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Regulatory Matters - Regulatory Assets (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | $ 4,732 | $ 4,859
Regulatory assets – current | 143 | 128
Total Regulatory Assets | 4,875 | 4,987
Unrecognized pension and other postretirement costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 2,246 | 2,541
Environmental remediation costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 735 | 732
Revenue taxes |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 333 | 321
Property tax reconciliation |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 229 | 219
MTA power reliability deferral |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 224 | 248
Pension and other postretirement benefits deferrals |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 197 | 71
Deferred derivative losses |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 128 | 83
System peak reduction and energy efficiency programs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 115 | 131
Municipal infrastructure support costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 78 | 75
Deferred storm costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 73 | 77
Brooklyn Queens demand management program |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 39 | 39
Meadowlands heater odorization project |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 34 | 35
Unamortized loss on reacquired debt |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 26 | 28
Recoverable REV demonstration project costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 23 | 21
Preferred stock redemption |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 22 | 22
Gate station upgrade project |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 19 | 19
Non-wire alternative projects |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 14 | 14
Workers’ compensation |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 2 | 3
Other |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 195 | 180
Deferred derivative losses |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – current | 142 | 128
Recoverable energy costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – current | 1 | 0
CECONY |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 4,365 | 4,487
Regulatory assets – current | 125 | 113
Total Regulatory Assets | 4,490 | 4,600
CECONY | Unrecognized pension and other postretirement costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 2,113 | 2,403
CECONY | Environmental remediation costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 652 | 647
CECONY | Revenue taxes |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 318 | 308
CECONY | Property tax reconciliation |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 222 | 210
CECONY | MTA power reliability deferral |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 224 | 248
CECONY | Pension and other postretirement benefits deferrals |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 169 | 47
CECONY | Deferred derivative losses |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 118 | 76
CECONY | System peak reduction and energy efficiency programs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 114 | 130
CECONY | Municipal infrastructure support costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 78 | 75
CECONY | Deferred storm costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 0 | 0
CECONY | Brooklyn Queens demand management program |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 39 | 39
CECONY | Meadowlands heater odorization project |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 34 | 35
CECONY | Unamortized loss on reacquired debt |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 24 | 26
CECONY | Recoverable REV demonstration project costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 20 | 19
CECONY | Preferred stock redemption |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 22 | 22
CECONY | Gate station upgrade project |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 19 | 19
CECONY | Non-wire alternative projects |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 14 | 14
CECONY | Workers’ compensation |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 2 | 3
CECONY | Other |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – noncurrent | 183 | 166
CECONY | Deferred derivative losses |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – current | 125 | 113
CECONY | Recoverable energy costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets – current | $ 0 | $ 0

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