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Derivative Instruments (Notional Values) (Details) - SCE - Electric Utility - Gross amounts recognized | 12 Months Ended
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Dec. 31, 2020 GWh Bcfe | Dec. 31, 2019 GWh Bcfe
Electricity options, swaps and forwards (GWh) |  |
Derivatives |  |
Notional volumes of derivative instruments | 1,581 | 3,155
Natural gas options, swaps and forwards (Bcf) |  |
Derivatives |  |
Notional volumes of derivative instruments | Bcfe | 34 | 43
Congestion revenue rights (GWh) |  |
Derivatives |  |
Notional volumes of derivative instruments | 41,151 | 48,170

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