Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions |
Mar. 31, 2026 |
Dec. 31, 2025 |
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| Commitments to Extend Credit | ||
| Letters of credit | $ 3,000 | $ 3,000 |
| Allowance for unfunded credit commitments | 47 | 49 |
| Standby Letters of Credit | ||
| Commitments to Extend Credit | ||
| Letters of credit | 3,000 | 2,900 |
| Commercial Letters of Credit | ||
| Commitments to Extend Credit | ||
| Letters of credit | $ 39 | $ 31 |
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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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. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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