Loans and Leases - Schedule of Troubled Debt Restructuring (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing	$ 151	$ 146
Non-Accruing	52	46
Total	203	192
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing	103	97
Non-Accruing	28	21
Total	131	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	54	57
Non-Accruing	9	8
Total	63	65
Commercial | Non-owner occupied commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing	24	26
Non-Accruing	4	3
Total	28	29
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing	23	12
Non-Accruing	13	9
Total	36	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	48	49
Non-Accruing	24	25
Total	72	74
Consumer | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing	28	29
Non-Accruing	18	18
Total	46	47
Consumer | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing	17	17
Non-Accruing	6	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