Document and Entity Information	3 Months Ended
	Mar. 31, 2022 shares
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2022
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q1
Trading Symbol	UDN
Entity Registrant Name	INVESCO DB US DOLLAR INDEX BEARISH FUND
Entity Central Index Key	0001383149
Current Fiscal Year End Date	--12-31
Entity File Number	001-33318
Entity Tax Identification Number	87-0778084
Entity Address, Address Line One	c/o Invesco Capital Management LLC
Entity Address, Address Line Two	3500 Lacey Road
Entity Address, Address Line Three	Suite 700
Entity Address, City or Town	Downers Grove
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60515
City Area Code	800
Local Phone Number	983-0903
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding	2,300,000
Document Quarterly Report	true
Document Transition Report	false
Title of 12(b) Security	Common Units of Beneficial Interest
Security Exchange Name	NYSEArca
Entity Incorporation, State or Country Code	DE