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Investment Securities Available for Sale (Narrative) (Details) | Sep. 30, 2023 USD ($) security | Dec. 31, 2022 USD ($)
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Investment securities in a loss position for less than twelve months | security | 26 |
Investment securities in a loss position for twelve months or longer | security | 413 |
Allowance for credit loss | $ | $ 0 |
Collateral Pledged |  |
Financing Receivable, Impaired [Line Items] |  |
Pledged to secure deposits | $ | $ 4,540,000,000 | $ 4,470,000,000

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