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Fair Value Measurements (Fair Value Option, Fair Value and Unpaid Principal Balance) (Details) - Mortgage loans held for sale [Member] - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Loans Held for Sale | $ 253 | $ 222
Fair Value Option Mortgages Held For Sale Aggregate Unpaid Principal | $ 247 | $ 219

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