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Debt Securities (Narrative) (Details) $ in Millions	Dec. 31, 2023 USD ($) security	Dec. 31, 2022 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Debt securities available for sale	$ 28,104	$ 27,933
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	1,703	1,806
Asset Pledged as Collateral
Debt Securities, Available-for-sale [Line Items]
Debt securities available for sale	$ 24,000	$ 8,800

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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