Investments (Trust gain loss) (Details) - SCE - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Investments
Gross realized gains	$ 48	$ 22	$ 243	$ 111
Gross realized losses	(38)	(35)	(69)	(96)
Net unrealized (losses)/gains for equity securities	$ (81)	$ (83)	$ (17)	$ (515)