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Investment Securities (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Schedule of Investments [Line Items]
Loan interest receivable	$ 37		$ 38
Floating rate securities	3	$ 3
Securities gains and losses	0	$ 0
Carrying value of securities pledged	7,700
Pledged to the FHLB as collateral for potential future borrowings	5,900
Collateral for potential future borrowings	1,800
Liabilities secured by pledged collateral	$ 435

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