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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

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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/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 3B -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447 + Details
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