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v3.25.3

Summary of Significant Accounting Policies - Narrative (Details) $ in Millions |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 24, 2025 USD ($) loanPurchaser | Sep. 30, 2025 USD ($) facility | Sep. 30, 2025 USD ($) segment facility | Oct. 28, 2025 USD ($) | Apr. 29, 2025 USD ($) | Jan. 03, 2025 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Number of operating segments | segment |  |  | 1 |  |  |
Number of reportable segments | segment |  |  | 1 |  |  |
Loan Purchase Agreement | Consumer Loan | Subsequent Event |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Number of third party loan purchasers | loanPurchaser | 2 |  |  |  |  |
Loan Purchase Agreement | Consumer Loan | Subsequent Event | Purchase Finance Receivables through October 2027 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Transfer of financial assets accounted for as sales, new total eligible amount to be sold | $ 4,000 |  |  |  |  |
Loan Purchase Agreement | Consumer Loan | Subsequent Event | Purchase Finance Receivables through December 2027 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Transfer of financial assets accounted for as sales, new total eligible amount to be sold | $ 4,000 |  |  |  |  |
MPSA | Consumer Loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Transfer of financial assets accounted for as sales, new total eligible amount to be sold |  |  |  |  | $ 4,000 | $ 4,000
MPSA | Consumer Loan | Subsequent Event | Ally Parties |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Transfer of financial assets accounted for as sales, new total eligible amount to be sold |  |  |  | $ 6,000 |  |
Revolving Credit Facility | Line of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Number of instruments extended and upsized | facility |  | 2 | 2 |  |  |
Line of credit facility, maximum borrowing capacity (up to) |  | $ 600 | $ 600 |  |  |
2028 Senior Secured Notes | Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, redeemed during period |  | $ 559 |  |  |  |

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