Annual report pursuant to Section 13 and 15(d)

Outstanding Loans and Leases - Consumer Real Estate - Impaired Loans (Details)

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Outstanding Loans and Leases - Consumer Real Estate - Impaired Loans (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]      
Loans and leases $ 936,749 $ 906,683  
Consumer real estate      
Financing Receivable, Impaired [Line Items]      
Real estate acquired through foreclosure 236 363  
Loans with formal foreclosure proceeding in process 3,600    
Reclassified consumer real estate loans 815 1,400  
Consumer real estate | Residential Mortgage      
Unpaid Principal Balance      
With no recorded allowance 8,856 11,151  
With an allowance recorded 2,908 4,041  
Total 11,764 15,192  
Carrying Value      
With no recorded allowance 6,870 8,695  
With an allowance recorded 2,828 3,936  
Total 9,698 12,631  
Related Allowance 174 219  
Average Carrying Value      
With no recorded allowance 7,737 10,178 $ 13,867
With an allowance recorded 3,414 5,067 7,290
Total 11,151 15,245 21,157
Interest Income Recognized      
With no recorded allowance 311 360 403
With an allowance recorded 123 167 236
Total 434 527 639
Consumer real estate | Home equity lines of credit      
Unpaid Principal Balance      
With no recorded allowance 3,622 3,704  
With an allowance recorded 972 910  
Total 4,594 4,614  
Carrying Value      
With no recorded allowance 1,956 1,953  
With an allowance recorded 900 824  
Total 2,856 2,777  
Related Allowance 174 137  
Average Carrying Value      
With no recorded allowance 1,997 1,906 1,777
With an allowance recorded 858 852 785
Total 2,855 2,758 2,562
Interest Income Recognized      
With no recorded allowance 109 90 89
With an allowance recorded 24 24 24
Total 133 $ 114 $ 113
Consumer real estate | Chapter Seven Bankruptcy      
Financing Receivable, Impaired [Line Items]      
Loans and leases 1,200    
Consumer real estate | Chapter Seven Bankruptcy | Nonperforming Financing Receivable      
Financing Receivable, Impaired [Line Items]      
Loans and leases 358    
Consumer real estate | Chapter Seven Bankruptcy | Fully Insured Loans | Federal Housing Administration      
Financing Receivable, Impaired [Line Items]      
Loans and leases $ 419