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v3.25.3

Share Purchases and Redemptions - Additional Information (Detail) | 9 Months Ended
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Sep. 30, 2025 CreationUnit shares
Equity [Abstract] |
Minimum number of Creation Units that can be purchased | CreationUnit | 1
Number of shares issued per Creation Unit | shares | 50,000
Minimum number of Creation Units that can be redeemed | CreationUnit | 1
Number of shares that can be redeemed per creation unit | shares | 50,000

X
- Definition Minimum number of creation units of shares that can be purchased. + References No definition available. + Details
Name: | udn_MinimumNumberOfCreationUnitsOfSharesThatCanBePurchased
Namespace Prefix: | udn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum number of creation units of shares that can be redeemed. + References No definition available. + Details
Name: | udn_MinimumNumberOfCreationUnitsOfSharesThatCanBeRedeemed
Namespace Prefix: | udn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares issued per creation unit. + References No definition available. + Details
Name: | udn_NumberOfSharesIssuedPerCreationUnit
Namespace Prefix: | udn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares redeemable per creation unit. + References No definition available. + Details
Name: | udn_NumberOfSharesRedeemablePerCreationUnit
Namespace Prefix: | udn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_EquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration