Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2025	Feb. 28, 2026	Jun. 30, 2025
Document and Entity Information [Abstract]
Entity Tax Identification Number	42-6000149
Document Type	10-K
Document Period End Date	Dec. 31, 2025
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	FY
Document Annual Report	true
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Amendment Flag	false
Entity Registrant Name	FEDERAL HOME LOAN BANK OF DES MOINES
Entity Central Index Key	0001325814
Entity File Number	000-51999
Entity Filer Category	Non-accelerated Filer
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Public Float			$ 0
Entity Common Stock, Shares Outstanding		73,091,289
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Shell Company	false
City Area Code	515
Local Phone Number	412-2100
Entity Address, Address Line One	909 Locust Street
Entity Address, State or Province	IA
Entity Address, Postal Zip Code	50309
Entity Address, Address Line Two	Des Moines
Entity Incorporation, State or Country Code	X1
Document Financial Statement Error Correction [Flag]	false
No Insider Trading Flag	true
ICFR Auditor Attestation Flag	true
Auditor Name	PricewaterhouseCoopers LLP
Auditor Location	Chicago, Illinois
Auditor Firm ID	238
Common Stock, Value, Outstanding			$ 6,694,016,600