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Derivative Instruments (Notional Values) (Details) - Southern California Edison - Electric Utility - Economic Hedges | 6 Months Ended | 12 Months Ended
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Jun. 30, 2020 GWh Bcfe | Dec. 31, 2019 Bcfe GWh
Electricity options, swaps and forwards (GWh) |  |
Derivative [Line Items] |  |
Notional volumes of derivative instruments | 4,863 | 3,155
Natural gas options, swaps and forwards (Bcf) |  |
Derivative [Line Items] |  |
Notional volumes of derivative instruments | Bcfe | 50 | 43
Congestion revenue rights (GWh) |  |
Derivative [Line Items] |  |
Notional volumes of derivative instruments | 31,945 | 48,170

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