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Derivative Instruments (Notional Values) (Details) - SCE - Electric Utility - Gross amounts recognized GWh in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 Bcfe GWh | Dec. 31, 2017 Bcfe GWh
Electricity options, swaps and forwards (GWh) |  |
Derivatives |  |
Notional volumes of derivative instruments | 2,786 | 475
Natural gas options, swaps and forwards (Bcf) |  |
Derivatives |  |
Notional volumes of derivative instruments | Bcfe | 20 | 143
Congestion revenue rights (GWh) |  |
Derivatives |  |
Notional volumes of derivative instruments | 54,453 | 78,765

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