Credit Quality and the Allowance for Loan and Lease Losses - Summary of Subsequent Defaults (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) contract	Dec. 31, 2021 USD ($) contract
Financing Receivable, Modifications
Number of Contracts | contract	796	467
Amortized Cost Basis | $	$ 40	$ 41
Commercial | Commercial and industrial loans
Financing Receivable, Modifications
Number of Contracts | contract	8	7
Amortized Cost Basis | $	$ 0	$ 1
Commercial | Commercial mortgage owner-occupied loans
Financing Receivable, Modifications
Number of Contracts | contract	2	3
Amortized Cost Basis | $	$ 0	$ 1
Commercial | Commercial mortgage nonowner-occupied loans
Financing Receivable, Modifications
Number of Contracts | contract	1	2
Amortized Cost Basis | $	$ 0	$ 25
Commercial | Commercial construction loans
Financing Receivable, Modifications
Number of Contracts | contract	1
Amortized Cost Basis | $	$ 2
Residential Mortgage
Financing Receivable, Modifications
Number of Contracts | contract	247	82
Amortized Cost Basis | $	$ 33	$ 10
Consumer | Home equity
Financing Receivable, Modifications
Number of Contracts | contract	24	28
Amortized Cost Basis | $	$ 1	$ 1
Consumer | Indirect secured consumer loans
Financing Receivable, Modifications
Number of Contracts | contract	157	130
Amortized Cost Basis | $	$ 3	$ 2
Consumer | Credit card
Financing Receivable, Modifications
Number of Contracts | contract	356	215
Amortized Cost Basis | $	$ 1	$ 1