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Fair Value Fair Value (Fair Value Measurements - Nonrecurring Fair Value Inputs) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2015
Mar. 31, 2016
Dec. 31, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Loans held-for-sale, net   $ 39 $ 105
Fair Value, Inputs, Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Loans held-for-sale, net   $ 39 $ 105
Loans held-for-sale, Automotive [Member] | Income Approach Valuation Technique [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value Inputs, Prepayment Rate 1.30%    
Fair Value Inputs, Discount Rate 0.58%    
Loans held-for-sale, Automotive [Member] | Minimum [Member] | Income Approach Valuation Technique [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value Inputs, Loss Severity 0.00%    
Loans held-for-sale, Automotive [Member] | Maximum [Member] | Income Approach Valuation Technique [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value Inputs, Loss Severity 4.80%    
Fair Value, Measurements, Nonrecurring [Member] | Loans held-for-sale, Automotive [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Loans held-for-sale, net $ 1,500    
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 $ 1,500