Interest and Other Income and Other Expenses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Interest and other income:
Interest and other income	$ 32	$ 32	$ 97	$ 114
Other expenses:
Total Edison International other expenses	9	15	29	40
Southern California Edison
Interest and other income:
Equity allowance for funds used during construction	16	21	58	63
Increase in cash surrender value of life insurance policies	12	5	29	22
Interest income	1	1	4	4
Other	3	2	6	4
Total SCE interest and other income	32	29	97	93
Interest and other income	32	29	97	93
Other expenses:
Civic, political and related activities and donations	6	8	19	21
Other	3	7	7	18
Total SCE other expenses	9	15	26	39
Total Edison International other expenses	9	15	26	39
Edison International Parent and Other
Interest and other income:
Other income of Edison International Parent and Other	0	3	0	21
Interest and other income	32	32	97	114
Other expenses:
Other expense of Edison International Parent and Other	0	0	3	1
Total Edison International other expenses	$ 9	$ 15	$ 29	$ 40