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Finance Receivables and Loans, Net - Schedule of Financing Receivables, Nonaccrual Status (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Dec. 31, 2023
Receivables [Abstract] |  |  |  |  |  |  |  |
Financing receivable, nonaccrual, interest income | $ 4 | $ 4 | $ 11 | $ 14 |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing receivable, recorded investment, nonaccrual status | 1,353 |  | 1,353 |  | $ 1,359 | $ 1,486 | $ 1,215 | $ 1,394
Financing receivable, nonaccrual, with no allowance | 500 |  | 500 |  |  | 518 |  |
Consumer |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing receivable, recorded investment, nonaccrual status | 1,210 |  | 1,210 |  | 1,203 | 1,375 | 1,099 | 1,275
Financing receivable, nonaccrual, with no allowance | 479 |  | 479 |  |  | 512 |  |
Consumer | Automotive |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing receivable, recorded investment, nonaccrual status | 1,140 |  | 1,140 |  | 1,134 | 1,231 | 978 | 1,129
Financing receivable, nonaccrual, with no allowance | 426 |  | 426 |  |  | 476 |  |
Consumer | Consumer mortgage finance receivables |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing receivable, recorded investment, nonaccrual status | 70 |  | 70 |  | 69 | 54 | 41 | 54
Financing receivable, nonaccrual, with no allowance | 53 |  | 53 |  |  | 36 |  |
Consumer | Other |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing receivable, recorded investment, nonaccrual status | 0 |  | 0 |  | 0 | 90 | 80 | 92
Financing receivable, nonaccrual, with no allowance | 0 |  | 0 |  |  | 0 |  |
Commercial |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing receivable, recorded investment, nonaccrual status | 143 |  | 143 |  | 156 | 111 | 116 | 119
Financing receivable, nonaccrual, with no allowance | 21 |  | 21 |  |  | 6 |  |
Commercial | Automotive |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing receivable, recorded investment, nonaccrual status | 9 |  | 9 |  | 38 | 15 | 18 | 18
Financing receivable, nonaccrual, with no allowance | 9 |  | 9 |  |  | 0 |  |
Commercial | Consumer mortgage finance receivables |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing receivable, recorded investment, nonaccrual status | 10 |  | 10 |  | 20 | 2 | 2 | 3
Financing receivable, nonaccrual, with no allowance | 8 |  | 8 |  |  | 2 |  |
Commercial | Other |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing receivable, recorded investment, nonaccrual status | 124 |  | 124 |  | $ 98 | 94 | $ 96 | $ 98
Financing receivable, nonaccrual, with no allowance | $ 4 |  | $ 4 |  |  | $ 4 |  |

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