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, 2019
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]      
Loans and leases $ 983,426 $ 946,895  
Consumer real estate      
Financing Receivable, Impaired [Line Items]      
Real estate acquired through foreclosure 229 244  
Loans with formal foreclosure proceeding in process 1,600    
Reclassified consumer real estate loans 611 670  
Consumer real estate | Residential Mortgage      
Unpaid Principal Balance      
With no recorded allowance 4,224 5,396  
With an allowance recorded 1,426 1,977  
Total 5,650 7,373  
Carrying Value      
With no recorded allowance 3,354 4,268  
With an allowance recorded 1,399 1,929  
Total 4,753 6,197  
Related Allowance 70 114  
Average Carrying Value      
With no recorded allowance 3,831 5,424 $ 7,737
With an allowance recorded 1,635 2,409 3,414
Total 5,466 7,833 11,151
Interest Income Recognized      
With no recorded allowance 155 207 311
With an allowance recorded 62 91 123
Total 217 298 434
Consumer real estate | Home equity lines of credit      
Unpaid Principal Balance      
With no recorded allowance 1,176 2,948  
With an allowance recorded 543 812  
Total 1,719 3,760  
Carrying Value      
With no recorded allowance 706 1,599  
With an allowance recorded 523 760  
Total 1,229 2,359  
Related Allowance 69 144  
Average Carrying Value      
With no recorded allowance 1,221 1,894 1,997
With an allowance recorded 637 861 858
Total 1,858 2,755 2,855
Interest Income Recognized      
With no recorded allowance 76 105 109
With an allowance recorded 22 25 24
Total 98 $ 130 $ 133
Consumer real estate | Chapter Seven Bankruptcy      
Financing Receivable, Impaired [Line Items]      
Loans and leases 632    
Consumer real estate | Chapter Seven Bankruptcy | Nonperforming Financing Receivable      
Financing Receivable, Impaired [Line Items]      
Loans and leases 101    
Consumer real estate | Chapter Seven Bankruptcy | Fully Insured Loans | Federal Housing Administration      
Financing Receivable, Impaired [Line Items]      
Loans and leases $ 275