Derivative Instruments (Notional Values) (Details) - SCE - Electric Utility - Gross amounts recognized GWh in Thousands	12 Months Ended
	Dec. 31, 2018 Bcfe GWh	Dec. 31, 2017 Bcfe GWh
Electricity options, swaps and forwards (GWh)
Derivatives
Notional volumes of derivative instruments	2,786	475
Natural gas options, swaps and forwards (Bcf)
Derivatives
Notional volumes of derivative instruments | Bcfe	20	143
Congestion revenue rights (GWh)
Derivatives
Notional volumes of derivative instruments	54,453	78,765