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Loans and Allowance for Loan Losses (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Loans disclosures            
Loans excluding purchased credit-impaired loans $ 71,585   $ 67,206      
Purchased credit-impaired loans 784   1,106      
Total loans held for investment 72,369   68,312      
Allowance for loan losses (559) (557) (568) (625) (638) (653)
Loans held for investment, net 71,810   67,744      
Loans covered under a loss share agreement with FDIC 199   251      
Covered loans not accounted for under accounting guidance for loans acquired with deteriorated credit quality 16   15      
Net unamortized discounts and premiums and deferred fees and costs 130   88      
Commercial portfolio
           
Loans disclosures            
Loans excluding purchased credit-impaired loans 40,788   38,379      
Total loans held for investment 40,788   38,379      
Allowance for loan losses (482) (479) (421) (480) (486) (418)
Commercial portfolio | Commercial and industrial
           
Loans disclosures            
Loans excluding purchased credit-impaired loans 25,162   23,528      
Commercial portfolio | Commercial mortgage
           
Loans disclosures            
Loans excluding purchased credit-impaired loans 13,549   13,092      
Commercial portfolio | Construction
           
Loans disclosures            
Loans excluding purchased credit-impaired loans 1,248   905      
Commercial portfolio | Lease financing
           
Loans disclosures            
Loans excluding purchased credit-impaired loans 829   854      
Consumer portfolio
           
Loans disclosures            
Loans excluding purchased credit-impaired loans 30,797   28,827      
Total loans held for investment 30,797   28,827      
Allowance for loan losses (49) (55) (69) (106) (113) (124)
Consumer portfolio | Residential mortgage
           
Loans disclosures            
Loans excluding purchased credit-impaired loans 27,619   25,547      
Consumer portfolio | Home equity and other consumer loans
           
Loans disclosures            
Loans excluding purchased credit-impaired loans $ 3,178   $ 3,280