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 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]          
Loans and leases $ 903,153   $ 903,153   $ 896,983
Chapter Seven Bankruptcy          
Financing Receivable, Impaired [Line Items]          
Loans and leases 1,600   1,600    
Nonperforming Financing Receivable | Chapter Seven Bankruptcy          
Financing Receivable, Impaired [Line Items]          
Loans and leases 682   682    
Federal Housing Administration | Fully Insured Loans | Chapter Seven Bankruptcy          
Financing Receivable, Impaired [Line Items]          
Loans and leases 631   $ 631    
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 416   $ 416   444
Loans with formal foreclosure proceeding in process 4,700   4,700    
Real estate loans reclassified to foreclosed properties or other assets 392 $ 474 808 $ 1,100  
Consumer Real Estate | Residential Mortgage          
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
With no recorded allowance 12,619   12,619   14,888
With an allowance recorded 5,281   5,281   6,624
Total 17,900   17,900   21,512
Impaired Financing Receivable, Recorded Investment [Abstract]          
With no recorded allowance 9,929   9,929   11,901
With an allowance recorded 5,157   5,157   6,471
Total 15,086   15,086   18,372
Related Allowance 296   296   399
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
With no recorded allowance 10,345 14,401 10,925 14,897  
With an allowance recorded 5,387 7,706 5,737 7,646  
Total 15,732 22,107 16,662 22,543  
Impaired Financing Receivable, Interest Income, Accrual and Cash Basis Method [Abstract]          
With no recorded allowance 100 105 194 213  
With an allowance recorded 46 61 97 125  
Total 146 166 $ 291 338  
Consumer Real Estate | Home equity          
Financing Receivable, Impaired [Line Items]          
Threshold period past due for write-off of financing receivable     180 days    
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
With no recorded allowance 3,691   $ 3,691   3,545
With an allowance recorded 939   939   1,047
Total 4,630   4,630   4,592
Impaired Financing Receivable, Recorded Investment [Abstract]          
With no recorded allowance 1,921   1,921   1,775
With an allowance recorded 835   835   911
Total 2,756   2,756   2,686
Related Allowance 146   146   $ 235
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
With no recorded allowance 1,870 1,805 1,843 1,748  
With an allowance recorded 873 744 882 729  
Total 2,743 2,549 2,725 2,477  
Impaired Financing Receivable, Interest Income, Accrual and Cash Basis Method [Abstract]          
With no recorded allowance 17 20 30 45  
With an allowance recorded 5 5 11 12  
Total $ 22 $ 25 $ 41 $ 57