v3.26.1
Loans and Related Allowance for Credit Losses, Credit Quality Indicators for Auto Loans by Vintage (Details) - Total Consumer [Member] - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Total loans $ 394,816   $ 394,816   $ 386,272
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Loan charge-offs, loans 990 $ 1,005 1,987 $ 2,027  
Auto [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 18,009   18,009   26,538
Term loans by origination year, fiscal year before current fiscal year, finance receivable 21,801   21,801   9,059
Term loans by origination year, two years before current fiscal year, finance receivable 7,130   7,130   5,625
Term loans by origination year, three years before current fiscal year, finance receivable 4,175   4,175   4,931
Term loans by origination year, four years before current fiscal year, finance receivable 3,430   3,430   3,602
Term loans by origination year, more than five years before current fiscal year, finance receivable 2,379   2,379   732
Total loans 56,924   56,924   50,487
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Term loans by origination year, current fiscal year, charge-offs     7   29
Term loans by origination year, fiscal year before current fiscal year, charge-offs     83   41
Term loans by origination year, two years before current fiscal year, charge-offs     23   47
Term loans by origination year, three years before current fiscal year, charge-offs     18   160
Term loans by origination year, four years before current fiscal year, charge-offs     50   149
Term loans by origination year, more than five years before current fiscal year, charge-offs     42   27
Loan charge-offs, loans 109 $ 103 223 $ 230 453
Auto [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 8,919   8,919   14,805
Term loans by origination year, fiscal year before current fiscal year, finance receivable 12,051   12,051   5,654
Term loans by origination year, two years before current fiscal year, finance receivable 4,453   4,453   3,708
Term loans by origination year, three years before current fiscal year, finance receivable 2,725   2,725   2,429
Term loans by origination year, four years before current fiscal year, finance receivable 1,683   1,683   1,430
Term loans by origination year, more than five years before current fiscal year, finance receivable 871   871   219
Total loans 30,702   30,702   28,245
Auto [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 2,962   2,962   4,376
Term loans by origination year, fiscal year before current fiscal year, finance receivable 3,366   3,366   1,419
Term loans by origination year, two years before current fiscal year, finance receivable 1,067   1,067   749
Term loans by origination year, three years before current fiscal year, finance receivable 542   542   630
Term loans by origination year, four years before current fiscal year, finance receivable 422   422   443
Term loans by origination year, more than five years before current fiscal year, finance receivable 280   280   87
Total loans 8,639   8,639   7,704
Auto [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 2,524   2,524   3,411
Term loans by origination year, fiscal year before current fiscal year, finance receivable 2,702   2,702   1,003
Term loans by origination year, two years before current fiscal year, finance receivable 761   761   507
Term loans by origination year, three years before current fiscal year, finance receivable 368   368   534
Term loans by origination year, four years before current fiscal year, finance receivable 362   362   409
Term loans by origination year, more than five years before current fiscal year, finance receivable 264   264   87
Total loans 6,981   6,981   5,951
Auto [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 1,771   1,771   2,039
Term loans by origination year, fiscal year before current fiscal year, finance receivable 1,628   1,628   460
Term loans by origination year, two years before current fiscal year, finance receivable 359   359   248
Term loans by origination year, three years before current fiscal year, finance receivable 185   185   370
Term loans by origination year, four years before current fiscal year, finance receivable 255   255   314
Term loans by origination year, more than five years before current fiscal year, finance receivable 215   215   72
Total loans 4,413   4,413   3,503
Auto [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 1,831   1,831   1,892
Term loans by origination year, fiscal year before current fiscal year, finance receivable 2,016   2,016   504
Term loans by origination year, two years before current fiscal year, finance receivable 469   469   410
Term loans by origination year, three years before current fiscal year, finance receivable 339   339   950
Term loans by origination year, four years before current fiscal year, finance receivable 688   688   983
Term loans by origination year, more than five years before current fiscal year, finance receivable 726   726   258
Total loans 6,069   6,069   4,997
Auto [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 2   2   15
Term loans by origination year, fiscal year before current fiscal year, finance receivable 38   38   19
Term loans by origination year, two years before current fiscal year, finance receivable 21   21   3
Term loans by origination year, three years before current fiscal year, finance receivable 16   16   18
Term loans by origination year, four years before current fiscal year, finance receivable 20   20   23
Term loans by origination year, more than five years before current fiscal year, finance receivable 23   23   9
Total loans 120   120   87
Auto [Member] | Current-29 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 17,927   17,927   26,413
Term loans by origination year, fiscal year before current fiscal year, finance receivable 21,580   21,580   8,993
Term loans by origination year, two years before current fiscal year, finance receivable 7,067   7,067   5,560
Term loans by origination year, three years before current fiscal year, finance receivable 4,121   4,121   4,728
Term loans by origination year, four years before current fiscal year, finance receivable 3,285   3,285   3,357
Term loans by origination year, more than five years before current fiscal year, finance receivable 2,191   2,191   654
Total loans 56,171   56,171   49,705
Auto [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 77   77   115
Term loans by origination year, fiscal year before current fiscal year, finance receivable 204   204   61
Term loans by origination year, two years before current fiscal year, finance receivable 58   58   60
Term loans by origination year, three years before current fiscal year, finance receivable 50   50   187
Term loans by origination year, four years before current fiscal year, finance receivable 134   134   227
Term loans by origination year, more than five years before current fiscal year, finance receivable 174   174   72
Total loans 697   697   722
Auto [Member] | 90 days or more 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 5   5   10
Term loans by origination year, fiscal year before current fiscal year, finance receivable 17   17   5
Term loans by origination year, two years before current fiscal year, finance receivable 5   5   5
Term loans by origination year, three years before current fiscal year, finance receivable 4   4   16
Term loans by origination year, four years before current fiscal year, finance receivable 11   11   18
Term loans by origination year, more than five years before current fiscal year, finance receivable 14   14   6
Total loans $ 56   $ 56   $ 60