Commitments and Contingencies Off-Balance Sheet Commitments (Details) - USD ($) $ in Millions |
Sep. 30, 2026 |
Dec. 31, 2025 |
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| Standby letters of credit outstanding | Carrying Value(1) | ||
| Loss Contingencies [Line Items] | ||
| Other commitments | $ 65 | $ 63 |
| Standby letters of credit outstanding | ||
| Loss Contingencies [Line Items] | ||
| Off balance sheet commitments | 20,201 | 20,275 |
| Discount notes | ||
| Loss Contingencies [Line Items] | ||
| Off balance sheet commitments | 0 | 168 |
| Commitments to issue consolidated obligation bonds, par | ||
| Loss Contingencies [Line Items] | ||
| Off balance sheet commitments | 25 | 0 |
| Commitments to fund additional advances | ||
| Loss Contingencies [Line Items] | ||
| Off balance sheet commitments | $ 112 | $ 0 |
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- Definition Fair value portion of arrangements with third parties, including, but not limited to, operating lease arrangement and arrangement in which the entity has agreed to expend funds to procure goods or services, or has agreed to commit resources to supply goods or services. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition The face amount of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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/2009/role/commonPracticeRef
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