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v2.4.1.9

Condensed Schedule of Investments (Parenthetical) (USD $) | 3 Months Ended
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Mar. 31, 2015
Collateral Amount On Open Futures Contracts | 369,394,262 uso_CollateralAmountOnOpenFuturesContracts
United States [Member] | US Treasury Bill Securities One [Member] | US Treasury Securities [Member] | Cash Equivalent [Member] |
Interest rate | 0.05%us-gaap_DebtInstrumentInterestRateStatedPercentage / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = uso_UsTreasuryBillSecuritiesOneMember / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember
Expiration date | 4/23/2015
United States [Member] | US Treasury Bill Securities Two [Member] | US Treasury Securities [Member] | Cash Equivalent [Member] |
Interest rate | 0.07%us-gaap_DebtInstrumentInterestRateStatedPercentage / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = uso_UsTreasuryBillSecuritiesTwoMember / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember
Expiration date | 5/21/2015
United States [Member] | US Treasury Bill Securities Three [Member] | US Treasury Securities [Member] | Cash Equivalent [Member] |
Interest rate | 0.02%us-gaap_DebtInstrumentInterestRateStatedPercentage / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = uso_UsTreasuryBillSecuritiesThreeMember / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember
Expiration date | 5/28/2015
United States [Member] | US Treasury Bill Securities Four [Member] | US Treasury Securities [Member] | Cash Equivalent [Member] |
Interest rate | 0.05%us-gaap_DebtInstrumentInterestRateStatedPercentage / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = uso_UsTreasuryBillSecuritiesFourMember / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember
Expiration date | 6/4/2015
United States [Member] | US Treasury Bill Securities Five [Member] | US Treasury Securities [Member] | Cash Equivalent [Member] |
Interest rate | 0.03%us-gaap_DebtInstrumentInterestRateStatedPercentage / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = uso_UsTreasuryBillSecuritiesFiveMember / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember
Expiration date | 6/11/2015
United States [Member] | US Treasury Bill Securities Six [Member] | US Treasury Securities [Member] | Cash Equivalent [Member] |
Interest rate | 0.03%us-gaap_DebtInstrumentInterestRateStatedPercentage / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = uso_UsTreasuryBillSecuritiesSixMember / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember
Expiration date | 6/18/2015
United States [Member] | US Treasury Bill Securities Seven [Member] | US Treasury Securities [Member] | Cash Equivalent [Member] |
Interest rate | 0.10%us-gaap_DebtInstrumentInterestRateStatedPercentage / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = uso_UsTreasuryBillSecuritiesSevenMember / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember
Expiration date | 6/25/2015
United States [Member] | US Treasury Bill Securities Eight [Member] | US Treasury Securities [Member] | Cash Equivalent [Member] |
Interest rate | 0.03%us-gaap_DebtInstrumentInterestRateStatedPercentage / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = uso_UsTreasuryBillSecuritiesEightMember / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember
Expiration date | 7/2/2015
United States [Member] | Us Treasury Bill Securities Nine [Member] | US Treasury Securities [Member] | Cash Equivalent [Member] |
Interest rate | 0.06%us-gaap_DebtInstrumentInterestRateStatedPercentage / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = uso_UsTreasuryBillSecuritiesNineMember / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember
Expiration date | 7/9/2015
United States [Member] | Us Treasury Bill Securities Ten [Member] | US Treasury Securities [Member] | Cash Equivalent [Member] |
Interest rate | 0.05%us-gaap_DebtInstrumentInterestRateStatedPercentage / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = uso_UsTreasuryBillSecuritiesTenMember / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember
Expiration date | 7/16/2015
United States [Member] | Us Treasury Bill Securities Eleven [Member] | US Treasury Securities [Member] | Cash Equivalent [Member] |
Interest rate | 0.08%us-gaap_DebtInstrumentInterestRateStatedPercentage / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = uso_UsTreasuryBillSecuritiesElevenMember / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember
Expiration date | 7/23/2015
United States [Member] | Us Treasury Bill Securities Twelve [Member] | US Treasury Securities [Member] | Cash Equivalent [Member] |
Interest rate | 0.06%us-gaap_DebtInstrumentInterestRateStatedPercentage / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = uso_UsTreasuryBillSecuritiesTwelveMember / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember
Expiration date | 7/30/2015
United States [Member] | Us Treasury Bill Securities Thirteen [Member] | US Treasury Securities [Member] | Cash Equivalent [Member] |
Interest rate | 0.06%us-gaap_DebtInstrumentInterestRateStatedPercentage / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = uso_UsTreasuryBillSecuritiesThirteenMember / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember
Expiration date | 8/6/2015
United States [Member] | Us Treasury Bill Securities Fourteen [Member] | US Treasury Securities [Member] | Cash Equivalent [Member] |
Interest rate | 0.07%us-gaap_DebtInstrumentInterestRateStatedPercentage / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = uso_UsTreasuryBillSecuritiesFourteenMember / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember
Expiration date | 8/13/2015
United States [Member] | Us Treasury Bill Securities Fifteen [Member] | US Treasury Securities [Member] | Cash Equivalent [Member] |
Interest rate | 0.07%us-gaap_DebtInstrumentInterestRateStatedPercentage / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = uso_UsTreasuryBillSecuritiesFifteenMember / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember
Expiration date | 8/20/2015
United States [Member] | Us Treasury Bill Securities Sixteen [Member] | US Treasury Securities [Member] | Cash Equivalent [Member] |
Interest rate | 0.07%us-gaap_DebtInstrumentInterestRateStatedPercentage / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = uso_UsTreasuryBillSecuritiesSixteenMember / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember
Expiration date | 8/27/2015
United States [Member] | Us Treasury Bill Securities Seventeen [Member] | US Treasury Securities [Member] | Cash Equivalent [Member] |
Interest rate | 0.08%us-gaap_DebtInstrumentInterestRateStatedPercentage / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = uso_UsTreasuryBillSecuritiesSeventeenMember / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember
Expiration date | 9/3/2015
United States [Member] | Us Treasury Bill Securities Eighteen [Member] | US Treasury Securities [Member] | Cash Equivalent [Member] |
Interest rate | 0.10%us-gaap_DebtInstrumentInterestRateStatedPercentage / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = uso_UsTreasuryBillSecuritiesEighteenMember / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember
Expiration date | 9/10/2015
United States [Member] | Us Treasury Bill Securities Nineteen [Member] | US Treasury Securities [Member] | Cash Equivalent [Member] |
Interest rate | 0.12%us-gaap_DebtInstrumentInterestRateStatedPercentage / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = uso_UsTreasuryBillSecuritiesNineteenMember / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember
Expiration date | 9/17/2015
United States [Member] | Us Treasury Bill Securities Twenty [Member] | US Treasury Securities [Member] | Cash Equivalent [Member] |
Interest rate | 0.11%us-gaap_DebtInstrumentInterestRateStatedPercentage / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = uso_UsTreasuryBillSecuritiesTwentyMember / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember
Expiration date | 9/24/2015

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