Investments - Summarizes of Gains and Losses (Details) - SCE - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Investments
Gross realized gains	$ 24	$ 55
Gross realized losses	(1)	(9)
Net unrealized (losses)/gains for equity securities	$ (60)	$ 95