Loans and Leases - Summary of Interest Income on Non accrual loans (Details) - Non-Covered Loans - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income that would have been recorded	$ 3	$ 5	$ 5
Interest income actually recorded	(1)	(1)	(3)
Interest income foregone	$ 2	$ 4	$ 2