Loans and Leases - Performance Of Loans That Have Been Modified In The Last 12 Months (Details) $ in Millions	Mar. 31, 2023 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Non-Accruing	$ 24
Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans and leases	96
30-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans and leases	0
90+ Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans and leases	0
Commercial: | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Non-Accruing	18
Commercial: | Commercial and industrial | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans and leases	63
Commercial: | Commercial and industrial | 30-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans and leases	0
Commercial: | Commercial and industrial | 90+ Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans and leases	0
Commercial: | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Non-Accruing	0
Commercial: | Commercial real estate | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans and leases	32
Commercial: | Commercial real estate | 30-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans and leases	0
Commercial: | Commercial real estate | 90+ Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans and leases	0
Consumer: | Consumer Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Non-Accruing	6
Consumer: | Consumer Real Estate | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans and leases	1
Consumer: | Consumer Real Estate | 30-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans and leases	0
Consumer: | Consumer Real Estate | 90+ Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans and leases	0
Consumer: | Credit Card and Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Non-Accruing	0
Consumer: | Credit Card and Other | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans and leases	0
Consumer: | Credit Card and Other | 30-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans and leases	0
Consumer: | Credit Card and Other | 90+ Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans and leases	$ 0