Investments (Trust gain loss) (Details) - SCE - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Investments
Gross realized gains	$ 22	$ 77	$ 111	$ 328
Gross realized losses	(35)	(5)	(96)	(21)
Net unrealized (losses) gains for equity securities	$ (83)	$ (74)	$ (515)	$ (41)

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