Compensation and Benefit Plans (Expenses) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Pension Plans
Pension and Other Postretirement Benefits
Service cost	$ 24	$ 25
Non-service cost (benefit)
Interest cost	44	45
Expected return on plan assets	(59)	(54)
Amortization of net loss (gain)	1	1
Regulatory adjustment	(5)	(12)
Total non-service benefit	(19)	(20)
Total expense	5	5
Postretirement Benefits Other Than Pensions
Pension and Other Postretirement Benefits
Service cost	3	5
Non-service cost (benefit)
Interest cost	9	18
Expected return on plan assets	(28)	(27)
Amortization of net loss (gain)	(24)	(12)
Regulatory adjustment	40	16
Total non-service benefit	(3)	(5)
SCE
Non-service cost (benefit)
Total non-service benefit	(22)	(26)
SCE | Pension Plans
Pension and Other Postretirement Benefits
Service cost	24	24
Non-service cost (benefit)
Interest cost	40	42
Expected return on plan assets	(55)	(51)
Amortization of net loss (gain)	1
Regulatory adjustment	(5)	(12)
Total non-service benefit	(19)	(21)
Total expense	$ 5	$ 3