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Loans - Consumer Banking Portfolio by Credit Quality Indicator (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]    
Total $ 443,159 $ 327,775
Consumer Banking:    
Financing Receivable, Credit Quality Indicator [Line Items]    
Term Loans by Vintage Year, Year 1 28,608 30,886
Term Loans by Vintage Year, Year 2 23,856 16,785
Term Loans by Vintage Year, Year 3 12,099 14,819
Term Loans by Vintage Year, Year 4 9,890 10,202
Term Loans by Vintage Year, Year 5 6,114 3,408
Prior 2,311 1,623
Total Term Loans 82,878 77,723
Revolving Loans 349 365
Revolving Loans Converted to Term 3 4
Total 83,230 78,092
Auto | Consumer Banking:    
Financing Receivable, Credit Quality Indicator [Line Items]    
Term Loans by Vintage Year, Year 1 28,525 30,743
Term Loans by Vintage Year, Year 2 23,727 16,707
Term Loans by Vintage Year, Year 3 12,028 14,726
Term Loans by Vintage Year, Year 4 9,809 10,153
Term Loans by Vintage Year, Year 5 6,072 3,356
Prior 1,874 1,144
Total Term Loans 82,035 76,829
Revolving Loans 0 0
Revolving Loans Converted to Term 0 0
Total 82,035 76,829
Retail banking | Consumer Banking:    
Financing Receivable, Credit Quality Indicator [Line Items]    
Term Loans by Vintage Year, Year 1 83 143
Term Loans by Vintage Year, Year 2 129 78
Term Loans by Vintage Year, Year 3 71 93
Term Loans by Vintage Year, Year 4 81 49
Term Loans by Vintage Year, Year 5 42 52
Prior 437 479
Total Term Loans 843 894
Revolving Loans 349 365
Revolving Loans Converted to Term 3 4
Total 1,195 1,263
Current | Retail banking | Consumer Banking:    
Financing Receivable, Credit Quality Indicator [Line Items]    
Term Loans by Vintage Year, Year 1 83 143
Term Loans by Vintage Year, Year 2 129 78
Term Loans by Vintage Year, Year 3 71 93
Term Loans by Vintage Year, Year 4 81 49
Term Loans by Vintage Year, Year 5 42 51
Prior 433 469
Total Term Loans 839 883
Revolving Loans 338 351
Revolving Loans Converted to Term 3 3
Total 1,180 1,237
30-59 days | Retail banking | Consumer Banking:    
Financing Receivable, Credit Quality Indicator [Line Items]    
Term Loans by Vintage Year, Year 1 0 0
Term Loans by Vintage Year, Year 2 0 0
Term Loans by Vintage Year, Year 3 0 0
Term Loans by Vintage Year, Year 4 0 0
Term Loans by Vintage Year, Year 5 0 0
Prior 2 2
Total Term Loans 2 2
Revolving Loans 9 11
Revolving Loans Converted to Term 0 0
Total 11 13
60-89 days | Retail banking | Consumer Banking:    
Financing Receivable, Credit Quality Indicator [Line Items]    
Term Loans by Vintage Year, Year 1 0 0
Term Loans by Vintage Year, Year 2 0 0
Term Loans by Vintage Year, Year 3 0 0
Term Loans by Vintage Year, Year 4 0 0
Term Loans by Vintage Year, Year 5 0 0
Prior 1 1
Total Term Loans 1 1
Revolving Loans 1 2
Revolving Loans Converted to Term 0 0
Total 2 3
Greater than 90 days | Retail banking | Consumer Banking:    
Financing Receivable, Credit Quality Indicator [Line Items]    
Term Loans by Vintage Year, Year 1 0 0
Term Loans by Vintage Year, Year 2 0 0
Term Loans by Vintage Year, Year 3 0 0
Term Loans by Vintage Year, Year 4 0 0
Term Loans by Vintage Year, Year 5 0 1
Prior 1 7
Total Term Loans 1 8
Revolving Loans 1 1
Revolving Loans Converted to Term 0 1
Total 2 10
Greater than 660 | Auto | Consumer Banking:    
Financing Receivable, Credit Quality Indicator [Line Items]    
Term Loans by Vintage Year, Year 1 13,606 17,057
Term Loans by Vintage Year, Year 2 12,853 8,333
Term Loans by Vintage Year, Year 3 5,902 8,194
Term Loans by Vintage Year, Year 4 5,413 5,621
Term Loans by Vintage Year, Year 5 3,323 1,482
Prior 742 394
Total Term Loans 41,839 41,081
Revolving Loans 0 0
Revolving Loans Converted to Term 0 0
Total 41,839 41,081
621-660 | Auto | Consumer Banking:    
Financing Receivable, Credit Quality Indicator [Line Items]    
Term Loans by Vintage Year, Year 1 5,201 5,584
Term Loans by Vintage Year, Year 2 4,385 3,492
Term Loans by Vintage Year, Year 3 2,537 2,906
Term Loans by Vintage Year, Year 4 1,951 1,986
Term Loans by Vintage Year, Year 5 1,198 667
Prior 375 235
Total Term Loans 15,647 14,870
Revolving Loans 0 0
Revolving Loans Converted to Term 0 0
Total 15,647 14,870
620 or below | Auto | Consumer Banking:    
Financing Receivable, Credit Quality Indicator [Line Items]    
Term Loans by Vintage Year, Year 1 9,718 8,102
Term Loans by Vintage Year, Year 2 6,489 4,882
Term Loans by Vintage Year, Year 3 3,589 3,626
Term Loans by Vintage Year, Year 4 2,445 2,546
Term Loans by Vintage Year, Year 5 1,551 1,207
Prior 757 515
Total Term Loans 24,549 20,878
Revolving Loans 0 0
Revolving Loans Converted to Term 0 0
Total $ 24,549 $ 20,878