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Loans Loans - Consumer Banking Portfolio by Credit Quality Indicator (Detail) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, Not Past Due $ 254,669 $ 255,736
Past due 8,321 9,947
Financing Receivable, Past Due And Not Past Due 262,990 265,809
Consumer Banking    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, Not Past Due 60,417 58,436
Past due 3,616 4,627
2020 7,594  
2019 24,162  
2018 14,506  
2017 9,540  
2016 4,854  
Prior 2,402  
Total Term Loans 63,058  
Revolving Loans 967  
Revolving Loans Converted to Term 8  
Financing Receivable, Past Due And Not Past Due 64,033 63,065
Financing Receivable, Past Due And Not Past Due, Excluding PCI Loans   63,063
Auto | Consumer Banking    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, Not Past Due 57,799 55,778
Past due 3,565 4,584
2020 7,526  
2019 23,926  
2018 14,254  
2017 9,277  
2016 4,641  
Prior 1,740  
Total Term Loans 61,364  
Revolving Loans 0  
Revolving Loans Converted to Term 0  
Financing Receivable, Past Due And Not Past Due 61,364 60,362
Financing Receivable, Past Due And Not Past Due, Excluding PCI Loans   60,362
Auto | Consumer Banking | Greater than 660    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 3,410  
2019 10,995  
2018 6,842  
2017 4,538  
2016 2,294  
Prior 769  
Total Term Loans 28,848  
Revolving Loans 0  
Revolving Loans Converted to Term 0  
Financing Receivable, Past Due And Not Past Due 28,848  
Financing Receivable, Past Due And Not Past Due, Excluding PCI Loans   28,773
Auto | Consumer Banking | 621-660    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 1,467  
2019 4,813  
2018 2,831  
2017 1,784  
2016 854  
Prior 324  
Total Term Loans 12,073  
Revolving Loans 0  
Revolving Loans Converted to Term 0  
Financing Receivable, Past Due And Not Past Due 12,073  
Financing Receivable, Past Due And Not Past Due, Excluding PCI Loans   11,924
Auto | Consumer Banking | 620 or below    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 2,649  
2019 8,118  
2018 4,581  
2017 2,955  
2016 1,493  
Prior 647  
Total Term Loans 20,443  
Revolving Loans 0  
Revolving Loans Converted to Term 0  
Financing Receivable, Past Due And Not Past Due 20,443  
Financing Receivable, Past Due And Not Past Due, Excluding PCI Loans   19,665
Retail banking | Consumer Banking    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020, Current 68  
2019, Current 232  
2018, Current 252  
2017, Current 257  
2016, Current 211  
Prior, Current 655  
Total Term Loans, Current 1,675  
Revolving Loans, Current 935  
Revolving Loans Converted to Term Loan, Current 8  
Financing Receivable, Not Past Due 2,618 2,658
Past due 51 43
2020 68  
2019 236  
2018 252  
2017 263  
2016 213  
Prior 662  
Total Term Loans 1,694  
Revolving Loans 967  
Revolving Loans Converted to Term 8  
Financing Receivable, Past Due And Not Past Due 2,669 2,703
Financing Receivable, Past Due And Not Past Due, Excluding PCI Loans   2,701
30-59 days    
Financing Receivable, Credit Quality Indicator [Line Items]    
Past due 3,654 4,444
30-59 days | Consumer Banking    
Financing Receivable, Credit Quality Indicator [Line Items]    
Past due 2,304 2,852
30-59 days | Auto | Consumer Banking    
Financing Receivable, Credit Quality Indicator [Line Items]    
Past due 2,275 2,828
30-59 days | Retail banking | Consumer Banking    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 4  
2018 0  
2017 1  
2016 1  
Prior 2  
Total Term Loans 8  
Revolving Loans 21  
Revolving Loans Converted to Term Loan 0  
Past due 29 24
60-89 days    
Financing Receivable, Credit Quality Indicator [Line Items]    
Past due 1,977 2,537
60-89 days | Consumer Banking    
Financing Receivable, Credit Quality Indicator [Line Items]    
Past due 1,008 1,369
60-89 days | Auto | Consumer Banking    
Financing Receivable, Credit Quality Indicator [Line Items]    
Past due 1,000 1,361
60-89 days | Retail banking | Consumer Banking    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 2  
2016 0  
Prior 1  
Total Term Loans 3  
Revolving Loans 5  
Revolving Loans Converted to Term Loan 0  
Past due 8 8
Greater than 90 days    
Financing Receivable, Credit Quality Indicator [Line Items]    
Past due 2,690 2,966
Greater than 90 days | Consumer Banking    
Financing Receivable, Credit Quality Indicator [Line Items]    
Past due 304 406
Greater than 90 days | Auto | Consumer Banking    
Financing Receivable, Credit Quality Indicator [Line Items]    
Past due 290 395
Greater than 90 days | Retail banking | Consumer Banking    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 3  
2016 1  
Prior 4  
Total Term Loans 8  
Revolving Loans 6  
Revolving Loans Converted to Term Loan 0  
Past due $ 14 $ 11