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Regulatory Matters - Regulatory Liabilities (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | $ 4,689 | $ 4,827
Regulatory liabilities – current | 123 | 102
Total Regulatory Liabilities | 4,812 | 4,929
Future income tax |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 2,374 | 2,426
Allowance for cost of removal less salvage |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 1,007 | 989
TCJA net benefits |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 421 | 471
Net proceeds from sale of property |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 166 | 173
Energy efficiency portfolio standard unencumbered funds |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 120 | 122
Net unbilled revenue deferrals |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 95 | 199
Pension and other postretirement benefit deferrals |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 65 | 75
System benefit charge carrying charge |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 53 | 48
Property tax refunds |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 41 | 45
Unrecognized other postretirement costs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 37 | 9
BQDM and REV Demo reconciliations |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 27 | 27
Settlement of gas proceedings |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 24 | 10
Sales and use tax refunds |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 19 | 8
Earnings sharing - electric, gas and steam |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 18 | 22
Settlement of prudence proceeding |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 7 | 8
Other |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 215 | 195
Refundable energy costs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – current | 68 | 44
Deferred derivative gains |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – current | 33 | 34
Revenue decoupling mechanism |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – current | 22 | 24
CECONY |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 4,262 | 4,427
Regulatory liabilities – current | 93 | 63
Total Regulatory Liabilities | 4,355 | 4,490
CECONY | Future income tax |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 2,224 | 2,275
CECONY | Allowance for cost of removal less salvage |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 859 | 843
CECONY | TCJA net benefits |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 407 | 454
CECONY | Net proceeds from sale of property |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 166 | 173
CECONY | Energy efficiency portfolio standard unencumbered funds |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 117 | 118
CECONY | Net unbilled revenue deferrals |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 95 | 199
CECONY | Pension and other postretirement benefit deferrals |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 35 | 46
CECONY | System benefit charge carrying charge |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 47 | 44
CECONY | Property tax refunds |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 41 | 45
CECONY | Unrecognized other postretirement costs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 3 | 0
CECONY | BQDM and REV Demo reconciliations |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 25 | 26
CECONY | Settlement of gas proceedings |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 24 | 10
CECONY | Sales and use tax refunds |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 19 | 8
CECONY | Earnings sharing - electric, gas and steam |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 10 | 15
CECONY | Settlement of prudence proceeding |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 7 | 8
CECONY | Other |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 183 | 163
CECONY | Refundable energy costs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – current | 38 | 12
CECONY | Deferred derivative gains |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – current | 33 | 34
CECONY | Revenue decoupling mechanism |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – current | $ 22 | $ 17

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