Investment Securities (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Schedule of Investments [Line Items]
Loan interest receivable	$ 37		$ 37		$ 40
Securities gains and losses	0	$ 0	0	$ 0
Carrying value of securities pledged	7,500		7,500
Pledged to the FHLB as collateral for potential future borrowings	6,200		6,200
Collateral for potential future borrowings	1,300		1,300
Liabilities secured by pledged collateral	$ 378		$ 378