Fair Value (Fair Value Option) (Details) - USD ($) $ in Millions |
3 Months Ended | |||
|---|---|---|---|---|
Mar. 31, 2025 |
Mar. 31, 2024 |
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| Fair Value, Option, Quantitative Disclosures [Line Items] | ||||
| Balance, beginning of the period | [1] | $ 5,286 | ||
| Net gain/(loss) on advances and consolidated obligation bonds held under fair value option | 29 | $ (14) | ||
| Balance, end of the period | [1] | 5,539 | ||
| Advances | ||||
| Fair Value, Option, Quantitative Disclosures [Line Items] | ||||
| Net gain/(loss) on advances and consolidated obligation bonds held under fair value option | 33 | (13) | ||
| Consolidated obligation bonds | ||||
| Fair Value, Option, Quantitative Disclosures [Line Items] | ||||
| Net gain/(loss) on advances and consolidated obligation bonds held under fair value option | $ (4) | $ (1) | ||
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