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Investment Securities (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Schedule of Investments [Line Items]
Loan interest receivable	$ 36		$ 36		$ 40
Floating rate securities	3		3		$ 4
Securities gains and losses	0	$ 0	0	$ 0
Carrying value of securities pledged	7,300		7,300
Pledged to the FHLB as collateral for potential future borrowings	6,400		6,400
Collateral for potential future borrowings	924		924
Liabilities secured by pledged collateral	$ 375		$ 375

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