Credit Quality and the Allowance for Loan and Lease Losses - Summary of Subsequent Defaults (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2022 USD ($) contract	Jun. 30, 2022 USD ($) contract
Financing Receivable, Modifications
Number of Contracts | contract	188	360
Amortized Cost Basis | $	$ 13	$ 18
Commercial | Commercial and industrial loans
Financing Receivable, Modifications
Number of Contracts | contract	1	7
Amortized Cost Basis | $	$ 0	$ 0
Commercial | Commercial construction loans
Financing Receivable, Modifications
Number of Contracts | contract	1	1
Amortized Cost Basis | $	$ 2	$ 2
Residential Mortgage
Financing Receivable, Modifications
Number of Contracts | contract	77	106
Amortized Cost Basis | $	$ 10	$ 13
Consumer | Home equity
Financing Receivable, Modifications
Number of Contracts | contract	8	15
Amortized Cost Basis | $	$ 0	$ 1
Consumer | Indirect secured consumer loans
Financing Receivable, Modifications
Number of Contracts | contract	34	59
Amortized Cost Basis | $	$ 1	$ 1
Consumer | Credit card
Financing Receivable, Modifications
Number of Contracts | contract	67	172
Amortized Cost Basis | $	$ 0	$ 1