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Variable Interest Entities (Summary of Trusts' Income Statement) (Details) - SCE - Variable Interest Entity, Not Primary Beneficiary - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
SCE Trust I      
Variable Interest Entity [Line Items]      
Dividend income $ 27 $ 27 $ 27
Dividend distributions 27 27 27
SCE Trust II      
Variable Interest Entity [Line Items]      
Dividend income 20 20 20
Dividend distributions 20 20 20
SCE Trust III      
Variable Interest Entity [Line Items]      
Dividend income 16 16 13
Dividend distributions 16 16 $ 13
SCE Trust IV      
Variable Interest Entity [Line Items]      
Dividend income 17 6  
Dividend distributions 17 $ 6  
SCE Trust V      
Variable Interest Entity [Line Items]      
Dividend income 13    
Dividend distributions $ 13