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Loans - Consumer Banking Portfolio by Credit Quality Indicator (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | $ 320,472 | $ 312,331
Consumer Banking: |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2023 | 23,828 | 31,969
2022 | 22,721 | 25,937
2021 | 17,192 | 11,591
2020 | 6,876 | 6,039
2019 | 3,053 | 2,589
Prior | 1,380 | 1,372
Total Term Loans | 75,050 | 79,497
Revolving Loans | 382 | 422
Revolving Loans Converted to Term | 5 | 6
Total | 75,437 | 79,925
Auto | Consumer Banking: |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2023 | 23,729 | 31,801
2022 | 22,564 | 25,807
2021 | 17,134 | 11,509
2020 | 6,810 | 5,906
2019 | 2,936 | 2,459
Prior | 902 | 891
Total Term Loans | 74,075 | 78,373
Revolving Loans | 0 | 0
Revolving Loans Converted to Term | 0 | 0
Total | 74,075 | 78,373
Retail banking | Consumer Banking: |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2023 | 99 | 168
2022 | 157 | 130
2021 | 58 | 82
2020 | 66 | 133
2019 | 117 | 130
Prior | 478 | 481
Total Term Loans | 975 | 1,124
Revolving Loans | 382 | 422
Revolving Loans Converted to Term | 5 | 6
Total | 1,362 | 1,552
Current | Retail banking | Consumer Banking: |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2023 | 98 | 166
2022 | 157 | 128
2021 | 57 | 82
2020 | 65 | 133
2019 | 117 | 127
Prior | 468 | 470
Total Term Loans | 962 | 1,106
Revolving Loans | 363 | 408
Revolving Loans Converted to Term | 4 | 4
Total | 1,329 | 1,518
30-59 days | Retail banking | Consumer Banking: |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2023 | 1 | 2
2022 | 0 | 1
2021 | 1 | 0
2020 | 1 | 0
2019 | 0 | 0
Prior | 1 | 2
Total Term Loans | 4 | 5
Revolving Loans | 11 | 8
Revolving Loans Converted to Term | 0 | 0
Total | 15 | 13
60-89 days | Retail banking | Consumer Banking: |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2023 | 0 | 0
2022 | 0 | 1
2021 | 0 | 0
2020 | 0 | 0
2019 | 0 | 0
Prior | 1 | 1
Total Term Loans | 1 | 2
Revolving Loans | 2 | 2
Revolving Loans Converted to Term | 0 | 0
Total | 3 | 4
Greater than 90 days | Retail banking | Consumer Banking: |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2023 | 0 | 0
2022 | 0 | 0
2021 | 0 | 0
2020 | 0 | 0
2019 | 0 | 3
Prior | 8 | 8
Total Term Loans | 8 | 11
Revolving Loans | 6 | 4
Revolving Loans Converted to Term | 1 | 2
Total | 15 | 17
Greater than 660 | Auto | Consumer Banking: |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2023 | 12,219 | 17,872
2022 | 12,593 | 14,246
2021 | 9,505 | 5,354
2020 | 3,124 | 2,595
2019 | 1,213 | 1,032
Prior | 309 | 328
Total Term Loans | 38,963 | 41,427
Revolving Loans | 0 | 0
Revolving Loans Converted to Term | 0 | 0
Total | 38,963 | 41,427
621-660 | Auto | Consumer Banking: |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2023 | 4,863 | 6,212
2022 | 4,432 | 5,060
2021 | 3,346 | 2,257
2020 | 1,337 | 1,167
2019 | 592 | 513
Prior | 192 | 185
Total Term Loans | 14,762 | 15,394
Revolving Loans | 0 | 0
Revolving Loans Converted to Term | 0 | 0
Total | 14,762 | 15,394
620 or below | Auto | Consumer Banking: |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2023 | 6,647 | 7,717
2022 | 5,539 | 6,501
2021 | 4,283 | 3,898
2020 | 2,349 | 2,144
2019 | 1,131 | 914
Prior | 401 | 378
Total Term Loans | 20,350 | 21,552
Revolving Loans | 0 | 0
Revolving Loans Converted to Term | 0 | 0
Total | $ 20,350 | $ 21,552

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