Derivative Instruments (Notional Values) (Details) - Southern California Edison - Electric Utility - Economic Hedges	6 Months Ended	12 Months Ended
	Jun. 30, 2019 GWh Bcfe	Dec. 31, 2018 GWh Bcfe
Electricity options, swaps and forwards (GWh)
Derivative [Line Items]
Notional volumes of derivative instruments	4,750	2,786
Natural gas options, swaps and forwards (Bcf)
Derivative [Line Items]
Notional volumes of derivative instruments | Bcfe	28	20
Congestion revenue rights (GWh)
Derivative [Line Items]
Notional volumes of derivative instruments	30,247	54,453