Property, Plant and Equipment (Textual) (Details) - SCE - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Capitalized software costs	$ 1,400	$ 1,400
Capitalized software, accumulated amortization	800	900
Capitalized software, amortization expense	249	$ 268	$ 271
Capitalized software, estimated annual amortization expense for 2017 through 2021	$ 243
Capitalized software costs | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	5 years
Capitalized software costs | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	15 years