Compensation and Benefit Plans (Expenses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Plans
Pension and Other Postretirement Benefits
Service cost	$ 101	$ 120	$ 130
Non-service cost (benefit)
Interest cost	180	111	103
Expected return on plan assets	(214)	(227)	(222)
Settlement costs		4
Amortization of prior service cost			1
Amortization of net loss	3	5	11
Regulatory adjustment	(47)	6	25
Total non-service benefit	(78)	(101)	(82)
Total expense	23	19	48
Postretirement Benefits Other Than Pensions
Pension and Other Postretirement Benefits
Service cost	20	34	40
Non-service cost (benefit)
Interest cost	67	56	52
Expected return on plan assets	(107)	(97)	(106)
Amortization of prior service cost	(1)	(2)	(1)
Amortization of net loss	(50)	(45)	(35)
Regulatory adjustment	71	55	51
Total non-service benefit	(20)	(33)	(39)
Total expense		1	1
SCE
Non-service cost (benefit)
Total non-service benefit	(100)	(136)	(123)
SCE | Pension Plans
Pension and Other Postretirement Benefits
Service cost	99	118	127
Non-service cost (benefit)
Interest cost	166	101	95
Expected return on plan assets	(202)	(215)	(211)
Settlement costs		4
Amortization of prior service cost			1
Amortization of net loss	2	2	7
Regulatory adjustment	(47)	6	25
Total non-service benefit	(81)	(102)	(83)
Total expense	18	16	44
SCE | Postretirement Benefits Other Than Pensions
Pension and Other Postretirement Benefits
Service cost	20	34	40
Non-service cost (benefit)
Interest cost	67	55	52
Expected return on plan assets	(107)	(97)	(106)
Amortization of prior service cost	(1)	(2)	(1)
Amortization of net loss	(50)	(45)	(36)
Regulatory adjustment	71	55	51
Total non-service benefit	$ (20)	$ (34)	$ (40)