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Allowance for Credit Losses on Loans and Leases - Narrative (Details) - USD ($) $ in Millions |  | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 20, 2023 | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Dec. 31, 2021
Financing Receivable, Allowance for Credit Losses |  |  |  |  |
Allowance for credit losses on loans and leases |  | $ 619 | $ 393 | $ 218 | $ 199
Increase in allowance for credit losses |  | 226 |  |  |
Macroeconomic Impact |  |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |  |
Increase in allowance for credit losses |  | 88 |  |  |
Signature Bridge Bank |  |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |  |
Increase in allowance for credit losses | $ 138 |  |  |  |
Unfunded Loan Commitment |  |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |  |
Allowance for credit losses on loans and leases |  | $ 48 | $ 23 |  |

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- Definition Amount excluding accrued interest, of allowance for credit loss on 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 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph c -Publisher SEC + Details
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- Definition Amount, excluding accrued interest, of increase (decrease) in allowance for credit loss on 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 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
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