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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Additional Information) (Detail) | Mar. 31, 2018 $ / Unit shares
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Significant Accounting Policies [Line Items] |
Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets | $ / Unit | 1,000
Creations and Redemptions Basket [Member] |
Significant Accounting Policies [Line Items] |
Number of units per basket | shares | 100,000

X
- Definition Fee Paid Per Order + References No definition available. + Details
Name: | uso_FeePaidPerOrder
Namespace Prefix: | uso_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of units per basket. + References No definition available. + Details
Name: | uso_NumberOfUnitPerBasket
Namespace Prefix: | uso_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Significant Accounting Policies [Line Items] + References No definition available. + Details
Name: | uso_SignificantAccountingPoliciesLineItems
Namespace Prefix: | uso_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | invest_InvestmentSecuritiesClassAxis=uso_RedemptionBasketsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |