Compensation and Benefit Plans (Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Pension Plans
Pension and Other Postretirement Benefits
Service cost	$ 25	$ 30	$ 75	$ 90
Non-service cost (benefit)
Interest cost	45	27	135	81
Expected return on plan assets	(54)	(57)	(162)	(171)
Settlement costs				3
Amortization of net loss		1	2	3
Regulatory adjustment	(12)	2	(36)	6
Total non-service benefit	(21)	(27)	(61)	(78)
Total expense	4	3	14	12
Postretirement Benefits Other Than Pensions
Pension and Other Postretirement Benefits
Service cost	5	8	15	24
Non-service cost (benefit)
Interest cost	18	14	54	42
Expected return on plan assets	(27)	(24)	(81)	(72)
Amortization of net loss	(12)	(12)	(36)	(36)
Regulatory adjustment	16	14	48	42
Total non-service benefit	(5)	(8)	(15)	(24)
SCE
Non-service cost (benefit)
Total non-service benefit	(26)	(34)	(78)	(99)
SCE | Pension Plans
Pension and Other Postretirement Benefits
Service cost	24	29	72	87
Non-service cost (benefit)
Interest cost	42	25	126	75
Expected return on plan assets	(51)	(54)	(153)	(162)
Settlement costs				3
Amortization of net loss		1		3
Regulatory adjustment	(12)	2	(36)	6
Total non-service benefit	(21)	(26)	(63)	(75)
Total expense	$ 3	$ 3	$ 9	$ 12