Interest and Other Income and Other Expenses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
SCE interest and other income:
Total Edison International interest and other income	$ 42	$ 32	$ 111	$ 97
SCE other expenses:
Total other expenses	9	9	28	29
Edison International Parent and Other
SCE interest and other income:
Other income of Edison International Parent and Other	0	0	0	0
SCE other expenses:
Other expenses of Edison International Parent and Other	0	0	0	3
Southern California Edison
SCE interest and other income:
Equity allowance for funds used during construction	24	16	65	58
Increase in cash surrender value of life insurance policies	12	12	34	29
Interest income	3	1	5	4
Other	3	3	7	6
Total SCE interest and other income	42	32	111	97
Total Edison International interest and other income	42	32	111	97
SCE other expenses:
Civic, political and related activities and donations	6	6	17	19
Other	3	3	11	7
Total SCE other expenses	9	9	28	26
Total other expenses	$ 9	$ 9	$ 28	$ 26