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Finance Receivables and Loans, Net - Schedule of Accounts, Notes, Loans and Financing Receivables (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2025 | Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total finance receivables and loans | $ 134,567 | $ 134,567 | $ 136,030
Unamortized premiums and discounts and deferred fees and costs | 2,400 | 2,400 | 2,300
Accrued interest receivable | 761 | 761 | 839
Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total finance receivables and loans | 101,247 | 101,247 | 103,285
Consumer | Automotive |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total finance receivables and loans | 84,994 | 84,994 | 83,757
Consumer | Consumer mortgage finance receivables |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total finance receivables and loans | 16,253 | 16,253 | 17,234
Interest-only mortgage loans | 5 | 5 | 12
Consumer | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total finance receivables and loans | 0 | 0 | 2,294
Commercial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total finance receivables and loans | 33,320 | 33,320 | 32,745
Commercial | Automotive |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total finance receivables and loans | 17,137 | 17,137 | 18,259
Commercial | Consumer mortgage finance receivables |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total finance receivables and loans | 7,014 | 7,014 | 6,274
Commercial | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total finance receivables and loans | 9,169 | 9,169 | $ 8,212
Financing receivable, purchased with credit deterioration, amount | 26 |  |
Cash considerations | 2 |  |
Financing receivable, excluding accrued interest, purchased with credit deterioration, allowance for credit loss at acquisition date | $ 24 | $ 24 |

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