Derivative Instruments (Notional Values) (Details) - SCE	12 Months Ended
	Dec. 31, 2021 GWh Bcfe	Dec. 31, 2020 GWh Bcfe
Electricity options, swaps and forwards (GWh)
Derivatives
Notional volumes of derivative instruments	1,869	1,581
Natural gas options, swaps and forwards (Bcf)
Derivatives
Notional volumes of derivative instruments | Bcfe	58	34
Congestion revenue rights (GWh)
Derivatives
Notional volumes of derivative instruments	33,216	41,151