Interest and Other Income and Other Expenses (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
SCE interest and other income:
Interest and other income	$ 39	$ 23
SCE other expenses:
Total Edison International other expenses	10	8
Southern California Edison
SCE interest and other income:
Equity allowance for funds used during construction	21	13
Increase in cash surrender value of life insurance policies	10	7
Interest income	1	2
Other	1	1
Total SCE interest and other income	33	23
Interest and other income	33	23
SCE other expenses:
Civic, political and related activities and donations	5	5
Other	2	2
Total SCE other expenses	7	7
Total Edison International other expenses	7	7
Edison International Parent and Other
SCE interest and other income:
Edison International Parent and Other other income	6	0
SCE other expenses:
Edison International Parent and Other other expenses	$ 3	$ 1