Loans and Leases - Modifications to Borrowers Experiencing Financial Difficulty (Details) $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($)
Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance	$ 96
% of Total Class	0.002
Payment Deferrals
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance	$ 4
% of Total Class	0
Combination - Term Extension and Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance	$ 2
% of Total Class	0
Combination - Principal Forgiveness and Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance	$ 18
% of Total Class	0
Commercial: | Commercial and industrial | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance	$ 63
% of Total Class	0.002
Weighted average life of loans	1 year
Commercial: | Commercial and industrial | Payment Deferrals
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance	$ 0
% of Total Class	0
Commercial: | Commercial and industrial | Combination - Term Extension and Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance	$ 0
% of Total Class	0
Commercial: | Commercial and industrial | Combination - Principal Forgiveness and Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance	$ 18
% of Total Class	0.001
Weighted average life of loans	6 years 2 months 12 days
Decrease from Loans modification	$ 2
Commercial: | Commercial real estate | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance	$ 32
% of Total Class	0.002
Weighted average life of loans	7 months 6 days
Commercial: | Commercial real estate | Payment Deferrals
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance	$ 0
% of Total Class	0
Commercial: | Commercial real estate | Combination - Term Extension and Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance	$ 0
% of Total Class	0
Commercial: | Commercial real estate | Combination - Principal Forgiveness and Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance	$ 0
% of Total Class	0
Consumer: | Consumer Real Estate | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance	$ 1
% of Total Class	0
Weighted average life of loans	14 years 10 months 24 days
Consumer: | Consumer Real Estate | Payment Deferrals
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance	$ 4
% of Total Class	0
Weighted average life of loans	11 months
Consumer: | Consumer Real Estate | Combination - Term Extension and Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance	$ 2
% of Total Class	0
Weighted average life of loans	8 years 9 months 18 days
Consumer: | Consumer Real Estate | Combination - Term Extension and Interest Rate Reduction | Maximum
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted average interest rate of loans	0.050
Consumer: | Consumer Real Estate | Combination - Term Extension and Interest Rate Reduction | Minimum
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted average interest rate of loans	0.049
Consumer: | Consumer Real Estate | Combination - Principal Forgiveness and Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance	$ 0
% of Total Class	0
Consumer: | Credit Card and Other | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance	$ 0
% of Total Class	0
Consumer: | Credit Card and Other | Payment Deferrals
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance	$ 0
% of Total Class	0
Consumer: | Credit Card and Other | Combination - Term Extension and Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance	$ 0
% of Total Class	0
Consumer: | Credit Card and Other | Combination - Principal Forgiveness and Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance	$ 0
% of Total Class	0