Investments (Trust Info) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Investment Holdings [Line Items]
Nuclear decommissioning trusts, net of deferred tax	$ 3,700
SCE
Investment Holdings [Line Items]
Cumulative unrealized holding gains, net of losses	1,500	$ 2,100
Deferred income taxes related to unrealized gains	$ 316	517
Nuclear decommissioning trusts, net of deferred tax		$ 4,400