Derivative Instruments and Hedging Activities (Notional Values) (Details) (Southern California Edison, Electric Utility, Economic hedges)	Dec. 31, 2013 GWh	Dec. 31, 2012 GWh
Electricity options, swaps and forwards (GWh)
Derivatives
Notional volumes of derivative instruments	6,274	15,884
Natural gas options, swaps and forwards (Bcf)
Derivatives
Notional volumes of derivative instruments	12	100
Congestion revenue rights (GWh)
Derivatives
Notional volumes of derivative instruments	149,234	149,774
Tolling arrangements (GWh)
Derivatives
Notional volumes of derivative instruments	87,991	101,485