Variable Interest Entities (Table) (Details) - Variable Interest Entity, Not Primary Beneficiary - Southern California Edison - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
SCE Trust I
Variable Interest Entity [Line Items]
Dividend income	$ 27	$ 27	$ 27
Dividend distributions	27	27	27
SCE Trust II
Variable Interest Entity [Line Items]
Dividend income	20	20	19
Dividend distributions	20	20	$ 19
SCE Trust III
Variable Interest Entity [Line Items]
Dividend income	16	13
Dividend distributions	16	$ 13
SCE Trust IV
Variable Interest Entity [Line Items]
Dividend income	6
Dividend distributions	$ 6