Capital Narrative (Details) - USD ($) $ in Millions |
6 Months Ended | |
|---|---|---|
Jun. 30, 2026 |
Dec. 31, 2025 |
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| Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] | ||
| Written Notice Period Required to Repurchase Excess Membership Capital Stock | 15 days | |
| Banking Regulation, Total Risk-Based Capital, Excess, Actual | $ 0 | $ 0 |
| Retained Earnings, Appropriated | $ 1,352 | $ 1,254 |
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- Definition Written Notice Period Required to Repurchase Excess Membership Capital Stock No definition available.
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| X | ||||||||||
- 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/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount of total risk-based capital exceeding minimum required for capital adequacy as defined by regulatory framework. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of accumulated undistributed earnings (deficit) not available for dividend distribution. Includes, but is not limited to, retained earnings appropriated for specific business purpose. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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