Compensation and Benefit Plans (Expenses) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Pension Plans
Pension and Other Postretirement Benefits
Service cost	$ 25	$ 30
Non-service cost (benefit)
Interest cost	45	27
Expected return on plan assets	(54)	(57)
Amortization of net loss	1	1
Regulatory adjustment	(12)	2
Total non-service benefit	(20)	(27)
Total expense recognized	5	3
Postretirement Benefits Other Than Pensions
Pension and Other Postretirement Benefits
Service cost	5	8
Non-service cost (benefit)
Interest cost	18	14
Expected return on plan assets	(27)	(24)
Amortization of net loss	(12)	(12)
Regulatory adjustment	16	14
Total non-service benefit	(5)	(8)
SCE
Non-service cost (benefit)
Total non-service benefit	(26)	(34)
SCE | Pension Plans
Pension and Other Postretirement Benefits
Service cost	24	29
Non-service cost (benefit)
Interest cost	42	25
Expected return on plan assets	(51)	(54)
Amortization of net loss		1
Regulatory adjustment	(12)	2
Total non-service benefit	(21)	(26)
Total expense recognized	$ 3	$ 3