Capital (Regulatory Capital Requirements) (Details) $ in Millions |
Jun. 30, 2026
USD ($)
|
Dec. 31, 2025
USD ($)
|
|---|---|---|
| Banking Regulation, Total Capital [Abstract] | ||
| Number of Finance Agency Regulatory Capital Requirements | 3 | |
| Federal Home Loan Bank, Risk-Based Capital, Required | $ 2,057 | $ 1,878 |
| Federal Home Loan Bank, Risk-Based Capital, Actual | 11,255 | 10,336 |
| Federal Home Loan Bank, Regulatory Capital, Required | 8,505 | 7,460 |
| Federal Home Loan Bank, Regulatory Capital, Actual | 11,255 | 10,336 |
| Federal Home Loan Bank, Leverage Capital, Required | 10,631 | 9,325 |
| Federal Home Loan Bank, Leverage Capital, Actual | $ 16,882 | $ 15,504 |
| Regulatory Capital Ratio, Required | 4.00% | 4.00% |
| Federal Home Loan Bank, Regulatory Capital Ratio, Actual | 5.29% | 5.54% |
| Federal Home Loan Bank, Capital Stock to Assets, Required | 2.00% | 2.00% |
| Federal Home Loan Bank, Capital Stock to Assets, Actual | 3.61% | 3.38% |
| Leverage Ratio, Required | 5.00% | 5.00% |
| Federal Home Loan Bank, Leverage Ratio, Actual | 7.94% | 8.31% |