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
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]      
Loans and leases $ 934,078   $ 936,749
Nonperforming Financing Receivable      
Interest Income Recognized      
Transfer of nonperforming loans to held-for-sale 2 $ 221  
Consumer real estate      
Financing Receivable, Impaired [Line Items]      
Real estate acquired through foreclosure 264   236
Loans with formal foreclosure proceeding in process 3,300    
Reclassified consumer real estate loans 168 200  
Consumer real estate | Residential Mortgage      
Unpaid Principal Balance      
With no recorded allowance 6,793   8,856
With an allowance recorded 2,634   2,908
Total 9,427   11,764
Carrying Value      
With no recorded allowance 5,451   6,870
With an allowance recorded 2,568   2,828
Total 8,019   9,698
Related Allowance 157   174
Average Carrying Value      
With no recorded allowance 6,462 8,456  
With an allowance recorded 2,705 3,832  
Total 9,167 12,288  
Interest Income Recognized      
With no recorded allowance 65 79  
With an allowance recorded 25 35  
Total 90 114  
Transfer of nonperforming loans to held-for-sale 1,200    
Consumer real estate | Home equity lines of credit      
Unpaid Principal Balance      
With no recorded allowance 3,583   3,622
With an allowance recorded 985   972
Total 4,568   4,594
Carrying Value      
With no recorded allowance 1,943   1,956
With an allowance recorded 910   900
Total 2,853   2,856
Related Allowance 181   $ 174
Average Carrying Value      
With no recorded allowance 1,961 1,991  
With an allowance recorded 892 825  
Total 2,853 2,816  
Interest Income Recognized      
With no recorded allowance 27 27  
With an allowance recorded 6 5  
Total 33 $ 32  
Consumer real estate | Chapter Seven Bankruptcy      
Financing Receivable, Impaired [Line Items]      
Loans and leases 1,100    
Consumer real estate | Chapter Seven Bankruptcy | Nonperforming Financing Receivable      
Financing Receivable, Impaired [Line Items]      
Loans and leases 299    
Consumer real estate | Chapter Seven Bankruptcy | Fully Insured Loans | Federal Housing Administration      
Financing Receivable, Impaired [Line Items]      
Loans and leases $ 405