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Debt Securities (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($) security	Dec. 31, 2023 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Debt securities available for sale	$ 27,881	$ 28,104
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	1,738	1,703
Debt Securities, Available-for-sale, Realized Gain	$ 0
Debt Securities, Available-for-Sale, Realized Loss	50
Asset Pledged as Collateral
Debt Securities, Available-for-sale [Line Items]
Debt securities available for sale	$ 19,700	$ 24,000

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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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