Loans and Leases - Collateral-Dependent Loans Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 58,102,000,000	$ 54,859,000,000
Financing receivable, allowance for credit loss, writeoff, collateral	2,000,000	1,000,000
Commercial | Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	124,000,000	120,000,000
Commercial | C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	31,781,000,000	31,068,000,000
Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	13,228,000,000	12,109,000,000
C&I | Asset Pledged as Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, allowance for credit loss, writeoff, collateral	10,000,000	26,000,000
C&I | Commercial | C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	29,523,000,000	26,550,000,000
C&I | Commercial | C&I | Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	116,000,000
CRE | Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	13,228,000,000	12,109,000,000
CRE | Commercial | Commercial real estate | Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	8,000,000
HELOC | Asset Pledged as Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	7,000,000	7,000,000
Real estate installment loans | Asset Pledged as Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 26,000,000	$ 20,000,000