Compensation and Benefit Plans - Expense Components For Plans (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Pension Plan
Pension and Other Postretirement Benefits
Service cost	$ 23	$ 24
Non-service cost (benefit)
Interest cost	48	44
Expected return on plan assets	(58)	(59)
Amortization of net loss (gain)	0	1
Regulatory adjustment	(7)	(5)
Total non-service benefit	(17)	(19)
Total expense	6	5
Postretirement Benefits Other Than Pensions
Pension and Other Postretirement Benefits
Service cost	3	3
Non-service cost (benefit)
Interest cost	10	9
Expected return on plan assets	(27)	(28)
Amortization of net loss (gain)	(20)	(24)
Regulatory adjustment	34	40
Total non-service benefit	(3)	(3)
Total expense	0	0
SCE
Non-service cost (benefit)
Total non-service benefit	(21)	(22)
SCE | Pension Plan
Pension and Other Postretirement Benefits
Service cost	23	24
Non-service cost (benefit)
Interest cost	44	40
Expected return on plan assets	(55)	(55)
Amortization of net loss (gain)	0	1
Regulatory adjustment	(7)	(5)
Total non-service benefit	(18)	(19)
Total expense	$ 5	$ 5