Property, Plant and Equipment (Textual) (Details) - Southern California Edison - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Capitalized software costs	$ 1,400	$ 1,700
Capitalized software, accumulated amortization	900	1,000
Capitalized software, amortization expense	268	$ 271	$ 251
Capitalized software, estimated annual amortization expense for 2015 through 2019	$ 237
Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	5 years
Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	15 years