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Investment Securities (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Schedule of Investments [Line Items]
Loan interest receivable	$ 41		$ 41		$ 49
Securities gains and losses	0	$ 0	0	$ 0
Carrying value of securities pledged	15,800		15,800
Federal reserve bank pledges	7,500		7,500
Pledged to the FHLB as collateral for potential future borrowings	6,400		6,400
Collateral for potential future borrowings	1,900		1,900
Liabilities secured by pledged collateral	$ 536		$ 536

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Federal Reserve Bank Pledges

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