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, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Impaired [Line Items]      
Trial modification period for modified payment terms, minimum 3 months    
Trial modification period for modified payment terms, maximum 4 months    
Loans and leases $ 906,683 $ 896,983  
Consumer real estate      
Financing Receivable, Impaired [Line Items]      
Threshold period past due for write-off of financing receivable 180 days    
Real estate acquired through foreclosure $ 363 444  
Loans with formal foreclosure proceeding in process 4,800    
Reclassified consumer real estate loans 1,400 2,100  
Consumer real estate | Residential Mortgage      
Unpaid Principal Balance      
With no recorded allowance 11,151 14,888  
With an allowance recorded 4,041 6,624  
Total 15,192 21,512  
Carrying Value      
With no recorded allowance 8,695 11,901  
With an allowance recorded 3,936 6,471  
Total 12,631 18,372  
Related Allowance 219 399  
Average Carrying Value      
With no recorded allowance 10,178 13,867 $ 15,065
With an allowance recorded 5,067 7,290 10,826
Total 15,245 21,157 25,891
Interest Income Recognized      
With no recorded allowance 360 403 490
With an allowance recorded 167 236 411
Total $ 527 639 901
Consumer real estate | Home equity lines of credit      
Financing Receivable, Impaired [Line Items]      
Threshold period past due for write-off of financing receivable 180 days    
Unpaid Principal Balance      
With no recorded allowance $ 3,704 3,545  
With an allowance recorded 910 1,047  
Total 4,614 4,592  
Carrying Value      
With no recorded allowance 1,953 1,775  
With an allowance recorded 824 911  
Total 2,777 2,686  
Related Allowance 137 235  
Average Carrying Value      
With no recorded allowance 1,906 1,777 1,486
With an allowance recorded 852 785 743
Total 2,758 2,562 2,229
Interest Income Recognized      
With no recorded allowance 90 89 87
With an allowance recorded 24 24 25
Total 114 $ 113 $ 112
Consumer real estate | Chapter Seven Bankruptcy | Home equity lines of credit      
Financing Receivable, Impaired [Line Items]      
Loans and leases 1,400    
Consumer real estate | Nonperforming Financing Receivable | Chapter Seven Bankruptcy      
Financing Receivable, Impaired [Line Items]      
Loans and leases 543    
Consumer real estate | Federal Housing Administration | Fully Insured Loans | Chapter Seven Bankruptcy | Home equity lines of credit      
Financing Receivable, Impaired [Line Items]      
Loans and leases $ 555