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Finance Receivables and Loans, Net - Schedule of Financing Receivables, Nonaccrual Status (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Receivables [Abstract] |  |  |  |
Financing receivable, nonaccrual, interest income | $ 4 | $ 5 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivable, recorded investment, nonaccrual status | 1,417 |  | $ 1,486 | $ 1,394
Financing receivable, nonaccrual, with no allowance | 502 |  | 518 |
Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivable, recorded investment, nonaccrual status | 1,223 |  | 1,375 | 1,275
Financing receivable, nonaccrual, with no allowance | 487 |  | 512 |
Consumer | Automotive |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivable, recorded investment, nonaccrual status | 1,167 |  | 1,231 | 1,129
Financing receivable, nonaccrual, with no allowance | 449 |  | 476 |
Consumer | Consumer mortgage finance receivables |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivable, recorded investment, nonaccrual status | 56 |  | 54 | 54
Financing receivable, nonaccrual, with no allowance | 38 |  | 36 |
Consumer | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivable, recorded investment, nonaccrual status | 0 |  | 90 | 92
Financing receivable, nonaccrual, with no allowance | 0 |  | 0 |
Commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivable, recorded investment, nonaccrual status | 194 |  | 111 | 119
Financing receivable, nonaccrual, with no allowance | 15 |  | 6 |
Commercial | Automotive |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivable, recorded investment, nonaccrual status | 79 |  | 15 | 18
Financing receivable, nonaccrual, with no allowance | 3 |  | 0 |
Commercial | Consumer mortgage finance receivables |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivable, recorded investment, nonaccrual status | 21 |  | 2 | 3
Financing receivable, nonaccrual, with no allowance | 9 |  | 2 |
Commercial | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivable, recorded investment, nonaccrual status | 94 |  | 94 | $ 98
Financing receivable, nonaccrual, with no allowance | $ 3 |  | $ 4 |

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