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Investment Securities (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Securities with no credit impairment in unrealized loss position	1,289
Loan interest receivable	$ 49	$ 36
Securities gains and losses	0	$ 0
Securities gains			$ 1
Securities losses			$ (1)
Carrying value of securities pledged	3,200
Pledged to the FHLB as collateral for potential future borrowings - investment securities	1,000
Collateral for potential future borrowings	2,200
Liabilities secured by pledged collateral	$ 1,000
U.S. Treasury and other U.S. government agency securities
Securities with no credit impairment in unrealized loss position	27
Residential mortgage-backed securities
Securities with no credit impairment in unrealized loss position	1,008
Commercial Mortgage Backed Securities
Securities with no credit impairment in unrealized loss position	254

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Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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