Property, Plant and Equipment (Textual) (Details) - SCE - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Capitalized software costs	$ 1,000	$ 1,100
Capitalized software, accumulated amortization	500	600
Capitalized software, amortization expense	198	$ 233	$ 249
Capitalized software, estimated amortization year 1	180
Capitalized software, estimated amortization year 2	145
Capitalized software, estimated amortization year 3	107
Capitalized software, estimated amortization year 4	59
Capitalized software, estimated amortization year 5	$ 20
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	7 years