Compensation and Benefit Plans - Net Periodic Pension Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pension Plan
Pension and Other Postretirement Benefits
Service cost	$ 103	$ 101	$ 120
Non-service cost (benefit)
Interest cost	175	180	111
Expected return on plan assets	(232)	(214)	(227)
Settlement costs	0	0	4
Amortization of prior service cost	0	0	0
Amortization of net loss	4	3	5
Regulatory adjustment	(23)	(47)	6
Total non-service benefit	(76)	(78)	(101)
Total expense	27	23	19
Other Postretirement Benefits Plan
Pension and Other Postretirement Benefits
Service cost	14	20	34
Non-service cost (benefit)
Interest cost	38	67	56
Expected return on plan assets	(113)	(107)	(97)
Amortization of prior service cost	(1)	(1)	(2)
Amortization of net loss	(95)	(50)	(45)
Regulatory adjustment	157	71	55
Total non-service benefit	(14)	(20)	(33)
Total expense	0	0	1
SCE
Non-service cost (benefit)
Total non-service benefit	(91)	(100)	(136)
SCE | Pension Plan
Pension and Other Postretirement Benefits
Service cost	101	99	118
Non-service cost (benefit)
Interest cost	162	166	101
Expected return on plan assets	(219)	(202)	(215)
Settlement costs	0	0	4
Amortization of prior service cost	0	0	0
Amortization of net loss	2	2	2
Regulatory adjustment	(22)	(47)	6
Total non-service benefit	(77)	(81)	(102)
Total expense	24	18	16
SCE | Other Postretirement Benefits Plan
Pension and Other Postretirement Benefits
Service cost	14	20	34
Non-service cost (benefit)
Interest cost	38	67	55
Expected return on plan assets	(113)	(107)	(97)
Amortization of prior service cost	(1)	(1)	(2)
Amortization of net loss	(95)	(50)	(45)
Regulatory adjustment	157	71	55
Total non-service benefit	(14)	(20)	(34)
Total expense	$ 0	$ 0	$ 0