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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, 2024 | Dec. 31, 2023
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Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Loans Held for Sale | $ 248 | $ 184
Fair Value Option Mortgages Held For Sale Aggregate Unpaid Principal | $ 243 | $ 177

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