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Derivative Instruments (Notional Values) (Details) - SCE - Electric Utility - Gross amounts recognized | 12 Months Ended
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Dec. 31, 2019 Bcfe GWh | Dec. 31, 2018 Bcfe GWh
Electricity options, swaps and forwards (GWh) |  |
Derivatives |  |
Notional volumes of derivative instruments | 3,155 | 2,786
Natural gas options, swaps and forwards (Bcf) |  |
Derivatives |  |
Notional volumes of derivative instruments | Bcfe | 43 | 20
Congestion revenue rights (GWh) |  |
Derivatives |  |
Notional volumes of derivative instruments | 48,170 | 54,453

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