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Loans and Allowance for Loan Losses - Outstanding Balance of Loans (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Loans disclosures        
Total loans held for investment $ (88,213) $ (86,507)    
Allowance for loan losses (538) (474) $ (476) $ (639)
Loans Held for Investment, Net 87,675 86,033    
Unamortized discounts and premiums and deferred fees and costs 320 340    
Consumer Portfolio Segment [Member]        
Loans disclosures        
Total loans held for investment, before purchased credit-impaired loans 42,465 43,366    
Total loans held for investment (42,468) (43,372)    
Allowance for loan losses (184) (110) (86)  
Commercial Portfolio Segment [Member]        
Loans disclosures        
Total loans held for investment (45,745) (43,135)    
Allowance for loan losses (354) (359) (360)  
Commercial | Commercial and industrial        
Loans disclosures        
Total loans held for investment, before purchased credit-impaired loans 26,338 24,919    
Commercial | Commercial mortgage        
Loans disclosures        
Total loans held for investment, before purchased credit-impaired loans 16,895 15,354    
Commercial | Construction        
Loans disclosures        
Total loans held for investment, before purchased credit-impaired loans 1,511 1,613    
Commercial | Lease financing        
Loans disclosures        
Total loans held for investment, before purchased credit-impaired loans 1,001 1,249    
Consumer | Home Equity Loan [Member]        
Loans disclosures        
Total loans held for investment, before purchased credit-impaired loans 2,049 2,238    
Consumer | residential mortgage and home equity [Member]        
Loans disclosures        
Total loans held for investment, before purchased credit-impaired loans 38,018 40,677    
Consumer | Other Consumer Loans [Member]        
Loans disclosures        
Total loans held for investment, before purchased credit-impaired loans 4,450 2,695    
Commercial | Commercial mortgage        
Loans disclosures        
Total loans held for investment (16,895) (15,354)    
Commercial | Construction        
Loans disclosures        
Total loans held for investment (1,511) (1,613)    
Commercial | Commercial Portfolio Segment [Member]        
Loans disclosures        
Allowance for loan losses   (359) (360) (556)
Consumer | residential mortgage and home equity [Member]        
Loans disclosures        
Total loans held for investment (38,018) (40,677)    
Consumer | Other Consumer Loans [Member]        
Loans disclosures        
Total loans held for investment (4,450) (2,695)    
Consumer | Consumer Portfolio Segment [Member]        
Loans disclosures        
Allowance for loan losses   $ (110) $ (86) $ (83)
Notes Receivable [Member] | Commercial | Commercial mortgage        
Loans disclosures        
Total loans held for investment (18,000)      
Notes Receivable [Member] | Consumer | Residential mortgage        
Loans disclosures        
Total loans held for investment (36,000)      
Financial and Insurance [Member] | Notes Receivable [Member] | Commercial        
Loans disclosures        
Total loans held for investment (8,000)      
Power and Utilities [Member] | Notes Receivable [Member] | Commercial        
Loans disclosures        
Total loans held for investment (3,000)      
Oil and Gas [Member] | Notes Receivable [Member] | Commercial        
Loans disclosures        
Total loans held for investment (3,000)      
Manufacturing Sector [Member] | Notes Receivable [Member] | Commercial        
Loans disclosures        
Total loans held for investment $ (4,000)