Compensation and Benefit Plans (Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Pension Plans
Pension and Other Postretirement Benefits
Service cost	$ 24	$ 25	$ 48	$ 50
Non-service cost (benefit)
Interest cost	44	45	88	90
Expected return on plan assets	(59)	(54)	(118)	(108)
Amortization of net loss (gain)	1	1	2	2
Regulatory adjustment	(5)	(12)	(10)	(24)
Total non-service benefit	(19)	(20)	(38)	(40)
Total expense	5	5	10	10
Postretirement Benefits Other Than Pensions
Pension and Other Postretirement Benefits
Service cost	3	5	6	10
Non-service cost (benefit)
Interest cost	9	18	18	36
Expected return on plan assets	(28)	(27)	(56)	(54)
Amortization of net loss (gain)	(24)	(12)	(48)	(24)
Regulatory adjustment	40	16	80	32
Total non-service benefit	(3)	(5)	(6)	(10)
SCE
Non-service cost (benefit)
Total non-service benefit	(22)	(26)	(44)	(52)
SCE | Pension Plans
Pension and Other Postretirement Benefits
Service cost	24	24	48	48
Non-service cost (benefit)
Interest cost	41	42	81	84
Expected return on plan assets	(55)	(51)	(110)	(102)
Amortization of net loss (gain)			1
Regulatory adjustment	(5)	(12)	(10)	(24)
Total non-service benefit	(19)	(21)	(38)	(42)
Total expense	$ 5	$ 3	$ 10	$ 6