Outstanding Loans and Leases and Allowance for Credit Losses - Credit Quality Indicators, Narrative (Details) - USD ($) $ in Billions	Mar. 31, 2023	Dec. 31, 2022
Receivables [Abstract]
Commercial reservable criticized utilized exposure, amount	$ 19.8	$ 19.3
Commercial reservable criticized utilized exposure, percent	3.17%	3.12%