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Debt Securities (Narrative) (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 USD ($) security | Dec. 31, 2021 USD ($) security
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security | 1,806 | 479
Debt securities available for sale | $ 27,933 | $ 28,481
Document Fiscal Year Focus | 2022 |
Asset Pledged as Collateral |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities available for sale | $ 8,800 | $ 9,200

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