Loans and Leases - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest	$ 287	$ 226
Net loans and leases	60,519	57,417
Loans and leases	61,292	58,102
Post-Modification Outstanding Recorded Investment	$ 28	85
TDR loans balance		180
Held for sale
Accounts, Notes, Loans and Financing Receivable [Line Items]
TDR loans balance		30
Commercial | Minimum | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan grades	1
Commercial | Maximum | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loan grades	16
Commercial | C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 32,633	31,781
Commercial | Loans to mortgage companies
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	2,019	2,258
Loans to mortgage companies | Commercial | C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	2,019	2,258
Finance And Insurance Companies | Commercial | C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 4,100
Percentage of loans sensitive to impacts on financial services industry	18.00%
Asset Pledged as Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net loans and leases	$ 46,100	$ 38,300