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Loans - Consumer Banking Portfolio by Credit Quality Indicator (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]      
Total Loans $ 251,624 $ 265,809 $ 245,899
Consumer Banking      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 29,724    
2019 18,253    
2018 10,209    
2017 6,191    
2016 2,717    
Prior 1,102    
Total Term Loans 68,196    
Revolving Loans 683    
Revolving Loans Converted to Term 9    
Total Loans 68,888 63,065  
Total Loans, Excluding PCI Loans   63,063  
Auto | Consumer Banking      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 28,683    
2019 18,020    
2018 9,995    
2017 5,967    
2016 2,542    
Prior 555    
Total Term Loans 65,762    
Revolving Loans 0    
Revolving Loans Converted to Term 0    
Total Loans 65,762 60,362  
Total Loans, Excluding PCI Loans   60,362  
Retail banking | Consumer Banking      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 1,041    
2019 233    
2018 214    
2017 224    
2016 175    
Prior 547    
Total Term Loans 2,434    
Revolving Loans 683    
Revolving Loans Converted to Term 9    
Total Loans 3,126 2,703  
Total Loans, Excluding PCI Loans   2,701  
Loans under Paycheck Protection Program 919    
Current | Retail banking | Consumer Banking      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 1,041    
2019 233    
2018 206    
2017 222    
2016 167    
Prior 537    
Total Term Loans 2,406    
Revolving Loans 651    
Revolving Loans Converted to Term 7    
Total Loans 3,064    
Total Loans, Excluding PCI Loans   2,658  
30-59 days | Retail banking | Consumer Banking      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 0    
2019 0    
2018 7    
2017 1    
2016 2    
Prior 2    
Total Term Loans 12    
Revolving Loans 15    
Revolving Loans Converted to Term 1    
Total Loans 28    
Total Loans, Excluding PCI Loans   24  
60-89 days | Retail banking | Consumer Banking      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 0    
2019 0    
2018 1    
2017 0    
2016 5    
Prior 4    
Total Term Loans 10    
Revolving Loans 8    
Revolving Loans Converted to Term 1    
Total Loans 19    
Total Loans, Excluding PCI Loans   8  
Greater than 90 days | Retail banking | Consumer Banking      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 0    
2019 0    
2018 0    
2017 1    
2016 1    
Prior 4    
Total Term Loans 6    
Revolving Loans 9    
Revolving Loans Converted to Term 0    
Total Loans 15    
Total Loans, Excluding PCI Loans   11  
Greater than 660 | Auto | Consumer Banking      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 13,352    
2019 8,091    
2018 4,675    
2017 2,810    
2016 1,168    
Prior 203    
Total Term Loans 30,299    
Revolving Loans 0    
Revolving Loans Converted to Term 0    
Total Loans 30,299    
Total Loans, Excluding PCI Loans   28,773  
621-660 | Auto | Consumer Banking      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 5,781    
2019 3,631    
2018 2,003    
2017 1,172    
2016 488    
Prior 109    
Total Term Loans 13,184    
Revolving Loans 0    
Revolving Loans Converted to Term 0    
Total Loans 13,184    
Total Loans, Excluding PCI Loans   11,924  
620 or below | Auto | Consumer Banking      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 9,550    
2019 6,298    
2018 3,317    
2017 1,985    
2016 886    
Prior 243    
Total Term Loans 22,279    
Revolving Loans 0    
Revolving Loans Converted to Term 0    
Total Loans $ 22,279    
Total Loans, Excluding PCI Loans   $ 19,665