Investments (Trust gain loss) (Details) - SCE - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Investments
Gross realized gains	$ 47	$ 124	$ 102	$ 195
Gross realized losses	(5)	(8)	(14)	(31)
Net unrealized gains/(losses) for equity securities	$ (10)	$ (11)	$ 85	$ 64