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Investment Securities (Fair Value of Securities Pledged and Accepted as Collateral) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Summary of Investment Holdings [Line Items]
Permitted by contract or custom to sell or repledge	$ 946	$ 1,266
Permitted amount repledged to others	946	1,266
Asset Pledged as Collateral
Summary of Investment Holdings [Line Items]
Debt securities, pledged to others	$ 27,462	$ 24,708

X

- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity) and investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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Fair value of collateral permitted, by contact or custom, to be sold or re-pledged.

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Fair value of the collateral, or portion thereof, that has been re-pledged, delivered, or otherwise used.

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