Quarterly report pursuant to Section 13 or 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
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]          
Loans and leases $ 905,008   $ 905,008   $ 896,983
Chapter Seven Bankruptcy          
Financing Receivable, Impaired [Line Items]          
Loans and leases 1,500   1,500    
Nonperforming Financing Receivable | Chapter Seven Bankruptcy          
Financing Receivable, Impaired [Line Items]          
Loans and leases 616   616    
Federal Housing Administration | Fully Insured Loans | Chapter Seven Bankruptcy          
Financing Receivable, Impaired [Line Items]          
Loans and leases 603   $ 603    
Consumer Real Estate          
Financing Receivable, Impaired [Line Items]          
Minimum period for modified payments under trial modification     3 months    
Maximum period for modified payments under trial modification     4 months    
Real estate acquired through foreclosure 372   $ 372   444
Loans with formal foreclosure proceeding in process 4,900   4,900    
Real estate loans reclassified to foreclosed properties or other assets 326 $ 499 1,100 $ 1,600  
Consumer Real Estate | Residential Mortgage          
Unpaid Principal Balance          
With no recorded allowance 11,948   11,948   14,888
With an allowance recorded 4,452   4,452   6,624
Total 16,400   16,400   21,512
Carrying Value          
With no recorded allowance 9,369   9,369   11,901
With an allowance recorded 4,335   4,335   6,471
Total 13,704   13,704   18,372
Related Allowance 242   242   399
Average Carrying Value          
With no recorded allowance 9,673 13,202 10,523 14,332  
With an allowance recorded 4,676 7,398 5,371 7,563  
Total 14,349 20,600 15,894 21,895  
Interest Income Recognized          
With no recorded allowance 83 97 277 310  
With an allowance recorded 36 61 133 186  
Total 119 158 $ 410 496  
Consumer Real Estate | Home equity          
Financing Receivable, Impaired [Line Items]          
Threshold period past due for write-off of financing receivable     180 days    
Unpaid Principal Balance          
With no recorded allowance 3,734   $ 3,734   3,545
With an allowance recorded 940   940   1,047
Total 4,674   4,674   4,592
Carrying Value          
With no recorded allowance 1,959   1,959   1,775
With an allowance recorded 844   844   911
Total 2,803   2,803   2,686
Related Allowance 142   142   $ 235
Average Carrying Value          
With no recorded allowance 1,964 1,835 1,883 1,777  
With an allowance recorded 822 809 863 756  
Total 2,786 2,644 2,746 2,533  
Interest Income Recognized          
With no recorded allowance 37 23 67 68  
With an allowance recorded 7 6 18 18  
Total $ 44 $ 29 $ 85 $ 86