Capital and Mandatorily Redeemable Capital Stock (MRCS) (Regulatory Capital Requirements) (Details) - USD ($) $ in Millions |
Jun. 30, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Federal Home Loan Banks [Abstract] | ||
| Total Regulatory Capital, Requirement | $ 5,813 | $ 5,164 |
| Total Regulatory Capital, Actual | $ 9,165 | $ 8,582 |
| Total Regulatory Capital Ratio, Requirement | 4.00% | 4.00% |
| Total Regulatory Capital Ratio, Actual | 6.31% | 6.65% |
| Leverage Capital, Requirement | $ 7,266 | $ 6,456 |
| Leverage Capital, Actual | $ 13,747 | $ 12,873 |
| Leverage Capital Ratio, Requirement | 5.00% | 5.00% |
| Leverage Capital Ratio, Actual | 9.46% | 9.97% |
| Risk Based Capital, Requirement | $ 1,980 | $ 1,845 |
| Risk Based Capital, Actual | $ 9,165 | $ 8,582 |