Compensation and Benefit Plans - Other Changes in Pension Plan Assets and Benefit Obligations (Details) - Pension Plan - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pension and Other Postretirement Benefits
Net (gain) loss	$ (9)	$ 6	$ (45)
Settlement charges	0	0	(4)
Amortization of net gain	(4)	(2)	(8)
Total (gain) loss recognized in other comprehensive income	(13)	4	(57)
Total recognized in expense and other comprehensive income	14	27	(38)
SCE
Pension and Other Postretirement Benefits
Net (gain) loss	(2)	6	(24)
Settlement charges	0	0	(4)
Amortization of net gain	(2)	(2)	(5)
Total (gain) loss recognized in other comprehensive income	(4)	4	(33)
Total recognized in expense and other comprehensive income	$ 20	$ 22	$ (17)