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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]          
Loans and leases $ 972,910   $ 972,910   $ 946,895
Consumer real estate          
Financing Receivable, Impaired [Line Items]          
Real estate acquired through foreclosure 188   188   244
Loans with formal foreclosure proceeding in process 1,700   1,700    
Reclassified consumer real estate loans 128   427    
Consumer real estate | Residential Mortgage          
Unpaid Principal Balance          
With no recorded allowance 4,436   4,436   5,396
With an allowance recorded 1,516   1,516   1,977
Total 5,952   5,952   7,373
Carrying Value          
With no recorded allowance 3,534   3,534   4,268
With an allowance recorded 1,488   1,488   1,929
Total 5,022   5,022   6,197
Related Allowance 74   74   114
Average Carrying Value          
With no recorded allowance 3,746 $ 5,056 3,955 $ 5,685  
With an allowance recorded 1,551 2,330 1,696 2,508  
Total 5,297 7,386 5,651 8,193  
Interest Income Recognized          
With no recorded allowance 37 52 122 167  
With an allowance recorded 13 22 47 71  
Total 50 74 169 238  
Consumer real estate | Home equity lines of credit          
Unpaid Principal Balance          
With no recorded allowance 1,262   1,262   2,948
With an allowance recorded 560   560   812
Total 1,822   1,822   3,760
Carrying Value          
With no recorded allowance 756   756   1,599
With an allowance recorded 539   539   760
Total 1,295   1,295   2,359
Related Allowance 71   71   $ 144
Average Carrying Value          
With no recorded allowance 1,041 1,908 1,368 1,937  
With an allowance recorded 591 864 670 879  
Total 1,632 2,772 2,038 2,816  
Interest Income Recognized          
With no recorded allowance 16 27 64 79  
With an allowance recorded 5 7 17 19  
Total 21 $ 34 81 $ 98  
Consumer real estate | Chapter Seven Bankruptcy          
Financing Receivable, Impaired [Line Items]          
Loans and leases 671   671    
Consumer real estate | Chapter Seven Bankruptcy | Nonperforming Financing Receivable          
Financing Receivable, Impaired [Line Items]          
Loans and leases 112   112    
Consumer real estate | Chapter Seven Bankruptcy | Fully Insured Loans | Federal Housing Administration          
Financing Receivable, Impaired [Line Items]          
Loans and leases $ 290   $ 290