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Loans - Consumer Banking Portfolio by Credit Quality Indicator (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | $ 315,154 | $ 320,472
Consumer Banking: |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term Loans by Vintage Year, Year 1 | 7,481 | 23,828
Term Loans by Vintage Year, Year 2 | 21,972 | 22,721
Term Loans by Vintage Year, Year 3 | 20,591 | 17,192
Term Loans by Vintage Year, Year 4 | 15,295 | 6,876
Term Loans by Vintage Year, Year 5 | 5,889 | 3,053
Prior | 3,495 | 1,380
Total Term Loans | 74,723 | 75,050
Revolving Loans | 370 | 382
Revolving Loans Converted to Term | 6 | 5
Total | 75,099 | 75,437
Auto | Consumer Banking: |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term Loans by Vintage Year, Year 1 | 7,412 | 23,729
Term Loans by Vintage Year, Year 2 | 21,895 | 22,564
Term Loans by Vintage Year, Year 3 | 20,499 | 17,134
Term Loans by Vintage Year, Year 4 | 15,238 | 6,810
Term Loans by Vintage Year, Year 5 | 5,826 | 2,936
Prior | 2,931 | 902
Total Term Loans | 73,801 | 74,075
Revolving Loans | 0 | 0
Revolving Loans Converted to Term | 0 | 0
Total | 73,801 | 74,075
Retail banking | Consumer Banking: |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term Loans by Vintage Year, Year 1 | 69 | 99
Term Loans by Vintage Year, Year 2 | 77 | 157
Term Loans by Vintage Year, Year 3 | 92 | 58
Term Loans by Vintage Year, Year 4 | 57 | 66
Term Loans by Vintage Year, Year 5 | 63 | 117
Prior | 564 | 478
Total Term Loans | 922 | 975
Revolving Loans | 370 | 382
Revolving Loans Converted to Term | 6 | 5
Total | 1,298 | 1,362
Current | Retail banking | Consumer Banking: |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term Loans by Vintage Year, Year 1 | 69 | 98
Term Loans by Vintage Year, Year 2 | 77 | 157
Term Loans by Vintage Year, Year 3 | 92 | 57
Term Loans by Vintage Year, Year 4 | 56 | 65
Term Loans by Vintage Year, Year 5 | 62 | 117
Prior | 554 | 468
Total Term Loans | 910 | 962
Revolving Loans | 355 | 363
Revolving Loans Converted to Term | 4 | 4
Total | 1,269 | 1,329
30-59 days | Retail banking | Consumer Banking: |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term Loans by Vintage Year, Year 1 | 0 | 1
Term Loans by Vintage Year, Year 2 | 0 | 0
Term Loans by Vintage Year, Year 3 | 0 | 1
Term Loans by Vintage Year, Year 4 | 1 | 1
Term Loans by Vintage Year, Year 5 | 0 | 0
Prior | 2 | 1
Total Term Loans | 3 | 4
Revolving Loans | 8 | 11
Revolving Loans Converted to Term | 0 | 0
Total | 11 | 15
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 | 2 | 2
Revolving Loans Converted to Term | 0 | 0
Total | 3 | 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 | 1 | 0
Prior | 7 | 8
Total Term Loans | 8 | 8
Revolving Loans | 5 | 6
Revolving Loans Converted to Term | 2 | 1
Total | 15 | 15
Greater than 660 | Auto | Consumer Banking: |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term Loans by Vintage Year, Year 1 | 4,180 | 12,219
Term Loans by Vintage Year, Year 2 | 11,141 | 12,593
Term Loans by Vintage Year, Year 3 | 11,433 | 9,505
Term Loans by Vintage Year, Year 4 | 8,457 | 3,124
Term Loans by Vintage Year, Year 5 | 2,654 | 1,213
Prior | 1,132 | 309
Total Term Loans | 38,997 | 38,963
Revolving Loans | 0 | 0
Revolving Loans Converted to Term | 0 | 0
Total | 38,997 | 38,963
621-660 | Auto | Consumer Banking: |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term Loans by Vintage Year, Year 1 | 1,367 | 4,863
Term Loans by Vintage Year, Year 2 | 4,526 | 4,432
Term Loans by Vintage Year, Year 3 | 4,030 | 3,346
Term Loans by Vintage Year, Year 4 | 2,974 | 1,337
Term Loans by Vintage Year, Year 5 | 1,148 | 592
Prior | 600 | 192
Total Term Loans | 14,645 | 14,762
Revolving Loans | 0 | 0
Revolving Loans Converted to Term | 0 | 0
Total | 14,645 | 14,762
620 or below | Auto | Consumer Banking: |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term Loans by Vintage Year, Year 1 | 1,865 | 6,647
Term Loans by Vintage Year, Year 2 | 6,228 | 5,539
Term Loans by Vintage Year, Year 3 | 5,036 | 4,283
Term Loans by Vintage Year, Year 4 | 3,807 | 2,349
Term Loans by Vintage Year, Year 5 | 2,024 | 1,131
Prior | 1,199 | 401
Total Term Loans | 20,159 | 20,350
Revolving Loans | 0 | 0
Revolving Loans Converted to Term | 0 | 0
Total | $ 20,159 | $ 20,350

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