Compensation and Benefit Plans (Expenses) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Non-service cost (benefit)
Reclassed from other comprehensive loss	$ 2	$ 3
Pension Plans
Pension and Other Postretirement Benefits
Service cost	30	34
Non-service cost (benefit)
Interest cost	27	26
Expected return on plan assets	(57)	(56)
Amortization of net (gain) loss	1	3
Regulatory adjustment	2	4
Total non-service benefit	(27)	(23)
Total expense recognized	3	11
Postretirement Benefits Other Than Pensions
Pension and Other Postretirement Benefits
Service cost	8	10
Non-service cost (benefit)
Interest cost	14	14
Expected return on plan assets	(24)	(27)
Amortization of net (gain) loss	(12)	(8)
Regulatory adjustment	14	11
Total non-service benefit	(8)	(10)
SCE
Non-service cost (benefit)
Total non-service benefit	(34)	(33)
Reclassed from other comprehensive loss	1	2
SCE | Pension Plans
Pension and Other Postretirement Benefits
Service cost	29	33
Non-service cost (benefit)
Interest cost	25	24
Expected return on plan assets	(54)	(53)
Amortization of net (gain) loss	1	2
Regulatory adjustment	2	4
Total non-service benefit	(26)	(23)
Total expense recognized	$ 3	$ 10