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Allowance for Credit Losses on Loans and Leases - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
Financing Receivable, Allowance for Credit Losses |  |  |  |  |  |  |
Allowance for credit losses on loans and leases | $ 1,268 | $ 1,268 | $ 1,215 | $ 992 | $ 594 | $ 550 | $ 393
Increase in allowance for credit losses | $ (276) |  |  |  |  |  |
Allowance for credit loss, reprice period |  | 18 months |  |  |  |  |
Allowance for credit loss to loans held for investment ratio | 1.70% | 1.70% |  | 1.17% |  |  |
Excluding loans with government guarantees and warehouse loans, the allowance for credit losses | 1.72% | 1.72% |  | 1.26% |  |  |
Total loan commitments |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |  |  |  |
Allowance for credit losses on loans and leases | $ 58 | $ 58 |  | $ 52 |  |  |

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- Definition Financing Receivable, Unguaranteed, Allowance For Credit Loss To Outstanding, Percent + References No definition available. + Details
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- Definition Percentage of allowance for credit loss to total financing receivable outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph a -Subparagraph (1) -Publisher SEC + Details
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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/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph c -Publisher SEC Reference 2: 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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- 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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