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Property, Plant and Equipment (Schedule of Property, Plant and Equipment) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Accumulated depreciation $ (9,958) $ (9,566)
Total utility property, plant and equipment 44,198 41,269
SCE    
Property, Plant and Equipment [Line Items]    
Distribution 26,929 25,026
Transmission 14,720 13,800
Generation 3,664 3,598
General plant and other 4,583 4,398
Accumulated depreciation (9,958) (9,566)
Total utility property, plant and equipment, Gross 39,938 37,256
Construction work in progress 4,131 3,883
Nuclear fuel, at amortized cost 129 130
Total utility property, plant and equipment $ 44,198 $ 41,269