Credit Quality and the Allowance for Loan and Lease Losses - Summary of Subsequent Defaults (Details) $ in Millions	3 Months Ended
	Mar. 31, 2023 contract	Mar. 31, 2022 USD ($) contract
Financing Receivable, Modifications
Number of Contracts | contract	0	175
Amortized Cost | $		$ 5
Commercial | Commercial and industrial loans
Financing Receivable, Modifications
Number of Contracts | contract		6
Amortized Cost | $		$ 0
Residential Mortgage
Financing Receivable, Modifications
Number of Contracts | contract		29
Amortized Cost | $		$ 3
Consumer | Home equity
Financing Receivable, Modifications
Number of Contracts | contract		10
Amortized Cost | $		$ 1
Consumer | Indirect secured consumer loans
Financing Receivable, Modifications
Number of Contracts | contract		25
Amortized Cost | $		$ 0
Consumer | Credit card
Financing Receivable, Modifications
Number of Contracts | contract		105
Amortized Cost | $		$ 1