Loans and Leases - Performance Of Loans That Have Been Modified In The Last 12 Months (Details) $ in Millions	Dec. 31, 2023 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing	$ 80
Financial Asset, Not Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	82
30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0
90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0
Commercial | C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing	22
Commercial | C&I | Financial Asset, Not Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	70
Commercial | C&I | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0
Commercial | C&I | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0
Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing	47
Commercial | Commercial real estate | Financial Asset, Not Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	8
Commercial | Commercial real estate | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0
Commercial | Commercial real estate | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0
Consumer | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing	11
Consumer | Consumer real estate | Financial Asset, Not Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	4
Consumer | Consumer real estate | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0
Consumer | Consumer real estate | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0
Consumer | Credit card and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accruing	0
Consumer | Credit card and other | Financial Asset, Not Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0
Consumer | Credit card and other | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0
Consumer | Credit card and other | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 0