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Regulatory Matters - Regulatory Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | $ 4,381 | $ 4,513
Regulatory liabilities—current | 185 | 36
Total Regulatory Liabilities | 4,566 | 4,549
Future income tax |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 1,984 | 2,207
Allowance for cost of removal less salvage |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 1,199 | 1,090
TCJA net benefits |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 125 | 295
Net unbilled revenue deferrals |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 209 | 198
Net proceeds from sale of property |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 103 | 137
Pension and other postretirement benefit deferrals |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 102 | 85
System benefit charge carrying charge |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 70 | 64
Deferred derivative gains - long term |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 61 | 5
Property tax refunds |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 35 | 36
BQDM and REV Demo reconciliations |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 25 | 27
Settlement of gas proceedings |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 12 | 21
Sales and use tax refunds |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 17 | 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 | 32 | 11
Settlement of prudence proceeding |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 6 | 5
Workers’ compensation |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 8 | 3
Energy efficiency portfolio standard unencumbered funds |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 15 | 1
Other |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 365 | 297
Refundable energy costs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities—current | 32 | 28
Deferred derivative gains |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities—current | 142 | 8
Revenue decoupling mechanism |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities—current | 11 | 0
CECONY |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 3,921 | 4,094
Regulatory liabilities—current | 134 | 11
Total Regulatory Liabilities | 4,055 | 4,105
CECONY | Future income tax |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 1,840 | 2,062
CECONY | Allowance for cost of removal less salvage |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 1,033 | 932
CECONY | TCJA net benefits |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 123 | 286
CECONY | Net unbilled revenue deferrals |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 209 | 198
CECONY | Net proceeds from sale of property |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 103 | 137
CECONY | Pension and other postretirement benefit deferrals |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 55 | 46
CECONY | System benefit charge carrying charge |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 63 | 57
CECONY | Deferred derivative gains - long term |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 55 | 4
CECONY | Property tax refunds |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 35 | 35
CECONY | BQDM and REV Demo reconciliations |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 22 | 25
CECONY | Settlement of gas proceedings |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 12 | 21
CECONY | Sales and use tax refunds |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 16 | 16
CECONY | Earnings sharing - electric, gas and steam |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 10 | 10
CECONY | Unrecognized other postretirement costs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 0 | 0
CECONY | Settlement of prudence proceeding |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 6 | 5
CECONY | Workers’ compensation |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 8 | 3
CECONY | Energy efficiency portfolio standard unencumbered funds |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 19 | 0
CECONY | Other |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 312 | 257
CECONY | Refundable energy costs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities—current | 2 | 4
CECONY | Deferred derivative gains |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities—current | 132 | 7
CECONY | Revenue decoupling mechanism |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities—current | $ 0 | $ 0

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