Investments (Trust gain loss) (Details) - SCE - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Investments
Gross realized gains	$ 124	$ 74	$ 195	$ 89
Gross realized losses	(8)	(45)	(31)	(61)
Net unrealized (losses)/gains for equity securities	$ (11)	$ (332)	$ 64	$ (432)