Other Income and Expenses (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
SCE other income and expenses:
Net periodic benefit income (costs) - non-service cost components		$ 8
Total other income and expense	$ 51	33
Other income and expenses of Edison International Parent and Other:
Net periodic benefit income (costs) - non-service cost components		8
Edison International Parent and Other
SCE other income and expenses:
Net periodic benefit income (costs) - non-service cost components	0	(1)
Other	0	(1)
Other income and expenses of Edison International Parent and Other:
Net periodic benefit income (costs) - non-service cost components	0	(1)
Other	0	(1)
Southern California Edison
SCE other income and expenses:
Equity allowance for funds used during construction	22	19
Increase in cash surrender value of life insurance policies	8	12
Interest income	4	1
Net periodic benefit income (costs) - non-service cost components	26	9
Civic, political and related activities and donations	(4)	(4)
Other	(5)	(2)
Total other income and expense	51	35
Other income and expenses of Edison International Parent and Other:
Net periodic benefit income (costs) - non-service cost components	26	9
Other	$ (5)	$ (2)