Advances (Redemption Terms) (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Advances [Abstract]
Due in one year or less	$ 67,379	$ 53,895
Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Maturing in Next Twelve Rolling Months	3.79%	3.87%
Due after one year through two years	$ 15,695	$ 14,770
Federal Home Loan Bank Advances, Weighted Average Interest Rate, Maturing in Rolling Year Two	3.87%	3.84%
Due after two years through three years	$ 14,647	$ 15,574
Federal Home Loan Bank Advances, Weighted Average Interest Rate, Maturing in Rolling Year Three	4.06%	4.12%
Due after three years through four years	$ 11,839	$ 11,013
Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Maturing in Rolling Year Four	3.93%	3.93%
Due after four years through five years	$ 9,348	$ 9,511
Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Maturing in Rolling Year Five	3.96%	4.12%
Thereafter	$ 8,315	$ 5,415
Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Maturing after Rolling Year Five	4.27%	4.27%
Federal Home Loan Bank, Advances, Par Value	$ 127,223	$ 110,178
Federal Home Loan Bank, Advances, Weighted Average Interest Rate	3.89%	3.95%
Premiums	$ 2	$ 2
Discounts	(28)	(22)
Fair value hedging adjustments	(165)	72
Total	127,032	110,230
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Call Date, in Next Rolling Twelve Months	77,434	63,698
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Call Date, in Rolling Year Two	14,433	13,315
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Call Date, in Rolling Year Three	12,470	13,455
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Call Date, in Rolling Year Four	8,102	7,976
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Call Date, in Rolling Year Five	6,510	6,361
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Call Date, after Rolling Year Five	$ 8,274	$ 5,373