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, 2018
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]      
Loans and leases $ 946,895 $ 936,749  
Consumer real estate      
Financing Receivable, Impaired [Line Items]      
Real estate acquired through foreclosure 244 236  
Loans with formal foreclosure proceeding in process 2,500    
Reclassified consumer real estate loans 670 815  
Interest Income Recognized      
Proceeds from sale of loans 2,300    
Consumer real estate | Residential Mortgage      
Unpaid Principal Balance      
With no recorded allowance 5,396 8,856  
With an allowance recorded 1,977 2,908  
Total 7,373 11,764  
Carrying Value      
With no recorded allowance 4,268 6,870  
With an allowance recorded 1,929 2,828  
Total 6,197 9,698  
Related Allowance 114 174  
Average Carrying Value      
With no recorded allowance 5,424 7,737 $ 10,178
With an allowance recorded 2,409 3,414 5,067
Total 7,833 11,151 15,245
Interest Income Recognized      
With no recorded allowance 207 311 360
With an allowance recorded 91 123 167
Total 298 434 527
Consumer real estate | Home equity lines of credit      
Unpaid Principal Balance      
With no recorded allowance 2,948 3,622  
With an allowance recorded 812 972  
Total 3,760 4,594  
Carrying Value      
With no recorded allowance 1,599 1,956  
With an allowance recorded 760 900  
Total 2,359 2,856  
Related Allowance 144 174  
Average Carrying Value      
With no recorded allowance 1,894 1,997 1,906
With an allowance recorded 861 858 852
Total 2,755 2,855 2,758
Interest Income Recognized      
With no recorded allowance 105 109 90
With an allowance recorded 25 24 24
Total 130 $ 133 $ 114
Consumer real estate | Chapter Seven Bankruptcy      
Financing Receivable, Impaired [Line Items]      
Loans and leases 858    
Consumer real estate | Chapter Seven Bankruptcy | Nonperforming Financing Receivable      
Financing Receivable, Impaired [Line Items]      
Loans and leases 185    
Consumer real estate | Chapter Seven Bankruptcy | Fully Insured Loans | Federal Housing Administration      
Financing Receivable, Impaired [Line Items]      
Loans and leases $ 344