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Loans Loans - Consumer Banking Portfolio by Credit Quality Indicator (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans $ 251,512 $ 265,809
Consumer Banking    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 16,338  
2019 22,241  
2018 13,038  
2017 8,360  
2016 4,076  
Prior 1,855  
Total Term Loans 65,908  
Revolving Loans 795  
Revolving Loans Converted to Term 9  
Total Loans 66,712 63,065
Total Loans, Excluding PCI Loans   63,063
Auto | Consumer Banking    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 15,306  
2019 22,004  
2018 12,797  
2017 8,112  
2016 3,872  
Prior 1,228  
Total Term Loans 63,319  
Revolving Loans 0  
Revolving Loans Converted to Term 0  
Total Loans 63,319 60,362
Total Loans, Excluding PCI Loans   60,362
Retail banking | Consumer Banking    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 1,032  
2019 237  
2018 241  
2017 248  
2016 204  
Prior 627  
Total Term Loans 2,589  
Revolving Loans 795  
Revolving Loans Converted to Term 9  
Total Loans 3,393 2,703
Total Loans, Excluding PCI Loans   2,701
Loans under Paycheck Protection Program 931  
Current | Retail banking | Consumer Banking    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 1,032  
2019 237  
2018 236  
2017 243  
2016 202  
Prior 619  
Total Term Loans 2,569  
Revolving Loans 768  
Revolving Loans Converted to Term 9  
Total Loans 3,346  
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 0  
2017 1  
2016 0  
Prior 4  
Total Term Loans 5  
Revolving Loans 15  
Revolving Loans Converted to Term 0  
Total Loans 20  
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 5  
2017 1  
2016 0  
Prior 1  
Total Term Loans 7  
Revolving Loans 4  
Revolving Loans Converted to Term 0  
Total Loans 11  
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 3  
2016 2  
Prior 3  
Total Term Loans 8  
Revolving Loans 8  
Revolving Loans Converted to Term 0  
Total Loans 16  
Total Loans, Excluding PCI Loans   11
Greater than 660 | Auto | Consumer Banking    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 6,968  
2019 10,018  
2018 6,099  
2017 3,931  
2016 1,879  
Prior 519  
Total Term Loans 29,414  
Revolving Loans 0  
Revolving Loans Converted to Term 0  
Total Loans 29,414  
Total Loans, Excluding PCI Loans   28,773
621-660 | Auto | Consumer Banking    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 3,028  
2019 4,436  
2018 2,549  
2017 1,569  
2016 721  
Prior 233  
Total Term Loans 12,536  
Revolving Loans 0  
Revolving Loans Converted to Term 0  
Total Loans 12,536  
Total Loans, Excluding PCI Loans   11,924
620 or below | Auto | Consumer Banking    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 5,310  
2019 7,550  
2018 4,149  
2017 2,612  
2016 1,272  
Prior 476  
Total Term Loans 21,369  
Revolving Loans 0  
Revolving Loans Converted to Term 0  
Total Loans $ 21,369  
Total Loans, Excluding PCI Loans   $ 19,665