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Loans and Allowance for Loan Losses - Allowance for Loan Losses and Related Loan Balances by Portfolio Segment (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Loan losses allowance        
Individually evaluated for impairment   $ 55    
Collectively evaluated for impairment   483    
Total allowance for loan losses $ 1,152 538 $ 516 $ 474
Loans held for investment:        
Individually evaluated for impairment   682    
Collectively evaluated for impairment   87,531    
Loans held for investment [1] 89,786 88,213    
Commercial        
Loan losses allowance        
Total allowance for loan losses 679 354 389 359
Loans held for investment:        
Loans held for investment 49,378 45,745    
Consumer        
Loan losses allowance        
Total allowance for loan losses 473 184 122 110
Loans held for investment:        
Loans held for investment $ 40,408 42,468    
Unallocated        
Loan losses allowance        
Total allowance for loan losses     $ 5 $ 5
Unallocated        
Loan losses allowance        
Individually evaluated for impairment   0    
Collectively evaluated for impairment   0    
Total allowance for loan losses   0    
Loans held for investment:        
Individually evaluated for impairment   0    
Collectively evaluated for impairment   0    
Loans held for investment   0    
Commercial Loans        
Loan losses allowance        
Individually evaluated for impairment   43    
Collectively evaluated for impairment   311    
Loans held for investment:        
Individually evaluated for impairment   436    
Collectively evaluated for impairment   45,309    
Commercial Loans | Commercial        
Loan losses allowance        
Total allowance for loan losses   354    
Consumer Loans        
Loan losses allowance        
Individually evaluated for impairment   12    
Collectively evaluated for impairment   172    
Loans held for investment:        
Individually evaluated for impairment   246    
Collectively evaluated for impairment   42,222    
Consumer Loans | Consumer        
Loan losses allowance        
Total allowance for loan losses   $ 184    
[1] Includes $279 million and $320 million at March 31, 2020 and December 31, 2019, respectively, for net unamortized (discounts) and premiums and deferred (fees) and costs.Accrued interest receivable on loans held for investment and securities totaled $469 million at March 31, 2020 and is included in the other assets on the consolidated balance sheet.