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Debt (Recourse Debt Net Principal Amounts Due Over Five Years) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Debt Details [Line Items]    
Recourse Debt Total $ 5,015 $ 5,258
2015    
Debt Details [Line Items]    
Recourse Debt Total 0  
2016    
Debt Details [Line Items]    
Recourse Debt Total 181  
2017    
Debt Details [Line Items]    
Recourse Debt Total 0  
2018    
Debt Details [Line Items]    
Recourse Debt Total 774  
2019    
Debt Details [Line Items]    
Recourse Debt Total 469  
Thereafter    
Debt Details [Line Items]    
Recourse Debt Total $ 3,591