Derivative Instruments (Notional Values) (Details) - SCE - Electric Utility - Gross amounts recognized	12 Months Ended
	Dec. 31, 2019 Bcfe GWh	Dec. 31, 2018 Bcfe GWh
Electricity options, swaps and forwards (GWh)
Derivatives
Notional volumes of derivative instruments	3,155	2,786
Natural gas options, swaps and forwards (Bcf)
Derivatives
Notional volumes of derivative instruments | Bcfe	43	20
Congestion revenue rights (GWh)
Derivatives
Notional volumes of derivative instruments	48,170	54,453