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Derivative Instruments (Notional Values) (Details) - Southern California Edison - Electric Utility - Gross amounts recognized MWh in Thousands | Dec. 31, 2015 MWh MMcf | Dec. 31, 2014 MWh MMcf
--- | --- | ---
Electricity options, swaps and forwards (GWh) |  |
Derivatives |  |
Notional volumes of derivative instruments | 6,221 | 3,618
Natural gas options, swaps and forwards (Bcf) |  |
Derivatives |  |
Notional volumes of derivative instruments | MMcf | 32 | 83
Congestion revenue rights (GWh) |  |
Derivatives |  |
Notional volumes of derivative instruments | 109,740 | 122,859
Tolling arrangements (GWh) |  |
Derivatives |  |
Notional volumes of derivative instruments | 70,663 | 79,989

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