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Derivative Instruments (Notional Values) (Details) - SCE - Electric Utility - Gross amounts recognized MWh in Thousands | Dec. 31, 2017 Bcfe MWh | Dec. 31, 2016 Bcfe MWh
--- | --- | ---
Electricity options, swaps and forwards (GWh) |  |
Derivatives |  |
Notional volumes of derivative instruments | 475 | 1,816
Natural gas options, swaps and forwards (Bcf) |  |
Derivatives |  |
Notional volumes of derivative instruments | Bcfe | 143 | 36
Congestion revenue rights (GWh) |  |
Derivatives |  |
Notional volumes of derivative instruments | 78,765 | 93,319
Tolling arrangements (GWh) |  |
Derivatives |  |
Notional volumes of derivative instruments | 0 | 61,093

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