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Debt Securities (Narrative) (Details) $ in Millions | Sep. 30, 2023 USD ($) security | Dec. 31, 2022 USD ($) security
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities available for sale | $ 26,228 | $ 27,933
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security | 1,842 | 1,806
Asset Pledged as Collateral |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities available for sale | $ 23,300 | $ 8,800

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