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Loans and Allowance for Loan Losses - Summary of Loans (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Loans disclosures            
Loans held for investment [1] $ 78,829   $ 77,551      
Allowance for loan losses (542) $ (513) (639) $ (691) $ (748) $ (723)
Loans held for investment, net 78,287   76,912      
Net unamortized discounts and premiums and deferred fees and costs 277   180      
Commercial            
Loans disclosures            
Loans held for investment 41,256   44,106      
Allowance for loan losses (431) (435) (556) (614) (683) (653)
Consumer            
Loans disclosures            
Loans held for investment 37,573   33,445      
Allowance for loan losses (81) $ (78) (83) $ (77) $ (65) $ (50)
Commercial and industrial | Commercial            
Loans disclosures            
Loans held for investment 23,443   25,379      
Commercial mortgage | Commercial            
Loans disclosures            
Loans held for investment 14,161   14,625      
Construction | Commercial            
Loans disclosures            
Loans held for investment 1,856   2,283      
Lease financing | Commercial            
Loans disclosures            
Loans held for investment 1,796   1,819      
Residential mortgage | Consumer            
Loans disclosures            
Loans held for investment 34,205   29,922      
Home equity and other consumer loans | Consumer            
Loans disclosures            
Loans held for investment $ 3,368   $ 3,523      
[1] Includes $277 million and $180 million at September 30, 2017 and December 31, 2016, respectively, for net unamortized (discounts) and premiums and deferred (fees) and costs.