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Derivative Instruments (Notional Values) (Details) - Southern California Edison - Electric Utility - Economic hedges | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 Bcfe GWh | Dec. 31, 2014 Bcfe GWh
Electricity options, swaps and forwards (GWh) |  |
Derivatives |  |
Notional volumes of derivative instruments | 4,807 | 3,618
Natural gas options, swaps and forwards (Bcf) |  |
Derivatives |  |
Notional volumes of derivative instruments | Bcfe | 64 | 83
Congestion revenue rights (GWh) |  |
Derivatives |  |
Notional volumes of derivative instruments | 103,207 | 122,859
Tolling arrangements (GWh) |  |
Derivatives |  |
Notional volumes of derivative instruments | 73,008 | 79,989

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