Loans and Leases - Schedule of Amortized Cost of Loans (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total net unamortized discount	$ 2,197	$ 118
Non-PCD
Accounts, Notes, Loans and Financing Receivable [Line Items]
Deferred (fees) costs, including unamortized costs and unearned fees on non-PCD loans	(39)	34
Total net unamortized discount	1,986	73
PCD
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total net unamortized discount	$ 211	$ 45