Interest and Other Income and Expenses (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Other income:
Total consolidated interest and other income	$ 28	$ 38	$ 91	$ 110
Other expenses:
Total consolidated other expenses	15	10	38	36
Southern California Edison
Other income:
Equity allowance for funds used during construction	14	23	54	71
Increase in cash surrender value of life insurance policies	10	6	24	20
Interest income	2	2	8	5
Other	1	7	3	12
Total interest and other income	27	38	89	108
Total consolidated interest and other income	27	38	89	108
Other expenses:
Civic, political and related activities and donations	9	5	24	22
Other	6	4	14	14
Total other expenses	15	9	38	36
Total consolidated other expenses	15	9	38	36
Edison International
Other income:
Other income	1	0	2	2
Other expenses:
Other expenses	$ 0	$ 1	$ 0	$ 0