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Derivative Instruments (Notional Values) (Details) - Southern California Edison - Electric Utility - Economic Hedges GWh in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 GWh Bcfe | Dec. 31, 2016 GWh Bcfe
Electricity options, swaps and forwards (GWh) |  |
Derivative [Line Items] |  |
Notional volumes of derivative instruments | 1,812 | 1,816
Natural gas options, swaps and forwards (Bcf) |  |
Derivative [Line Items] |  |
Notional volumes of derivative instruments | Bcfe | 123 | 36
Congestion revenue rights (GWh) |  |
Derivative [Line Items] |  |
Notional volumes of derivative instruments | 79,224 | 93,319
Tolling arrangements (GWh) |  |
Derivative [Line Items] |  |
Notional volumes of derivative instruments | 58,153 | 61,093

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