Consolidated Obligations (Bonds) (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Total Par Value	$ 89,188	$ 88,588
Total	89,249	88,571
Consolidated Obligation Bonds [Member]
Debt Instrument [Line Items]
Total Par Value	89,188	88,588
Due in one year or less	$ 38,808	$ 43,287
Due in one year or less, Weighted Average Interest Rate	3.76%	4.53%
Due after one year through two years	$ 32,347	$ 28,333
Due after one year through two years, Weighted Average Interest Rate	3.84%	4.45%
Due after two years through three years	$ 3,577	$ 2,712
Due after two years through three years, Weighted Average Interest Rate	4.11%	3.85%
Due after three years through four years	$ 3,351	$ 2,957
Due after three years through four years, Weighted Average Interest Rate	3.71%	4.19%
Due after four years through five years	$ 2,399	$ 4,021
Due after four years through five years, Weighted Average Interest Rate	3.44%	4.01%
Thereafter	$ 8,706	$ 7,278
Thereafter, Weighted Average Interest Rate	4.52%	4.11%
Total par value, Weighted Average Interest Rate	3.87%	4.41%
Premiums	$ 28	$ 30
Discounts and Concessions	(23)	(25)
Fair value hedging adjustments	56	(22)
Earlier of Contractual Maturity or Next Call Date [Member] | Consolidated Obligation Bonds [Member]
Debt Instrument [Line Items]
Due in one year or less	79,984	69,363
Due after one year through two years	3,609	12,793
Due after two years through three years	2,901	2,531
Due after three years through four years	1,594	1,952
Due after four years through five years	685	1,399
Thereafter	$ 415	$ 550