Compensation and Benefit Plans (Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Pension Plans
Pension and Other Postretirement Benefits
Service cost	$ 24	$ 25	$ 72	$ 75
Non-service cost (benefit)
Interest cost	44	45	132	135
Expected return on plan assets	(58)	(54)	(176)	(162)
Amortization of net loss (gain)			2	2
Regulatory adjustment	(5)	(12)	(15)	(36)
Total non-service benefit	(19)	(21)	(57)	(61)
Total expense	5	4	15	14
Postretirement Benefits Other Than Pensions
Pension and Other Postretirement Benefits
Service cost	3	5	9	15
Non-service cost (benefit)
Interest cost	9	18	27	54
Expected return on plan assets	(28)	(27)	(84)	(81)
Amortization of net loss (gain)	(24)	(12)	(72)	(36)
Regulatory adjustment	40	16	120	48
Total non-service benefit	(3)	(5)	(9)	(15)
SCE
Non-service cost (benefit)
Total non-service benefit	(22)	(26)	(66)	(78)
SCE | Pension Plans
Pension and Other Postretirement Benefits
Service cost	24	24	72	72
Non-service cost (benefit)
Interest cost	41	42	122	126
Expected return on plan assets	(56)	(51)	(166)	(153)
Amortization of net loss (gain)	1		2
Regulatory adjustment	(5)	(12)	(15)	(36)
Total non-service benefit	(19)	(21)	(57)	(63)
Total expense	$ 5	$ 3	$ 15	$ 9