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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]          
Loans and leases $ 916,666   $ 916,666   $ 906,683
Consumer real estate          
Financing Receivable, Impaired [Line Items]          
Real estate acquired through foreclosure 285   285   363
Loans with formal foreclosure proceeding in process 4,100   4,100    
Reclassified consumer real estate loans 226 $ 392 426 $ 808  
Consumer real estate | Residential Mortgage          
Unpaid Principal Balance          
With no recorded allowance 9,966   9,966   11,151
With an allowance recorded 3,525   3,525   4,041
Total 13,491   13,491   15,192
Carrying Value          
With no recorded allowance 7,696   7,696   8,695
With an allowance recorded 3,424   3,424   3,936
Total 11,120   11,120   12,631
Related Allowance 211   211   219
Average Carrying Value          
With no recorded allowance 7,886 10,345 8,192 10,925  
With an allowance recorded 3,647 5,387 3,723 5,737  
Total 11,533 15,732 11,915 16,662  
Interest Income Recognized          
With no recorded allowance 81 100 160 194  
With an allowance recorded 33 46 68 97  
Total 114 146 228 291  
Consumer real estate | Home equity lines of credit          
Unpaid Principal Balance          
With no recorded allowance 3,692   3,692   3,704
With an allowance recorded 978   978   910
Total 4,670   4,670   4,614
Carrying Value          
With no recorded allowance 1,987   1,987   1,953
With an allowance recorded 886   886   824
Total 2,873   2,873   2,777
Related Allowance 170   170   $ 137
Average Carrying Value          
With no recorded allowance 1,999 1,870 2,000 1,843  
With an allowance recorded 868 873 842 882  
Total 2,867 2,743 2,842 2,725  
Interest Income Recognized          
With no recorded allowance 28 17 55 30  
With an allowance recorded 7 5 12 11  
Total 35 $ 22 67 $ 41  
Consumer real estate | Chapter Seven Bankruptcy | Home equity lines of credit          
Financing Receivable, Impaired [Line Items]          
Loans and leases 1,300   1,300    
Consumer real estate | Nonperforming Financing Receivable | Chapter Seven Bankruptcy          
Financing Receivable, Impaired [Line Items]          
Loans and leases 451   451    
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 $ 465   $ 465