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Loans and Related Allowance for Credit Losses (Credit Quality Indicators for Automobile, Credit Card, Education and Other Consumer Loan Classes) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Total loans, net [1] $ 326,616   $ 326,616   $ 316,467
Gross charge-offs          
Total 284 $ 376 920 $ 1,081  
Automobile          
Gross charge-offs          
Year one     3   9
Year two     28   44
Year three     30   27
Year four     16   17
Year five     9   12
Prior     11   22
Revolving Loans     0   0
Revolving Loans Converted to Term     0   0
Total     97   131
Automobile | Using FICO Credit Metric          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 6,051   6,051   6,544
Year two 4,748   4,748   3,862
Year three 2,643   2,643   2,328
Year four 1,522   1,522   1,681
Year five 961   961   539
Prior 347   347   401
Revolving Loans 0   0   0
Revolving Loans Converted to Term 0   0   0
Total loans, net 16,272   16,272   15,355
Automobile | Greater than or equal to 780 | Using FICO Credit Metric          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 3,417   3,417   3,288
Year two 2,211   2,211   1,717
Year three 1,177   1,177   1,094
Year four 715   715   865
Year five 491   491   241
Prior 129   129   125
Revolving Loans 0   0   0
Revolving Loans Converted to Term 0   0   0
Total loans, net 8,140   8,140   7,330
Automobile | 720 to 779 | Using FICO Credit Metric          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 1,826   1,826   2,047
Year two 1,429   1,429   1,123
Year three 710   710   636
Year four 388   388   415
Year five 222   222   129
Prior 78   78   90
Revolving Loans 0   0   0
Revolving Loans Converted to Term 0   0   0
Total loans, net 4,653   4,653   4,440
Automobile | 660 to 719 | Using FICO Credit Metric          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 655   655   963
Year two 757   757   671
Year three 446   446   367
Year four 234   234   227
Year five 129   129   82
Prior 58   58   74
Revolving Loans 0   0   0
Revolving Loans Converted to Term 0   0   0
Total loans, net 2,279   2,279   2,384
Automobile | Less than 660 | Using FICO Credit Metric          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 153   153   246
Year two 351   351   351
Year three 310   310   231
Year four 185   185   174
Year five 119   119   87
Prior 82   82   112
Revolving Loans 0   0   0
Revolving Loans Converted to Term 0   0   0
Total loans, net 1,200   1,200   1,201
Credit card          
Gross charge-offs          
Year one     0   0
Year two     0   0
Year three     0   0
Year four     0   0
Year five     0   0
Prior     0   0
Revolving Loans     216   316
Revolving Loans Converted to Term     31   39
Total     247   355
Credit card | Using FICO Credit Metric          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 0   0   0
Year two 0   0   0
Year three 0   0   0
Year four 0   0   0
Year five 0   0   0
Prior 0   0   0
Revolving Loans 6,556   6,556   6,797
Revolving Loans Converted to Term 80   80   82
Total loans, net 6,636   6,636   6,879
Credit card | Greater than or equal to 780 | Using FICO Credit Metric          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 0   0   0
Year two 0   0   0
Year three 0   0   0
Year four 0   0   0
Year five 0   0   0
Prior 0   0   0
Revolving Loans 2,013   2,013   2,090
Revolving Loans Converted to Term 2   2   2
Total loans, net 2,015   2,015   2,092
Credit card | 720 to 779 | Using FICO Credit Metric          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 0   0   0
Year two 0   0   0
Year three 0   0   0
Year four 0   0   0
Year five 0   0   0
Prior 0   0   0
Revolving Loans 1,789   1,789   1,859
Revolving Loans Converted to Term 5   5   5
Total loans, net 1,794   1,794   1,864
Credit card | 660 to 719 | Using FICO Credit Metric          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 0   0   0
Year two 0   0   0
Year three 0   0   0
Year four 0   0   0
Year five 0   0   0
Prior 0   0   0
Revolving Loans 1,752   1,752   1,815
Revolving Loans Converted to Term 16   16   16
Total loans, net 1,768   1,768   1,831
Credit card | Less than 660 | Using FICO Credit Metric          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 0   0   0
Year two 0   0   0
Year three 0   0   0
Year four 0   0   0
Year five 0   0   0
Prior 0   0   0
Revolving Loans 902   902   936
Revolving Loans Converted to Term 55   55   57
Total loans, net 957   957   993
Credit card | No FICO score available or required | Using FICO Credit Metric          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 0   0   0
Year two 0   0   0
Year three 0   0   0
Year four 0   0   0
Year five 0   0   0
Prior 0   0   0
Revolving Loans 100   100   97
Revolving Loans Converted to Term 2   2   2
Total loans, net 102   102   99
Education          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 52   52   70
Year two 88   88   116
Year three 100   100   139
Year four 121   121   67
Year five 57   57   53
Prior 1,103   1,103   1,191
Revolving Loans 0   0   0
Revolving Loans Converted to Term 0   0   0
Total loans, net 1,521   1,521   1,636
Gross charge-offs          
Year one     0   0
Year two     0   0
Year three     1   1
Year four     1   1
Year five     1   1
Prior     9   16
Revolving Loans     0   0
Revolving Loans Converted to Term     0   0
Total     12   19
Education | Using FICO Credit Metric          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 52   52   70
Year two 88   88   116
Year three 100   100   139
Year four 121   121   67
Year five 57   57   53
Prior 463   463   500
Revolving Loans 0   0   0
Revolving Loans Converted to Term 0   0   0
Total loans, net 881   881   945
Education | Greater than or equal to 780 | Using FICO Credit Metric          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 13   13   22
Year two 43   43   58
Year three 50   50   79
Year four 71   71   39
Year five 34   34   33
Prior 296   296   318
Revolving Loans 0   0   0
Revolving Loans Converted to Term 0   0   0
Total loans, net 507   507   549
Education | 720 to 779 | Using FICO Credit Metric          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 17   17   20
Year two 27   27   36
Year three 30   30   38
Year four 32   32   20
Year five 15   15   14
Prior 105   105   116
Revolving Loans 0   0   0
Revolving Loans Converted to Term 0   0   0
Total loans, net 226   226   244
Education | 660 to 719 | Using FICO Credit Metric          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 8   8   13
Year two 10   10   14
Year three 12   12   15
Year four 12   12   6
Year five 6   6   5
Prior 43   43   46
Revolving Loans 0   0   0
Revolving Loans Converted to Term 0   0   0
Total loans, net 91   91   99
Education | Less than 660 | Using FICO Credit Metric          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 2   2   3
Year two 2   2   3
Year three 4   4   3
Year four 3   3   1
Year five 1   1   1
Prior 19   19   19
Revolving Loans 0   0   0
Revolving Loans Converted to Term 0   0   0
Total loans, net 31   31   30
Education | No FICO score available or required | Using FICO Credit Metric          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 12   12   12
Year two 6   6   5
Year three 4   4   4
Year four 3   3   1
Year five 1   1   0
Prior 0   0   1
Revolving Loans 0   0   0
Revolving Loans Converted to Term 0   0   0
Total loans, net 26   26   23
Education | Other internal credit metrics          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 0   0   0
Year two 0   0   0
Year three 0   0   0
Year four 0   0   0
Year five 0   0   0
Prior 640   640   691
Revolving Loans 0   0   0
Revolving Loans Converted to Term 0   0   0
Total loans, net 640   640   691
Other consumer          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 678   678   766
Year two 516   516   409
Year three 256   256   317
Year four 168   168   90
Year five 43   43   36
Prior 106   106   113
Revolving Loans 2,457   2,457   2,284
Revolving Loans Converted to Term 9   9   12
Total loans, net 4,233   4,233   4,027
Gross charge-offs          
Year one     60   76
Year two     19   27
Year three     16   26
Year four     10   13
Year five     3   8
Prior     3   9
Revolving Loans     7   11
Revolving Loans Converted to Term     0   1
Total     118   171
Other consumer | Using FICO Credit Metric          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 671   671   760
Year two 511   511   400
Year three 237   237   240
Year four 123   123   78
Year five 33   33   25
Prior 16   16   23
Revolving Loans 208   208   228
Revolving Loans Converted to Term 2   2   4
Total loans, net 1,801   1,801   1,758
Other consumer | Greater than or equal to 780 | Using FICO Credit Metric          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 212   212   245
Year two 156   156   129
Year three 73   73   64
Year four 32   32   20
Year five 9   9   5
Prior 4   4   6
Revolving Loans 34   34   37
Revolving Loans Converted to Term 0   0   1
Total loans, net 520   520   507
Other consumer | 720 to 779 | Using FICO Credit Metric          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 244   244   292
Year two 181   181   141
Year three 77   77   70
Year four 35   35   21
Year five 8   8   6
Prior 4   4   6
Revolving Loans 65   65   72
Revolving Loans Converted to Term 1   1   1
Total loans, net 615   615   609
Other consumer | 660 to 719 | Using FICO Credit Metric          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 185   185   203
Year two 133   133   97
Year three 61   61   72
Year four 36   36   22
Year five 9   9   8
Prior 5   5   6
Revolving Loans 71   71   79
Revolving Loans Converted to Term 0   0   1
Total loans, net 500   500   488
Other consumer | Less than 660 | Using FICO Credit Metric          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 30   30   20
Year two 41   41   33
Year three 26   26   34
Year four 20   20   15
Year five 7   7   6
Prior 3   3   5
Revolving Loans 38   38   40
Revolving Loans Converted to Term 1   1   1
Total loans, net 166   166   154
Other consumer | Other internal credit metrics          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Year one 7   7   6
Year two 5   5   9
Year three 19   19   77
Year four 45   45   12
Year five 10   10   11
Prior 90   90   90
Revolving Loans 2,249   2,249   2,056
Revolving Loans Converted to Term 7   7   8
Total loans, net $ 2,432   $ 2,432   $ 2,269
[1] Our consolidated assets included the following for which we have elected the fair value option: Loans held for sale of $0.9 billion, Loans held for investment of $1.1 billion and Other assets of $0.2 billion at September 30, 2025. Comparable amounts at December 31, 2024 were $0.8 billion, $1.2 billion and $0.1 billion, respectively.