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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]          
Loans and leases $ 929,801   $ 929,801   $ 936,749
Consumer real estate          
Financing Receivable, Impaired [Line Items]          
Real estate acquired through foreclosure 265   265   236
Loans with formal foreclosure proceeding in process 2,700   2,700    
Reclassified consumer real estate loans 186 $ 198 505 $ 624  
Interest Income Recognized          
Proceeds from sale of loans     1,600    
Consumer real estate | Residential Mortgage          
Unpaid Principal Balance          
With no recorded allowance 6,016   6,016   8,856
With an allowance recorded 2,271   2,271   2,908
Total 8,287   8,287   11,764
Carrying Value          
With no recorded allowance 4,783   4,783   6,870
With an allowance recorded 2,215   2,215   2,828
Total 6,998   6,998   9,698
Related Allowance 134   134   174
Average Carrying Value          
With no recorded allowance 5,056 7,498 5,685 7,964  
With an allowance recorded 2,330 3,254 2,508 3,565  
Total 7,386 10,752 8,193 11,529  
Interest Income Recognized          
With no recorded allowance 52 77 167 237  
With an allowance recorded 22 29 71 97  
Total 74 106 238 334  
Consumer real estate | Home equity lines of credit          
Unpaid Principal Balance          
With no recorded allowance 3,345   3,345   3,622
With an allowance recorded 910   910   972
Total 4,255   4,255   4,594
Carrying Value          
With no recorded allowance 1,828   1,828   1,956
With an allowance recorded 849   849   900
Total 2,677   2,677   2,856
Related Allowance 165   165   $ 174
Average Carrying Value          
With no recorded allowance 1,908 2,000 1,937 2,001  
With an allowance recorded 864 873 879 850  
Total 2,772 2,873 2,816 2,851  
Interest Income Recognized          
With no recorded allowance 27 27 79 82  
With an allowance recorded 7 6 19 18  
Total 34 $ 33 98 $ 100  
Consumer real estate | Chapter Seven Bankruptcy          
Financing Receivable, Impaired [Line Items]          
Loans and leases 951   951    
Consumer real estate | Chapter Seven Bankruptcy | Nonperforming Financing Receivable          
Financing Receivable, Impaired [Line Items]          
Loans and leases 220   220    
Consumer real estate | Chapter Seven Bankruptcy | Fully Insured Loans | Federal Housing Administration          
Financing Receivable, Impaired [Line Items]          
Loans and leases $ 362   $ 362