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Loans and Allowance for Loan Losses - Summary of Loans (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Loans disclosures            
Loans held for investment [1] $ 82,236   $ 80,014      
Allowance for loan losses (445) $ (460) (476) $ (513) $ (570) $ (639)
Loans held for investment, net 81,791   79,538      
Net unamortized discounts and premiums and deferred fees and costs 326   301      
Commercial            
Loans disclosures            
Loans held for investment 40,830   40,909      
Allowance for loan losses (362) (371) (360) (435) (485) (556)
Consumer            
Loans disclosures            
Loans and Leases Receivable Net of Deferred Income and Purchased Credit Impaired Loans 41,399   39,097      
Loans held for investment 41,406   39,105      
Allowance for loan losses (78) $ (84) (86) $ (78) $ (85) $ (83)
Commercial and industrial | Commercial Loans            
Loans disclosures            
Loans and Leases Receivable Net of Deferred Income and Purchased Credit Impaired Loans 23,033   23,281      
Commercial mortgage | Commercial Loans            
Loans disclosures            
Loans and Leases Receivable Net of Deferred Income and Purchased Credit Impaired Loans 14,790   14,320      
Construction | Commercial Loans            
Loans disclosures            
Loans and Leases Receivable Net of Deferred Income and Purchased Credit Impaired Loans 1,562   1,775      
Lease financing | Commercial Loans            
Loans disclosures            
Loans and Leases Receivable Net of Deferred Income and Purchased Credit Impaired Loans 1,445   1,533      
Residential mortgage | Consumer Loans            
Loans disclosures            
Loans and Leases Receivable Net of Deferred Income and Purchased Credit Impaired Loans 37,552   35,643      
Home equity and other consumer loans | Consumer Loans            
Loans disclosures            
Loans and Leases Receivable Net of Deferred Income and Purchased Credit Impaired Loans $ 3,854   $ 3,462      
[1] Includes $326 million and $301 million at June 30, 2018 and December 31, 2017, respectively, for net unamortized (discounts) and premiums and deferred (fees) and costs.