Loans and Leases - Schedule of Troubled Debt Restructuring (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing	$ 154	$ 146
Non-Accruing	49	46
Total	203	192
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing	105	97
Non-Accruing	25	21
Total	130	118
Commercial | Commercial construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing	2	2
Non-Accruing	1	0
Total	3	2
Commercial | Owner occupied commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing	50	57
Non-Accruing	8	8
Total	58	65
Commercial | Non-owner occupied commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing	28	26
Non-Accruing	2	3
Total	30	29
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing	25	12
Non-Accruing	13	9
Total	38	21
Commercial | Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing	0	0
Non-Accruing	1	1
Total	1	1
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing	49	49
Non-Accruing	24	25
Total	73	74
Consumer | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing	28	29
Non-Accruing	19	18
Total	47	47
Consumer | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing	18	17
Non-Accruing	5	7
Total	23	24
Consumer | Consumer auto
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing	2	2
Non-Accruing	0	0
Total	2	2
Consumer | Consumer other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing	1	1
Non-Accruing	0	0
Total	$ 1	$ 1