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Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Commitments to Extend Credit |  |
Letters of credit | $ 3,000 | $ 2,900
Allowance for unfunded credit commitments | 49 | 39
Standby Letters of Credit |  |
Commitments to Extend Credit |  |
Letters of credit | 2,900 | 2,900
Commercial Letters of Credit |  |
Commitments to Extend Credit |  |
Letters of credit | $ 31 | $ 29

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- Definition Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482454/460-10-45-1 + Details
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