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Debt Securities (Narrative) (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2024 USD ($) security	Jun. 30, 2024 USD ($) security	Dec. 31, 2023 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Debt securities available for sale	$ 28,537	$ 28,537	$ 28,104
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	1,752	1,752	1,703
Debt Securities, Available-for-sale, Realized Gain	$ 0	$ 0
Debt Securities, Available-for-Sale, Realized Loss	50	100
Asset Pledged as Collateral
Debt Securities, Available-for-sale [Line Items]
Debt securities available for sale	$ 18,100	$ 18,100	$ 24,000

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