Other Income and Expenses (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Other income:
Total consolidated other income	$ 138	$ 141	$ 141
Other expenses:
Total consolidated other expenses	52	55	53
Southern California Edison
Other income:
Equity allowance for funds used during construction	96	96	100
Increase in cash surrender value of life insurance policies	27	26	25
Other	14	13	16
Total other income	137	135	141
Total consolidated other income	137	135	141
Other expenses:
Civic, political and related activities and donations	32	30	28
Contracting and consulting services	6	7	7
Other	12	18	16
Total other expenses	50	55	51
Total consolidated other expenses	50	55	51
Edison International
Other income:
Other income	1	6	0
Other expenses:
Other expenses	$ 2	$ 0	$ 2