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Fair Value Measures - Assets Measured at Fair Value on a Nonrecurring Basis (Details) - Nonrecurring - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Loans held for investment | $ 3,083 | $ 2,469
Loans held for sale | 286 | 335
Other assets | 32 | 52
Total assets at fair value | 3,401 | 2,856
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Loans held for investment | 0 | 0
Loans held for sale | 0 | 0
Other assets | 0 | 0
Total assets at fair value | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Loans held for investment | 0 | 0
Loans held for sale | 286 | 335
Other assets | 0 | 0
Total assets at fair value | 286 | 335
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Loans held for investment | 3,083 | 2,469
Loans held for sale | 0 | 0
Other assets | 32 | 52
Total assets at fair value | $ 3,115 | $ 2,521

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