Derivative Instruments (Notional Values) (Details) (Southern California Edison, Electric Utility, Economic hedges)	Sep. 30, 2014 GWh	Dec. 31, 2013 GWh
Electricity options, swaps and forwards (GWh)
Derivatives
Notional volumes of derivative instruments	2,519	6,274
Natural gas options, swaps and forwards (Bcf)
Derivatives
Notional volumes of derivative instruments	7	12
Congestion revenue rights (GWh)
Derivatives
Notional volumes of derivative instruments	120,075	149,234
Tolling arrangements (GWh)
Derivatives
Notional volumes of derivative instruments	82,333	87,991