Interest and Other Income and Other Expenses (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
SCE interest and other income:
Interest and other income	$ 31	$ 39
SCE other expenses:
Total Edison International other expenses	(6)	(10)
Southern California Edison
SCE interest and other income:
Equity allowance for funds used during construction	22	21
Increase in cash surrender value of life insurance policies	7	10
Interest income	0	1
Other	2	1
Total SCE interest and other income	31	33
Interest and other income	31	33
SCE other expenses:
Civic, political and related activities and donations	(5)	(5)
Other	0	(2)
Total SCE other expenses	(5)	(7)
Total Edison International other expenses	(5)	(7)
Edison International Parent and Other
SCE interest and other income:
Other income of Edison International Parent and Other	0	6
SCE other expenses:
Other expense of Edison International Parent and Other	$ (1)	$ (3)