Loans, Leases, and Allowance for Credit Losses (Summary of Accrued Interest Receivables Reversed) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Financing Receivable, Past Due [Line Items]
Accrued interest receivable written off	$ 6	$ 4	$ 11	$ 6
Commercial
Financing Receivable, Past Due [Line Items]
Accrued interest receivable written off	4	3	6	5
Commercial real estate
Financing Receivable, Past Due [Line Items]
Accrued interest receivable written off	1	0	3	0
Consumer
Financing Receivable, Past Due [Line Items]
Accrued interest receivable written off	$ 1	$ 1	$ 2	$ 1