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Fair Value Measures - Changes in Fair Value Included in Earnings - Fair Value Option (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Fair Value Disclosures [Abstract] |  |  |  |
Net gain on loan sales and securitizations | $ 5 | $ 63 | $ 18 | $ 78

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