Loans, Leases, and Allowance for Credit Losses (Summary of Accrued Interest Receivables Reversed) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Financing Receivable, Past Due [Line Items]
Accrued interest receivable written off	$ 3	$ 4
Commercial
Financing Receivable, Past Due [Line Items]
Accrued interest receivable written off	2	4
Commercial real estate
Financing Receivable, Past Due [Line Items]
Accrued interest receivable written off	1	0
Consumer
Financing Receivable, Past Due [Line Items]
Accrued interest receivable written off	$ 0	$ 0