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Derivative Instruments (Notional Values) (Details) - Southern California Edison - Electric Utility - Economic Hedges | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 GWh Bcfe | Dec. 31, 2018 GWh Bcfe
Electricity options, swaps and forwards (GWh) |  |
Derivative [Line Items] |  |
Notional volumes of derivative instruments | 4,750 | 2,786
Natural gas options, swaps and forwards (Bcf) |  |
Derivative [Line Items] |  |
Notional volumes of derivative instruments | Bcfe | 28 | 20
Congestion revenue rights (GWh) |  |
Derivative [Line Items] |  |
Notional volumes of derivative instruments | 30,247 | 54,453

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