Derivative Instruments (Notional Values) (Details) - Southern California Edison - Electric Utility - Economic Hedges	9 Months Ended	12 Months Ended
	Sep. 30, 2019 GWh Bcfe	Dec. 31, 2018 GWh Bcfe
Electricity options, swaps and forwards (GWh)
Derivative [Line Items]
Notional volumes of derivative instruments	5,015	2,786
Natural gas options, swaps and forwards (Bcf)
Derivative [Line Items]
Notional volumes of derivative instruments | Bcfe	21	20
Congestion revenue rights (GWh)
Derivative [Line Items]
Notional volumes of derivative instruments	54,365	54,453