Property, Plant and Equipment (Textual) (Details) - SCE - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Capitalized software costs	$ 1,000	$ 1,000
Capitalized software, accumulated amortization	400	500
Capitalized software, amortization expense	190	$ 198	$ 233
Capitalized software, estimated amortization year 1	191
Capitalized software, estimated amortization year 2	163
Capitalized software, estimated amortization year 3	116
Capitalized software, estimated amortization year 4	76
Capitalized software, estimated amortization year 5	$ 27
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