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Loans and Allowance for Loan Losses (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Loans disclosures        
Loans excluding purchased credit-impaired loans $ 78,434 $ 77,551    
Loans held for investment [1] 78,434 77,551    
Allowance for loan losses (570) (639) $ (881) $ (723)
Loans held for investment, net 77,864 76,912    
Net unamortized discounts and premiums and deferred fees and costs 205 180    
Commercial portfolio        
Loans disclosures        
Loans excluding purchased credit-impaired loans 43,889 44,106    
Commercial portfolio | Commercial and industrial        
Loans disclosures        
Loans excluding purchased credit-impaired loans 25,602 25,379    
Commercial portfolio | Commercial mortgage        
Loans disclosures        
Loans excluding purchased credit-impaired loans 14,468 14,625    
Commercial portfolio | Construction        
Loans disclosures        
Loans excluding purchased credit-impaired loans 2,040 2,283    
Commercial portfolio | Lease financing        
Loans disclosures        
Loans excluding purchased credit-impaired loans 1,779 1,819    
Consumer portfolio        
Loans disclosures        
Loans excluding purchased credit-impaired loans 34,545 33,445    
Consumer portfolio | Residential mortgage        
Loans disclosures        
Loans excluding purchased credit-impaired loans 31,162 29,922    
Consumer portfolio | Home equity and other consumer loans        
Loans disclosures        
Loans excluding purchased credit-impaired loans $ 3,383 $ 3,523    
[1] Includes $205 million and $180 million at March 31, 2017 and December 31, 2016, respectively, for net unamortized (discounts) and premiums and deferred (fees) and costs.