Other Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Other Income And Expense [Line Items]
Total other income and (expenses)	$ 76	$ 81	$ 148	$ 133
SCE
Other Income And Expense [Line Items]
Equity allowance for funds used during construction	25	30	60	51
Increase in cash surrender value of life insurance policies and life insurance benefits	15	23	25	33
Interest income	1	7	1	16
Net periodic benefit income - non-service components	33	27	66	55
Civic, political and related activities and donations	(8)	(4)	(12)	(15)
Other expense	(2)	(1)	(4)	(6)
Total other income and (expenses)	64	82	136	134
Edison International
Other Income And Expense [Line Items]
Net periodic benefit income - non-service components				$ (1)
Other expense		$ (1)
Other income	12		12
Edison International | Proterra
Other Income And Expense [Line Items]
Unrealized gain (loss), pre-tax	$ 12		$ 12