v3.26.1
Loans and Related Allowance for Credit Losses, Credit Quality Indicators for Other Consumer Loans by Vintage (Details) - Total Consumer [Member] - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Total loans $ 387,147   $ 386,272
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Loan charge-offs, loans 997 $ 1,022  
Other consumer [Member]      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Term loans by origination year, current fiscal year, finance receivable 616   2,146
Term loans by origination year, fiscal year before current fiscal year, finance receivable 1,809   978
Term loans by origination year, two years before current fiscal year, finance receivable 814   947
Term loans by origination year, three years before current fiscal year, finance receivable 756   578
Term loans by origination year, four years before current fiscal year, finance receivable 448   140
Term loans by origination year, more than five years before current fiscal year, finance receivable 140   54
Revolving loans, finance receivable 30,546   29,097
Revolving loans converted to term loans, finance receivable 108   115
Total loans 35,237   34,055
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Term loans by origination year, current fiscal year, charge-offs 13   147
Term loans by origination year, fiscal year before current fiscal year, charge-offs 37   68
Term loans by origination year, two years before current fiscal year, charge-offs 11   100
Term loans by origination year, three years before current fiscal year, charge-offs 17   63
Term loans by origination year, four years before current fiscal year, charge-offs 10   13
Term loans by origination year, more than five years before current fiscal year, charge-offs 2   3
Revolving loans, charge-offs 14   58
Revolving loans converted to term loans, charge-offs 2   7
Loan charge-offs, loans 106 $ 116 459
Other consumer [Member] | FICO 740 or more [Member]      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Term loans by origination year, current fiscal year, finance receivable 460   1,493
Term loans by origination year, fiscal year before current fiscal year, finance receivable 1,245   612
Term loans by origination year, two years before current fiscal year, finance receivable 508   389
Term loans by origination year, three years before current fiscal year, finance receivable 319   205
Term loans by origination year, four years before current fiscal year, finance receivable 172   62
Term loans by origination year, more than five years before current fiscal year, finance receivable 67   22
Revolving loans, finance receivable 760   784
Revolving loans converted to term loans, finance receivable 36   34
Total loans 3,567   3,601
Other consumer [Member] | FICO 700 to 739 [Member]      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Term loans by origination year, current fiscal year, finance receivable 93   357
Term loans by origination year, fiscal year before current fiscal year, finance receivable 311   179
Term loans by origination year, two years before current fiscal year, finance receivable 150   184
Term loans by origination year, three years before current fiscal year, finance receivable 153   98
Term loans by origination year, four years before current fiscal year, finance receivable 79   21
Term loans by origination year, more than five years before current fiscal year, finance receivable 25   8
Revolving loans, finance receivable 358   396
Revolving loans converted to term loans, finance receivable 16   16
Total loans 1,185   1,259
Other consumer [Member] | FICO 660 to 699 [Member]      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Term loans by origination year, current fiscal year, finance receivable 32   162
Term loans by origination year, fiscal year before current fiscal year, finance receivable 157   101
Term loans by origination year, two years before current fiscal year, finance receivable 89   164
Term loans by origination year, three years before current fiscal year, finance receivable 136   97
Term loans by origination year, four years before current fiscal year, finance receivable 79   20
Term loans by origination year, more than five years before current fiscal year, finance receivable 20   6
Revolving loans, finance receivable 280   300
Revolving loans converted to term loans, finance receivable 12   11
Total loans 805   861
Other consumer [Member] | FICO 620 to 659 [Member]      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Term loans by origination year, current fiscal year, finance receivable 4   39
Term loans by origination year, fiscal year before current fiscal year, finance receivable 43   32
Term loans by origination year, two years before current fiscal year, finance receivable 28   72
Term loans by origination year, three years before current fiscal year, finance receivable 58   47
Term loans by origination year, four years before current fiscal year, finance receivable 37   10
Term loans by origination year, more than five years before current fiscal year, finance receivable 10   3
Revolving loans, finance receivable 106   112
Revolving loans converted to term loans, finance receivable 8   10
Total loans 294   325
Other consumer [Member] | FICO less than 620 [Member]      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Term loans by origination year, current fiscal year, finance receivable 1   24
Term loans by origination year, fiscal year before current fiscal year, finance receivable 35   33
Term loans by origination year, two years before current fiscal year, finance receivable 32   91
Term loans by origination year, three years before current fiscal year, finance receivable 80   66
Term loans by origination year, four years before current fiscal year, finance receivable 55   13
Term loans by origination year, more than five years before current fiscal year, finance receivable 15   5
Revolving loans, finance receivable 127   132
Revolving loans converted to term loans, finance receivable 13   17
Total loans 358   381
Other consumer [Member] | No FICO available [Member]      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Term loans by origination year, current fiscal year, finance receivable 26   71
Term loans by origination year, fiscal year before current fiscal year, finance receivable 18   21
Term loans by origination year, two years before current fiscal year, finance receivable 7   47
Term loans by origination year, three years before current fiscal year, finance receivable 10   65
Term loans by origination year, four years before current fiscal year, finance receivable 26   14
Term loans by origination year, more than five years before current fiscal year, finance receivable 3   10
Revolving loans, finance receivable 28,915   27,373
Revolving loans converted to term loans, finance receivable 23   27
Total loans 29,028   27,628
Other consumer [Member] | Current-29 days past due and still accruing [Member]      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Term loans by origination year, current fiscal year, finance receivable 616   2,134
Term loans by origination year, fiscal year before current fiscal year, finance receivable 1,794   967
Term loans by origination year, two years before current fiscal year, finance receivable 805   926
Term loans by origination year, three years before current fiscal year, finance receivable 739   565
Term loans by origination year, four years before current fiscal year, finance receivable 439   137
Term loans by origination year, more than five years before current fiscal year, finance receivable 137   52
Revolving loans, finance receivable 30,524   29,074
Revolving loans converted to term loans, finance receivable 98   103
Total loans 35,152   33,958
Other consumer [Member] | 30 to 89 days past due [Member]      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Term loans by origination year, current fiscal year, finance receivable 0   9
Term loans by origination year, fiscal year before current fiscal year, finance receivable 11   8
Term loans by origination year, two years before current fiscal year, finance receivable 7   15
Term loans by origination year, three years before current fiscal year, finance receivable 12   9
Term loans by origination year, four years before current fiscal year, finance receivable 7   2
Term loans by origination year, more than five years before current fiscal year, finance receivable 2   2
Revolving loans, finance receivable 11   11
Revolving loans converted to term loans, finance receivable 5   5
Total loans 55   61
Other consumer [Member] | 90 days or more past due and still accruing [Member]      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Term loans by origination year, current fiscal year, finance receivable 0   3
Term loans by origination year, fiscal year before current fiscal year, finance receivable 4   3
Term loans by origination year, two years before current fiscal year, finance receivable 2   6
Term loans by origination year, three years before current fiscal year, finance receivable 5   4
Term loans by origination year, four years before current fiscal year, finance receivable 2   1
Term loans by origination year, more than five years before current fiscal year, finance receivable 1   0
Revolving loans, finance receivable 11   12
Revolving loans converted to term loans, finance receivable 5   7
Total loans $ 30   $ 36
Overdraft [Member]      
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]      
Financing receivable, threshold period past due, writeoff 60 days   60 days