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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 | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |
Loans Held for Sale | $ 232 |  | $ 184
Fair Value Option Mortgages Held For Sale Aggregate Unpaid Principal | 227 |  | $ 177
Net gains (losses) resulting from changes in fair value | $ (2) | $ 2 |

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