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Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Gains from sale of other real estate classified as OREO | $ 6 |  | $ 6 |
Gain resulting from observable price changes | 0 | $ 2 | 4 | $ 11
Positive adjustments, cumulative amount | 23 |  | 23 |
Private equity, impairment | 0 | $ 0 | 0 | 0
Private equity, cumulative impairment | $ 15 |  | 15 |
Residential Mortgage |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair value changes included in earnings for instruments for which the fair value option was elected |  |  | $ (24) | $ 2

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- Definition Amount of gain from upward price adjustment on investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-3 + Details
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