Advances (Redemption Terms) (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Advances [Abstract]
Overdrawn Demand Deposit Accounts	$ 0	$ 1
Advances, Maturing in Next Rolling Twelve Months	53,895	45,738
Advances, Maturing in Rolling Year Two	14,770	16,105
Advances, Maturing in Rolling Year Three	15,574	12,751
Advances, Maturing in Rolling Year Four	11,013	13,328
Advances, Maturing in Rolling Year Five	9,511	7,787
Advances, Maturing after Rolling Year Five	5,415	5,020
Advances, Par Value	$ 110,178	$ 100,730
Advances, Weighted Average Interest Rate on Overdrawn Demand Deposit	0.00%	6.12%
Advances, Weighted Average Interest Rate, Maturing in Next Twelve Rolling Months	3.87%	4.44%
Advances, Weighted Average Interest Rate, Maturing in Rolling Year Two	3.84%	3.84%
Advances, Weighted Average Interest Rate, Maturing in Rolling Year Three	4.12%	4.19%
Advances, Weighted Average Interest Rate, Maturing in Rolling Year Four	3.93%	4.30%
Advances, Weighted Average Interest Rate, Maturing in Rolling Year Five	4.12%	4.33%
Advances, Weighted Average Interest Rate, Maturing after Rolling Year Five	4.27%	4.25%
Advances, Weighted Average Interest Rate	3.95%	4.27%
Premiums	$ 2	$ 3
Discounts	(22)	(21)
Federal Home Loan Bank, Advances, Valuation Adjustments for Hedging Activities	72	(761)
Total Advances	110,230	99,951
Advances, Earlier of Contractual Maturity or Next Call Date, in Next Rolling Twelve Months	63,698	54,893
Advances, Earlier of Contractual Maturity or Next Call Date, in Rolling Year Two	13,315	14,474
Advances, Earlier of Contractual Maturity or Next Call Date, in Rolling Year Three	13,455	10,312
Advances, Earlier of Contractual Maturity or Next Call Date, in Rolling Year Four	7,976	11,080
Advances, Earlier of Contractual Maturity or Next Call Date, in Rolling Year Five	6,361	4,990
Advances, Earlier of Contractual Maturity or Next Call Date, after Rolling Year Five	$ 5,373	$ 4,980