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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 | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Loans Held for Sale | $ 195 |  | $ 195 |  | $ 160
Fair Value Option Mortgages Held For Sale Aggregate Unpaid Principal | 193 |  | 193 |  | $ 157
Net gains (losses) resulting from changes in fair value | $ (2) | $ (11) | $ (1) | $ (27) |

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