Derivative Instruments (Notional Values) (Details) - SCE	3 Months Ended	12 Months Ended
	Mar. 31, 2022 GWh Bcfe	Dec. 31, 2021 GWh Bcfe
Electricity options, swaps and forwards (GWh)
Derivatives
Notional volumes of derivative instruments	899	1,869
Natural gas options, swaps and forwards (Bcf)
Derivatives
Notional volumes of derivative instruments | Bcfe	47	58
Congestion revenue rights (GWh)
Derivatives
Notional volumes of derivative instruments	30,813	33,216