliations | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 21 | 22
CECONY | Earnings sharing - electric, gas and steam | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 10 | 10
CECONY | Energy efficiency portfolio standard unencumbered funds | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 7 | 19
CECONY | COVID - 19 pandemic uncollectible reconciliation deferral | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 12 | 0
CECONY | Workers’ compensation | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 11 | 8
CECONY | Settlement of prudence proceeding (d) | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 10 | 6
CECONY | Settlement of gas proceedings (e) | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 0 | 12
CECONY | Other | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 357 | 435
CECONY | Deferred derivative gains - short term | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities—current | 287 | 132
CECONY | Refundable energy costs | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities—current | 0 | 2
CECONY | Revenue decoupling mechanism | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities—current | $ 21 | $ 0

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