Commitments and Contingencies (Power Purchase Agreements Narrative) (Details) - SCE - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Unrecorded Unconditional Purchase Obligation [Line Items]
Costs incurred for power purchase agreements	$ 3,800	$ 3,600	$ 3,300
Signed contracts, not meeting critical contract provisions
Unrecorded Unconditional Purchase Obligation [Line Items]
2019	66
2020	176
2021	189
2022	184
2023	183
Thereafter	2,200
Operating Leases Purchase Power Contracts
Unrecorded Unconditional Purchase Obligation [Line Items]
Terminated future commitments	986
Termination payments next year	100
Termination payments in two years	77
Termination payments in three years	29
Net operating leases expense	2,300	2,300	1,900
Contingent operating lease expense	2,100	1,800	1,400
Contingent capital lease expense	$ 104	$ 99	$ 109