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Loans - Credit Card Delinquency Status (Detail) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Not Past Due $ 254,669 $ 255,736
Financing Receivable, Past Due 8,321 9,947
Credit Card    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Not Past Due 113,433 123,134
Financing Receivable, Past Due 4,364 5,009
Financing Receivable, Before Allowance For Credit Loss, Revolving 116,990  
Financing Receivable, Before Allowance For Credit Loss, Revolving, Converted To Term Loan 807  
Loans held for investment 117,797  
Domestic credit card: | Credit Card    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Not Past Due, Revolving 104,892  
Financing Receivable, Not Past Due, Revolving, Converted To Term Loan 611  
Financing Receivable, Not Past Due 105,503 113,857
Financing Receivable, Past Due, Revolving, Converted To Term Loan 160  
Financing Receivable, Past Due 4,046 4,656
Financing Receivable, Before Allowance For Credit Loss, Revolving 108,846  
Financing Receivable, Before Allowance For Credit Loss, Revolving, Converted To Term Loan 703  
Loans held for investment 109,549  
International card businesses: | Credit Card    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Not Past Due, Revolving 7,865  
Financing Receivable, Not Past Due, Revolving, Converted To Term Loan 65  
Financing Receivable, Not Past Due 7,930 9,277
Financing Receivable, Past Due 318 353
Financing Receivable, Before Allowance For Credit Loss, Revolving 8,144  
Financing Receivable, Before Allowance For Credit Loss, Revolving, Converted To Term Loan 104  
Loans held for investment 8,248  
30-59 days    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Past Due 3,654 4,444
30-59 days | Credit Card    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Past Due 1,210 1,474
30-59 days | Domestic credit card: | Credit Card    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Past Due, Revolving 1,060  
Financing Receivable, Past Due, Revolving, Converted To Term Loan 34  
Financing Receivable, Past Due 1,094 1,341
30-59 days | International card businesses: | Credit Card    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Past Due, Revolving 104  
Financing Receivable, Past Due, Revolving, Converted To Term Loan 12  
Financing Receivable, Past Due 116 133
60-89 days    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Past Due 1,977 2,537
60-89 days | Credit Card    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Past Due 887 1,122
60-89 days | Domestic credit card: | Credit Card    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Past Due, Revolving 787  
Financing Receivable, Past Due, Revolving, Converted To Term Loan 25  
Financing Receivable, Past Due 812 1,038
60-89 days | International card businesses: | Credit Card    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Past Due, Revolving 63  
Financing Receivable, Past Due, Revolving, Converted To Term Loan 12  
Financing Receivable, Past Due 75 84
Greater than 90 days    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Past Due 2,690 2,966
Greater than 90 days | Credit Card    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Past Due 2,267 2,413
Greater than 90 days | Domestic credit card: | Credit Card    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Past Due, Revolving 2,107  
Financing Receivable, Past Due, Revolving, Converted To Term Loan 33  
Financing Receivable, Past Due 2,140 2,277
Greater than 90 days | International card businesses: | Credit Card    
Loans and Leases Receivable Disclosure [Line Items]    
Financing Receivable, Past Due, Revolving 112  
Financing Receivable, Past Due, Revolving, Converted To Term Loan 15  
Financing Receivable, Past Due $ 127 $ 136