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Securitizations and Variable Interest Entities - Schedule of Quantitative Information and Net Credit Losses about Securitized and Other Financial Assets Managed Together (Details) - Off-balance sheet variable interest entities - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items] |  |  |  |  |
Total amount | $ 3,057 |  | $ 3,057 |  | $ 2,971
Amount 60 days or more past due | 125 |  | 125 |  | 115
Net credit losses | 33 | $ 35 | 92 | $ 97 |
Off-balance-sheet securitization entities | Automotive | Consumer |  |  |  |  |
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items] |  |  |  |  |
Total amount | 1,156 |  | 1,156 |  | 1,730
Amount 60 days or more past due | 17 |  | 17 |  | 22
Net credit losses | 5 | 6 | 13 | 14 |
Whole-loan sales | Automotive | Consumer |  |  |  |  |
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items] |  |  |  |  |
Total amount | 1,901 |  | 1,901 |  | 1,155
Amount 60 days or more past due | 108 |  | 108 |  | 83
Net credit losses | 28 | 22 | 72 | 54 |
Whole-loan sales | Other | Consumer |  |  |  |  |
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items] |  |  |  |  |
Total amount | 0 |  | 0 |  | 86
Amount 60 days or more past due | 0 |  | 0 |  | $ 10
Net credit losses | $ 0 | $ 7 | $ 7 | $ 29 |

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- Definition Amount of credit loss after recoveries for transferred financial assets that continue to be recognized in the statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (e)(5) -SubTopic 20 -Topic 860 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481326/860-20-50-4 + Details
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