Variable Interest Entities (Table) (Details) (Southern California Edison, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Trust I
Variable Interest Entity [Line Items]
Dividend income	$ 27	$ 27	$ 17
Dividend distributions	27	27	17
Trust II
Variable Interest Entity [Line Items]
Dividend income	20	19
Dividend distributions	20	19
Trust III
Variable Interest Entity [Line Items]
Dividend income	13
Dividend distributions	$ 13