Derivative Instruments - Summaries of Gain (Loss) on Hedging Activities (Details) - SCE - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Realized	$ (409)	$ (14)	$ 178
Unrealized	$ 149	$ (322)	$ 310