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Regulatory Matters - Regulatory Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | $ 4,827 | $ 4,641
Regulatory liabilities—current | 102 | 114
Total Regulatory Liabilities | 4,929 | 4,755
Future income tax |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 2,426 | 2,515
Allowance for cost of removal less salvage |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 989 | 928
TCJA net benefits |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 471 | 434
Energy efficiency portfolio standard unencumbered funds |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 122 | 127
Net unbilled revenue deferrals |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 199 | 117
Net proceeds from sale of property |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 173 | 6
Pension and other postretirement benefit deferrals |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 75 | 62
Property tax refunds |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 45 | 45
Settlement of prudence proceeding |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 8 | 37
Property tax reconciliation |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 0 | 36
Earnings sharing - electric, gas and steam |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 22 | 36
System benefit charge carrying charge |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 48 | 27
BQDM and REV Demo reconciliations |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 27 | 18
Settlement of gas proceedings |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 10 | 15
Unrecognized other postretirement costs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 9 | 7
Other |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 203 | 231
Revenue decoupling mechanism |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities—current | 24 | 53
Refundable energy costs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities—current | 44 | 31
Deferred derivative gains |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities—current | 34 | 30
CECONY |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 4,427 | 4,258
Regulatory liabilities—current | 63 | 73
Total Regulatory Liabilities | 4,490 | 4,331
CECONY | Future income tax |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 2,275 | 2,363
CECONY | Allowance for cost of removal less salvage |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 843 | 790
CECONY | TCJA net benefits |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 454 | 411
CECONY | Energy efficiency portfolio standard unencumbered funds |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 118 | 122
CECONY | Net unbilled revenue deferrals |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 199 | 117
CECONY | Net proceeds from sale of property |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 173 | 6
CECONY | Pension and other postretirement benefit deferrals |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 46 | 40
CECONY | Property tax refunds |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 45 | 45
CECONY | Settlement of prudence proceeding |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 8 | 37
CECONY | Property tax reconciliation |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 0 | 36
CECONY | Earnings sharing - electric, gas and steam |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 15 | 27
CECONY | System benefit charge carrying charge |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 44 | 24
CECONY | BQDM and REV Demo reconciliations |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 26 | 18
CECONY | Settlement of gas proceedings |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 10 | 15
CECONY | Unrecognized other postretirement costs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 0 | 7
CECONY | Other |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 171 | 200
CECONY | Revenue decoupling mechanism |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities—current | 17 | 36
CECONY | Refundable energy costs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities—current | 12 | 8
CECONY | Deferred derivative gains |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities—current | $ 34 | $ 29

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