Interest and Other Income and Other Expenses (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Interest and other income:
Interest and other income	$ 33	$ 31
Other expenses:
Total Edison International other expenses	(8)	(6)
Southern California Edison
Interest and other income:
Equity allowance for funds used during construction	19	22
Increase in cash surrender value of life insurance policies	12	7
Interest income	1	0
Other	1	2
Total SCE interest and other income	33	31
Interest and other income	33	31
Other expenses:
Civic, political and related activities and donations	(4)	(5)
Other	(3)	0
Total SCE other expenses	(7)	(5)
Total Edison International other expenses	(7)	(5)
Edison International Parent and Other
Other expenses:
Other expenses of Edison International Parent and Other	$ (1)	$ (1)