Credit Quality and the Allowance for Loan and Lease Losses - Summary of Subsequent Defaults (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2022 USD ($) contract	Sep. 30, 2022 USD ($) contract
Financing Receivable, Modifications
Number of Contracts | contract	203	563
Amortized Cost Basis | $	$ 11	$ 29
Commercial | Commercial and industrial loans
Financing Receivable, Modifications
Number of Contracts | contract	1	8
Amortized Cost Basis | $	$ 0	$ 0
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	70	176
Amortized Cost Basis | $	$ 11	$ 24
Consumer | Home equity
Financing Receivable, Modifications
Number of Contracts | contract	6	21
Amortized Cost Basis | $	$ 0	$ 1
Consumer | Indirect secured consumer loans
Financing Receivable, Modifications
Number of Contracts | contract	43	102
Amortized Cost Basis | $	$ 0	$ 1
Consumer | Credit card
Financing Receivable, Modifications
Number of Contracts | contract	83	255
Amortized Cost Basis | $	$ 0	$ 1