| Cover Page | Oct. 20, 2020 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Entity Central Index Key | 0001371571 |
| Document Period End Date | Oct. 20, 2020 |
| Entity Registrant Name | Invesco DB US Dollar Index Trust |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-33317 |
| 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 Grov |
| Entity Address, State or Province | IL |
| Entity Address, Postal Zip Code | 60515 |
| City Area Code | 800 |
| Local Phone Number | 983-0903 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| INVESCO DB US DOLLAR INDEX BEARISH FUND [Member] | |
| Document Information [Line Items] | |
| Entity Central Index Key | 0001383149 |
| Entity Registrant Name | INVESCO DB US DOLLAR INDEX BEARISH FUND |
| Entity File Number | 001-33318 |
| Entity Tax Identification Number | 87-0778084 |
| Title of 12(b) Security | Common Units of Beneficial Interest |
| Trading Symbol | UDN |
| Security Exchange Name | NYSEArca |
| INVESCO DB US DOLLAR INDEX BULLISH FUND [Member] | |
| Document Information [Line Items] | |
| Entity Registrant Name | INVESCO DB US DOLLAR INDEX BULLISH FUND |
| Entity File Number | 001-33314 |
| Entity Tax Identification Number | 87-0778082 |
| Title of 12(b) Security | Common Units of Beneficial Interest |
| Trading Symbol | UUP |
| Security Exchange Name | NYSEArca |
