Capital (Regulatory Capital Requirements) (Details) $ in Millions	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Banking Regulation, Total Capital [Abstract]
Number of Finance Agency Regulatory Capital Requirements	3
Multiplier for Determining Permanent Capital in Leverage Capital Calculation	1.5
Multiplier for Determining Nonpermanent Capital in Leverage Capital Calculation	1.0
Risk-Based Capital, Required	$ 1,878	$ 1,499
Risk-Based Capital, Actual	$ 10,336	$ 9,489
Regulatory Capital Ratio, Required	4.00%	4.00%
Regulatory Capital Ratio, Actual	5.54%	5.74%
Federal Home Loan Bank, Capital Stock to Assets, Required	2.00%	2.00%
Federal Home Loan Bank, Capital Stock to Assets, Actual [Line Items]	3.38%	3.53%
Regulatory Capital, Required	$ 7,460	$ 6,610
Regulatory Capital, Actual	$ 10,336	$ 9,489
Leverage Ratio, Required	5.00%	5.00%
Federal Home Loan Bank, Leverage Ratio, Actual	8.31%	8.61%
Leverage Capital, Required	$ 9,325	$ 8,263
Leverage Capital, Actual	$ 15,504	$ 14,233