Investments (Trust gain loss) (Details) - SCE - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Investment Holdings [Line Items]
Gross realized gains	$ 74	$ 140	$ 89	$ 251
Gross realized losses	45	4	61	16
Net unrealized (losses) gains for equity securities	$ (332)	$ 16	$ (432)	$ 34

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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