Interest and Other Income and Other Expenses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
SCE interest and other income:
Total Edison International interest and other income	$ 123	$ 174	$ 147
SCE other expenses:
Total Edison International other expenses	(44)	(59)	(80)
SCE
SCE interest and other income:
Equity allowance for funds used during construction	74	87	65
Increase in cash surrender value of life insurance policies and life insurance benefits	39	26	36
Interest income	3	4	5
Other	7	6	16
Total SCE interest and other income	123	123	122
Total Edison International interest and other income	123	123	122
SCE other expenses:
Civic, political and related activities and donations	(32)	(35)	(35)
Other	(12)	(24)	(44)
Total SCE other expenses	(44)	(59)	(79)
Total Edison International other expenses	(44)	(59)	(79)
Edison International Parent and Other
SCE interest and other income:
Other income of Edison International Parent and Other1	0	51	25
SCE other expenses:
Other expense of Edison International Parent and Other	$ 0	$ 0	$ (1)