Interest and Other Income and Other Expenses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
SCE interest and other income:
Total Edison International interest and other income	$ 146	$ 123	$ 174
SCE other expenses:
Total Edison International other expenses	(51)	(44)	(59)
Edison International Parent and Other
SCE interest and other income:
Other income of Edison International Parent and Other	1	0	51
SCE other expenses:
Other expenses of Edison International Parent and Other	(3)	0	0
SCE
SCE interest and other income:
Equity allowance for funds used during construction	87	74	87
Increase in cash surrender value of life insurance policies and life insurance benefits	42	39	26
Interest income	7	3	4
Other	9	7	6
Total SCE interest and other income	145	123	123
Total Edison International interest and other income	145	123	123
SCE other expenses:
Civic, political and related activities and donations	(34)	(32)	(35)
Other	(14)	(12)	(24)
Total SCE other expenses	(48)	(44)	(59)
Total Edison International other expenses	$ (48)	$ (44)	$ (59)