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Loans and Allowance for Loan Losses - Loan Losses and Related Loan Balances by Portfolio Segment (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowance for loan losses:        
Individually evaluated for impairment $ 75 $ 73    
Impaired Financing Receivable, Related Allowance 75 73    
Collectively evaluated for impairment 399 403    
Total allowance for loan losses 474 476 $ 639 $ 723
Loans held for investment:        
Individually evaluated for impairment 730 865    
Collectively evaluated for impairment 85,777 79,149    
Total loans held for investment 86,507 80,014    
Provision for Loan and Lease Losses 84 (65) 158  
Other   2 2  
Financing Receivable, Allowance for Credit Losses, Write-downs 120 155 271  
Recoveries of loans previously charged-off 34 55 27  
Commercial        
Allowance for loan losses:        
Individually evaluated for impairment 62 58    
Impaired Financing Receivable, Related Allowance 62 58    
Collectively evaluated for impairment 297 302    
Total allowance for loan losses 359 360 556 654
Loans held for investment:        
Individually evaluated for impairment 450 544    
Collectively evaluated for impairment 42,685 40,365    
Total loans held for investment 43,135 40,909    
Provision for Loan and Lease Losses   (132) 134  
Financing Receivable, Allowance for Credit Losses, Write-downs 79 116 259  
Recoveries of loans previously charged-off 27 50 25  
Consumer        
Allowance for loan losses:        
Individually evaluated for impairment 13 15    
Impaired Financing Receivable, Related Allowance 13 15    
Collectively evaluated for impairment 97 71    
Total allowance for loan losses 110 86 83 49
Loans held for investment:        
Individually evaluated for impairment 280 321    
Collectively evaluated for impairment 43,092 38,784    
Total loans held for investment 43,372 39,105    
Provision for Loan and Lease Losses   37 44  
Other   0 0  
Financing Receivable, Allowance for Credit Losses, Write-downs 41 39 12  
Recoveries of loans previously charged-off 7 5 2  
Purchased Credit- Impaired        
Allowance for loan losses:        
Individually evaluated for impairment   0    
Collectively evaluated for impairment   30    
Loans held for investment:        
Individually evaluated for impairment   0    
Collectively evaluated for impairment   0    
Unallocated        
Allowance for loan losses:        
Individually evaluated for impairment 0      
Collectively evaluated for impairment 5      
Total allowance for loan losses 5 30 0 $ 20
Loans held for investment:        
Total loans held for investment 0 0    
Provision for Loan and Lease Losses   30 (20)  
Other   0 0  
Financing Receivable, Allowance for Credit Losses, Write-downs   0 0  
Recoveries of loans previously charged-off   0 $ 0  
Residential mortgage | Consumer        
Allowance for loan losses:        
Impaired Financing Receivable, Related Allowance 12 15    
Commercial mortgage | Commercial        
Allowance for loan losses:        
Impaired Financing Receivable, Related Allowance 1 1    
Notes Receivable [Member] | Residential mortgage | Consumer        
Loans held for investment:        
Total loans held for investment 38,000      
Notes Receivable [Member] | Commercial mortgage | Commercial        
Loans held for investment:        
Total loans held for investment 16,000      
Financial and Insurance [Member] | Notes Receivable [Member] | Commercial        
Loans held for investment:        
Total loans held for investment 7,000      
Power and Utilities [Member] | Notes Receivable [Member] | Commercial        
Loans held for investment:        
Total loans held for investment 4,000      
Oil and Gas [Member] | Notes Receivable [Member] | Commercial        
Loans held for investment:        
Total loans held for investment 3,000      
Manufacturing Sector [Member] | Notes Receivable [Member] | Commercial        
Loans held for investment:        
Total loans held for investment 4,000      
Unallocated        
Loans held for investment:        
Individually evaluated for impairment 0      
Collectively evaluated for impairment 0      
Provision for Loan and Lease Losses (25)      
Financing Receivable, Allowance for Credit Losses, Write-downs 0      
Recoveries of loans previously charged-off 0      
Unallocated | Unallocated        
Allowance for loan losses:        
Total allowance for loan losses   30    
Commercial Portfolio Segment [Member]        
Loans held for investment:        
Provision for Loan and Lease Losses 51      
Commercial Portfolio Segment [Member] | Commercial        
Allowance for loan losses:        
Total allowance for loan losses   360    
Consumer Portfolio Segment [Member]        
Loans held for investment:        
Provision for Loan and Lease Losses $ 58      
Consumer Portfolio Segment [Member] | Consumer        
Allowance for loan losses:        
Total allowance for loan losses   $ 86