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Loans and Allowance for Loan Losses - Loans in Consumer Portfolio Segment Based FICO Scores, Non-Revolving And Revolving Loans (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable $ 84,974 $ 88,213
Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 3,549  
2019 6,807  
2018 3,810  
2017 6,345  
2016 5,770  
Prior 7,342  
Revolving Loans 1,370  
Financing receivable $ 34,993 $ 42,468
2020 Percentage 10.00%  
2019 Percentage 20.00%  
2018 Percentage 11.00%  
2017 Percentage 18.00%  
2016 Percentage 16.00%  
Prior Percentage 21.00%  
Revolving Percentage 4.00%  
Total 100.00%  
Consumer | Residential mortgage and home equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 $ 3,007  
2019 4,862  
2018 3,256  
2017 6,306  
2016 5,764  
Prior 7,311  
Revolving Loans 1,113  
Financing receivable $ 31,619  
2020 Percentage 10.00%  
2019 Percentage 15.00%  
2018 Percentage 10.00%  
2017 Percentage 20.00%  
2016 Percentage 18.00%  
Prior Percentage 23.00%  
Revolving Percentage 4.00%  
Total 100.00%  
Consumer | Other consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 $ 542  
2019 1,945  
2018 554  
2017 39  
2016 6  
Prior 31  
Revolving Loans 257  
Financing receivable 3,374  
FICO Score 720 and Above | Consumer | Residential mortgage and home equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 2,661  
2019 4,311  
2018 2,717  
2017 5,379  
2016 5,061  
Prior 5,727  
Revolving Loans 884  
Financing receivable 26,740  
FICO Score 720 and Above | Consumer | Other consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 349  
2019 1,155  
2018 340  
2017 24  
2016 4  
Prior 5  
Revolving Loans 118  
Financing receivable 1,995  
FICO Score Below 720 | Consumer | Residential mortgage and home equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 322  
2019 533  
2018 522  
2017 851  
2016 664  
Prior 1,260  
Revolving Loans 212  
Financing receivable 4,364  
FICO Score Below 720 | Consumer | Other consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 193  
2019 790  
2018 214  
2017 15  
2016 2  
Prior 3  
Revolving Loans 137  
Financing receivable 1,354  
No FICO Available | Consumer | Residential mortgage and home equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 24  
2019 18  
2018 17  
2017 76  
2016 39  
Prior 324  
Revolving Loans 17  
Financing receivable 515  
No FICO Available | Consumer | Other consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 23  
Revolving Loans 2  
Financing receivable $ 25