Other Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Other Income And Expense [Line Items]
Total other income and (expenses)	$ 47	$ 84	$ 195	$ 217
SCE
Other Income And Expense [Line Items]
Equity allowance for funds used during construction	32	36	92	87
Increase in cash surrender value of life insurance policies and life insurance benefits	8	27	33	60
Interest income	1	2	2	18
Net periodic benefit income - non-service components	33	28	99	83
Civic, political and related activities and donations	(16)	(7)	(28)	(22)
Other expense	(5)	(3)	(9)	(9)
Total other income and (expenses)	53	83	189	217
Edison International
Other Income And Expense [Line Items]
Net periodic benefit income - non-service components				(1)
Other income	2	$ 1	2	$ 1
Edison International | Proterra
Other Income And Expense [Line Items]
Unrealized (losses) gains on investment in Proterra	$ (8)		$ 4