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Loans and Leases - Collateral-Dependent Loans Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | $ 61,292 | $ 58,102
Financing receivable, allowance for credit loss, writeoff, collateral | 1 | 2
Commercial | Collateral Pledged |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 250 | 124
Commercial | C&I |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 32,633 | 31,781
Commercial | Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 14,216 | 13,228
C&I | Asset Pledged as Collateral |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivable, allowance for credit loss, writeoff, collateral | 144 | 10
C&I | Commercial | C&I |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 30,614 | 29,523
C&I | Commercial | C&I | Collateral Pledged |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 117 |
CRE | Commercial | Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 14,216 | 13,228
CRE | Commercial | Commercial real estate | Collateral Pledged |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 133 |
HELOC | Asset Pledged as Collateral |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 6 | 7
Real estate installment loans | Asset Pledged as Collateral |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | $ 27 | $ 26

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- Definition Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-5 + Details
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