Derivative Instruments (Hedging Activities) (Details) - SCE - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Realized	$ (14)	$ 178	$ 200
Unrealized	$ (322)	$ 310	$ (75)