Loans and Leases - Schedule of Amortized Cost of Loans (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total net unamortized discount	$ 142	$ 40
Non-PCD
Accounts, Notes, Loans and Financing Receivable [Line Items]
Deferred fees, including unearned fees and unamortized costs on non-PCD loans	38	32
Total net unamortized discount	75	11
PCD
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total net unamortized discount	$ 67	$ 29