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Loans and Allowance for Loan Losses - Outstanding Balance of Loans (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Loans disclosures        
Loans and Leases Receivable Net of Deferred Income and Purchased Credit Impaired Loans $ 77,263 $ 76,279    
Total loans held for investment (77,599) (76,804)    
Allowance for loan losses (721) (537) $ (568) $ (653)
Loans held for investment, net 76,878 76,267    
Loans covered under a loss share agreement with FDIC 19 126    
Unamortized discounts and premiums and deferred fees and costs 100 151    
Purchased credit-impaired loans        
Loans disclosures        
Loans and Leases Receivable Net of Deferred Income and Purchased Credit Impaired Loans 336 525    
Commercial portfolio        
Loans disclosures        
Loans and Leases Receivable Net of Deferred Income and Purchased Credit Impaired Loans 46,668 44,185    
Total loans held for investment (46,668) (44,185)    
Allowance for loan losses (651) (465) (421) (418)
Commercial portfolio | Commercial and industrial        
Loans disclosures        
Loans and Leases Receivable Net of Deferred Income and Purchased Credit Impaired Loans 29,730 27,623    
Commercial portfolio | Commercial mortgage        
Loans disclosures        
Loans and Leases Receivable Net of Deferred Income and Purchased Credit Impaired Loans 13,904 14,016    
Commercial portfolio | Construction        
Loans disclosures        
Loans and Leases Receivable Net of Deferred Income and Purchased Credit Impaired Loans 2,297 1,746    
Commercial portfolio | Lease financing        
Loans disclosures        
Loans and Leases Receivable Net of Deferred Income and Purchased Credit Impaired Loans 737 800    
Consumer portfolio        
Loans disclosures        
Loans and Leases Receivable Net of Deferred Income and Purchased Credit Impaired Loans 30,595 32,094    
Total loans held for investment   (32,094)    
Allowance for loan losses (49) (49) $ (69) $ (124)
Consumer portfolio | Residential mortgage        
Loans disclosures        
Loans and Leases Receivable Net of Deferred Income and Purchased Credit Impaired Loans 27,344 28,977    
Consumer portfolio | Home equity and other consumer loans        
Loans disclosures        
Loans and Leases Receivable Net of Deferred Income and Purchased Credit Impaired Loans 3,251 $ 3,117    
Notes Receivable | Commercial portfolio | Commercial mortgage        
Loans disclosures        
Total loans held for investment (16,700)      
Notes Receivable | Consumer portfolio | Residential mortgage        
Loans disclosures        
Total loans held for investment (27,300)      
Notes Receivable | Oil and gas | Commercial portfolio | Commercial and Industrial Sector [Member]        
Loans disclosures        
Total loans held for investment $ (3,700)