Consolidated Obligations (Narrative) (Details) - USD ($) $ in Billions	Dec. 31, 2025	Dec. 31, 2024
Schedule of Short-term and Long-term Debt [Line Items]
Obligation with Joint and Several Liability Arrangement, Amount Outstanding	$ 977.4	$ 1,039.2
FHLBanks [Member]
Schedule of Short-term and Long-term Debt [Line Items]
Obligation with Joint and Several Liability Arrangement, Amount Outstanding	$ 1,151.8	$ 1,193.0

Amount outstanding, before the effects of recovery, of obligation under the joint and several liability arrangement.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 405
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477092/405-40-50-1

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant