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Derivative Instruments and Hedging Activities (Notional Values) (Details) (Southern California Edison, Electric Utility, Economic hedges) | Dec. 31, 2012 GWh | Dec. 31, 2011 GWh
--- | --- | ---
Electricity options, swaps and forwards (GWh) |  |
Derivatives |  |
Notional volumes of derivative instruments | 15,884 | 30,811
Natural gas options, swaps and forwards (Bcf) |  |
Derivatives |  |
Notional volumes of derivative instruments | 100 | 300
Congestion revenue rights (GWh) |  |
Derivatives |  |
Notional volumes of derivative instruments | 149,774 | 166,163
Tolling arrangements (GWh) |  |
Derivatives |  |
Notional volumes of derivative instruments | 101,485 | 104,154

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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