Other Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Other Income And Expense [Line Items]
Total other income and (expenses)	$ 72	$ 52
Edison International
Other Income And Expense [Line Items]
Net periodic benefit income - non-service components	0	(1)
Other income	0	1
SCE
Other Income And Expense [Line Items]
Equity allowance for funds used during construction	35	21
Increase in cash surrender value of life insurance policies and life insurance benefits	10	10
Interest income		9
Net periodic benefit income - non-service components	33	28
Civic, political and related activities and donations	(4)	(11)
Other expense	(2)	(5)
Total other income and (expenses)	$ 72	$ 52