Investments - Summarizes of Gains and Losses (Details) - SCE - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Investments
Gross realized gains	$ 326	$ 323	$ 150
Gross realized losses	(24)	(73)	(127)
Net unrealized (losses) gains for equity securities	$ (19)	$ 103	$ (369)