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Loans and Allowance for Loan Losses (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Loans disclosures        
Loans excluding purchased credit-impaired loans $ 78,995 $ 77,263    
Purchased credit-impaired loans 304 336    
Loans held for investment 79,299 [1] 77,599    
Allowance for loan losses (879) (721) $ (530) $ (537)
Loans held for investment, net 78,420 76,878    
Loans covered under a loss share agreement with FDIC 16 19    
Net unamortized discounts and premiums and deferred fees and costs 109 100    
Commercial portfolio        
Loans disclosures        
Loans excluding purchased credit-impaired loans 48,115 46,668    
Loans held for investment 48,115 46,668    
Allowance for loan losses (822) (651) (459) (465)
Commercial portfolio | Commercial and industrial        
Loans disclosures        
Loans excluding purchased credit-impaired loans 30,212 29,730    
Commercial portfolio | Commercial mortgage        
Loans disclosures        
Loans excluding purchased credit-impaired loans 14,920 13,904    
Commercial portfolio | Construction        
Loans disclosures        
Loans excluding purchased credit-impaired loans 2,251 2,297    
Commercial portfolio | Lease financing        
Loans disclosures        
Loans excluding purchased credit-impaired loans 732 737    
Consumer portfolio        
Loans disclosures        
Loans excluding purchased credit-impaired loans 30,880 30,595    
Loans held for investment 30,880 30,595    
Allowance for loan losses (57) (49) $ (48) $ (49)
Consumer portfolio | Residential mortgage        
Loans disclosures        
Loans excluding purchased credit-impaired loans 27,495 27,344    
Consumer portfolio | Home equity and other consumer loans        
Loans disclosures        
Loans excluding purchased credit-impaired loans $ 3,385 $ 3,251    
[1] Includes $109 million and $100 million at March 31, 2016 and December 31, 2015, respectively, for net unamortized (discounts) and premiums and deferred (fees) and costs.