Property, Plant and Equipment (Textual) (Details) - SCE - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Capitalized software costs	$ 2,000	$ 1,200
Capitalized software, accumulated amortization	600	600
Capitalized software, amortization expense	311	$ 218	$ 190
Capitalized software, estimated amortization year 1	338
Capitalized software, estimated amortization year 2	310
Capitalized software, estimated amortization year 3	272
Capitalized software, estimated amortization year 4	220
Capitalized software, estimated amortization year 5	$ 144
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