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Loans and Allowance for Loan Losses - Summary of Loans (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Loans disclosures        
Loans held for investment [1] $ 87,587 $ 86,507    
Allowance for loan losses (516) (474) $ (460) $ (476)
Loans held for investment, net 87,071 86,033    
Net unamortized discounts and premiums and deferred fees and costs 343 340    
Commercial        
Loans disclosures        
Loans held for investment 43,615 43,135    
Allowance for loan losses (389) (359) (371) (360)
Consumer        
Loans disclosures        
Loans and Leases Receivable Net of Deferred Income and Purchased Credit Impaired Loans 43,967 43,366    
Loans held for investment 43,972 43,372    
Allowance for loan losses (122) (110) $ (84) $ (86)
Commercial and industrial | Commercial Loans        
Loans disclosures        
Loans and Leases Receivable Net of Deferred Income and Purchased Credit Impaired Loans 25,303 24,919    
Commercial mortgage | Commercial Loans        
Loans disclosures        
Loans and Leases Receivable Net of Deferred Income and Purchased Credit Impaired Loans 15,299 15,354    
Construction | Commercial Loans        
Loans disclosures        
Loans and Leases Receivable Net of Deferred Income and Purchased Credit Impaired Loans 1,691 1,613    
Lease financing | Commercial Loans        
Loans disclosures        
Loans and Leases Receivable Net of Deferred Income and Purchased Credit Impaired Loans 1,322 1,249    
Residential mortgage | Consumer Loans        
Loans disclosures        
Loans and Leases Receivable Net of Deferred Income and Purchased Credit Impaired Loans 38,439 38,439    
Home equity and other consumer loans | Consumer Loans        
Loans disclosures        
Loans and Leases Receivable Net of Deferred Income and Purchased Credit Impaired Loans $ 5,533 $ 4,933    
[1] Includes $343 million and $340 million at March 31, 2019 and December 31, 2018, respectively, for net unamortized (discounts) and premiums and deferred (fees) and costs.