Interest and Other Income and Expenses (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Other income:
Total consolidated interest and other income	$ 34	$ 34
Other expenses:
Total consolidated other expenses	11	10
Southern California Edison
Other income:
Equity allowance for funds used during construction	21	20
Increase in cash surrender value of life insurance policies	7	7
Interest income	2	2
Other	2	4
Total interest and other income	32	33
Total consolidated interest and other income	32	33
Other expenses:
Civic, political and related activities and donations	5	6
Other	5	3
Total other expenses	10	9
Total consolidated other expenses	10	9
Edison International
Other income:
Other income	2	1
Other expenses:
Other expenses	$ 1	$ 1