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Loans and Allowance for Loan Losses - Loan Losses and Related Loan Balances by Portfolio Segment (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Allowance for loan losses:        
Individually evaluated for impairment $ 73 $ 168    
Impaired Financing Receivable, Related Allowance 73 168    
Collectively evaluated for impairment 403 471    
Total allowance for loan losses 476 639 $ 723 $ 540
Loans held for investment:        
Individually evaluated for impairment 865 1,022    
Collectively evaluated for impairment 79,149 76,529    
Total loans held for investment 80,014 77,551    
Commercial        
Allowance for loan losses:        
Individually evaluated for impairment 58 151    
Impaired Financing Receivable, Related Allowance 58 151    
Collectively evaluated for impairment 302 405    
Total allowance for loan losses 360 556 654 471
Loans held for investment:        
Individually evaluated for impairment 544 636    
Collectively evaluated for impairment 40,365 43,470    
Total loans held for investment 40,909 44,106    
Consumer        
Allowance for loan losses:        
Individually evaluated for impairment 15 17    
Impaired Financing Receivable, Related Allowance 15 17    
Collectively evaluated for impairment 71 66    
Total allowance for loan losses 86 83 49 49
Loans held for investment:        
Individually evaluated for impairment 321 386    
Collectively evaluated for impairment 38,784 33,059    
Total loans held for investment 39,105 33,445    
Purchased Credit- Impaired        
Loans held for investment:        
Individually evaluated for impairment 0      
Collectively evaluated for impairment 0      
Unallocated        
Allowance for loan losses:        
Individually evaluated for impairment 0      
Collectively evaluated for impairment 30      
Total allowance for loan losses 30 $ 0 $ 20 $ 20
Loans held for investment:        
Total loans held for investment $ 0