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Investments (Amortized Cost and Fair Value of Nuclear Decommissioning Trusts) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value $ 4,242 $ 4,331    
SCE        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value 4,242 4,331 $ 4,799 $ 4,494
Repurchase agreements payable 114 81    
SCE | Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Amortized Cost 2,784 2,917    
Fair Value 4,369 4,355    
Decommissioning Trust Investments 4,242 4,331    
SCE | Fair Value, Measurements, Recurring | Stocks        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Amortized Cost 319 304    
Fair Value 1,547 1,460    
SCE | Fair Value, Measurements, Recurring | Municipal bonds        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Amortized Cost 659 691    
Fair Value 766 840    
SCE | Fair Value, Measurements, Recurring | U.S. government and agency securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Amortized Cost 1,131 1,070    
Fair Value 1,191 1,128    
SCE | Fair Value, Measurements, Recurring | Corporate bonds        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Amortized Cost 600 708    
Fair Value 659 755    
SCE | Fair Value, Measurements, Recurring | Short-term investments and receivables/payables        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Amortized Cost 75 144    
Fair Value $ 79 $ 148