Interest and Other Income and Other Expenses (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
SCE interest and other income:
Total Edison International interest and other income	$ 37	$ 33	$ 70	$ 65
SCE other expenses:
Total other expenses	12	11	20	19
Edison International Parent and Other
SCE interest and other income:
Other income of Edison International Parent and Other	1	0	1	0
SCE other expenses:
Other expenses of Edison International Parent and Other	0	0	1	0
Southern California Edison
SCE interest and other income:
Equity allowance for funds used during construction	23	19	41	42
Increase in cash surrender value of life insurance policies	10	11	22	17
Interest income	1	2	3	3
Other	2	1	3	3
Total SCE interest and other income	36	33	69	65
Total Edison International interest and other income	36	33	69	65
SCE other expenses:
Civic, political and related activities and donations	7	8	10	12
Other	5	3	9	7
Total SCE other expenses	12	11	19	19
Total other expenses	$ 12	$ 11	$ 19	$ 19