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Fair Value Fair Value (Fair Value Measurements - Nonrecurring Fair Value Inputs) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Loans held-for-sale, net $ 15 $ 105  
Fair Value, Inputs, Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Loans held-for-sale, net $ 15 $ 105  
Fair Value, Measurements, Nonrecurring [Member] | Loans held-for-sale, Automotive [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Loans held-for-sale, net     $ 1,356
Fair Value, Measurements, Nonrecurring [Member] | Loans held-for-sale, Automotive [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Loans held-for-sale, net     $ 1,356
Income Approach Valuation Technique [Member] | Loans held-for-sale, Automotive [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value Inputs, Prepayment Rate 1.30%    
Income Approach Valuation Technique [Member] | Minimum [Member] | Loans held-for-sale, Automotive [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value Inputs, Loss Severity 0.00%    
Fair Value Inputs, Discount Rate 0.00%    
Income Approach Valuation Technique [Member] | Maximum [Member] | Loans held-for-sale, Automotive [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value Inputs, Loss Severity 4.50%    
Fair Value Inputs, Discount Rate 6.70%