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Derivative Instruments (Notional Values) (Details) - Southern California Edison - Electric Utility - Economic Hedges GWh in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 Bcfe GWh | Dec. 31, 2015 Bcfe GWh
Electricity options, swaps and forwards (GWh) |  |
Derivatives |  |
Notional volumes of derivative instruments | 1,872 | 6,221
Natural gas options, swaps and forwards (Bcf) |  |
Derivatives |  |
Notional volumes of derivative instruments | Bcfe | 13 | 32
Congestion revenue rights (GWh) |  |
Derivatives |  |
Notional volumes of derivative instruments | 85,430 | 109,740
Tolling arrangements (GWh) |  |
Derivatives |  |
Notional volumes of derivative instruments | 63,654 | 70,663

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