Compensation and Benefit Plans (Expenses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Plans
Pension and Other Postretirement Benefits
Service cost	$ 120	$ 130	$ 121
Non-service cost (benefit)
Interest cost	111	103	124
Expected return on plan assets	(227)	(222)	(215)
Settlement costs	4
Amortization of prior service cost		1	2
Amortization of net (gain) loss	5	11	10
Regulatory adjustment	6	25	16
Total non-service benefit	(101)	(82)	(63)
Total expense recognized	19	48	58
Postretirement Benefits Other Than Pensions
Pension and Other Postretirement Benefits
Service cost	34	40	38
Non-service cost (benefit)
Interest cost	56	52	63
Expected return on plan assets	(97)	(106)	(119)
Amortization of prior service cost	(2)	(1)	(1)
Amortization of net (gain) loss	(45)	(35)	(29)
Regulatory adjustment	55	51	49
Total non-service benefit	(33)	(39)	(37)
Total expense	1	1	1
SCE
Non-service cost (benefit)
Total non-service benefit	(136)	(123)	(102)
SCE | Pension Plans
Pension and Other Postretirement Benefits
Service cost	118	127	119
Non-service cost (benefit)
Interest cost	101	95	114
Expected return on plan assets	(215)	(211)	(203)
Settlement costs	4
Amortization of prior service cost		1	1
Amortization of net (gain) loss	2	7	7
Regulatory adjustment	6	25	16
Total non-service benefit	(102)	(83)	(65)
Total expense recognized	16	44	54
SCE | Postretirement Benefits Other Than Pensions
Pension and Other Postretirement Benefits
Service cost	34	40	37
Non-service cost (benefit)
Interest cost	55	52	63
Expected return on plan assets	(97)	(106)	(119)
Amortization of prior service cost	(2)	(1)	(1)
Amortization of net (gain) loss	(45)	(36)	(29)
Regulatory adjustment	55	51	49
Total non-service benefit	$ (34)	$ (40)	$ (37)