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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]          
Loans and leases $ 927,117   $ 927,117   $ 906,683
Consumer real estate          
Financing Receivable, Impaired [Line Items]          
Real estate acquired through foreclosure 259   259   363
Loans with formal foreclosure proceeding in process 3,700   3,700    
Reclassified consumer real estate loans 198 $ 326 624 $ 1,100  
Consumer real estate | Residential Mortgage          
Unpaid Principal Balance          
With no recorded allowance 9,212   9,212   11,151
With an allowance recorded 3,167   3,167   4,041
Total 12,379   12,379   15,192
Carrying Value          
With no recorded allowance 7,172   7,172   8,695
With an allowance recorded 3,079   3,079   3,936
Total 10,251   10,251   12,631
Related Allowance 188   188   219
Average Carrying Value          
With no recorded allowance 7,498 9,673 7,964 10,523  
With an allowance recorded 3,254 4,676 3,565 5,371  
Total 10,752 14,349 11,529 15,894  
Interest Income Recognized          
With no recorded allowance 77 83 237 277  
With an allowance recorded 29 36 97 133  
Total 106 119 334 410  
Consumer real estate | Home equity lines of credit          
Unpaid Principal Balance          
With no recorded allowance 3,644   3,644   3,704
With an allowance recorded 990   990   910
Total 4,634   4,634   4,614
Carrying Value          
With no recorded allowance 1,962   1,962   1,953
With an allowance recorded 909   909   824
Total 2,871   2,871   2,777
Related Allowance 181   181   $ 137
Average Carrying Value          
With no recorded allowance 2,000 1,964 2,001 1,883  
With an allowance recorded 873 822 850 863  
Total 2,873 2,786 2,851 2,746  
Interest Income Recognized          
With no recorded allowance 27 37 82 67  
With an allowance recorded 6 7 18 18  
Total 33 $ 44 100 $ 85  
Consumer real estate | Chapter Seven Bankruptcy | Home equity lines of credit          
Financing Receivable, Impaired [Line Items]          
Loans and leases 1,200   1,200    
Consumer real estate | Chapter Seven Bankruptcy | Nonperforming Financing Receivable          
Financing Receivable, Impaired [Line Items]          
Loans and leases 379   379    
Consumer real estate | Chapter Seven Bankruptcy | Fully Insured Loans | Federal Housing Administration | Home equity lines of credit          
Financing Receivable, Impaired [Line Items]          
Loans and leases $ 442   $ 442