Derivatives and Hedging Activities (Net Gains (Losses) on Fair Value Hedging Relationships) (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||||||
| Interest Income, Advances | $ 1,084 | $ 1,193 | $ 2,117 | $ 2,301 | ||||
| Available-for-sale securities | 128 | 83 | 227 | 143 | ||||
| Interest Expense, Consolidated obligation Bonds | (1,041) | (1,397) | (2,016) | (2,654) | ||||
| Interest Expense, Consolidated Obligation Discount notes | (409) | (189) | (816) | (417) | ||||
| Advances [Member] | ||||||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||||||
| Derivatives | [1] | 112 | (35) | 208 | (206) | |||
| Hedged Items | [2] | (94) | 99 | (170) | 326 | |||
| Gain (Loss) on Fair Value Hedges Recognized in Earnings | 18 | 64 | 38 | 120 | ||||
| Available-for-sale Securities [Member] | ||||||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||||||
| Derivatives | [1] | 89 | (39) | 158 | (88) | |||
| Hedged Items | [2] | (97) | 47 | (170) | 100 | |||
| Gain (Loss) on Fair Value Hedges Recognized in Earnings | (8) | 8 | (12) | 12 | ||||
| Bonds | ||||||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||||||
| Derivatives | [1] | (28) | 4 | (86) | 57 | |||
| Hedged Items | [2] | (17) | (124) | (23) | (304) | |||
| Gain (Loss) on Fair Value Hedges Recognized in Earnings | (45) | (120) | (109) | (247) | ||||
| Discount Notes | ||||||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||||||
| Derivatives | [1] | (4) | (1) | (12) | (1) | |||
| Hedged Items | [2] | 5 | 0 | 19 | 6 | |||
| Gain (Loss) on Fair Value Hedges Recognized in Earnings | $ 1 | $ (1) | $ 7 | $ 5 | ||||
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- Definition Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement. 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/exampleRef
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- Definition Total amount of gain (loss) derived from fair value hedges recognized in earnings in the period. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of interest expense incurred on long-term debt classified as other, including, but not limited to, interest on long-term notes and amortization of issuance costs. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Interest expense incurred during the reporting period on other short-term borrowings. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of interest income, amortization of premium and accretion of discount on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale); classified as operating. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of interest income from Federal Home Loan Bank (FHLBank) advances to member financial institutions. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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