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v2.4.1.9

Condensed Statement of Changes in Partners' Capital (USD $) | Total | General Partner [Member] | Limited Partners [Member]
--- | --- | --- | ---
Beginning Balance at Dec. 31, 2014 | $ 1,277,679,873 us-gaap_PartnersCapital | $ 0 us-gaap_PartnersCapital / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember | $ 1,277,679,873 us-gaap_PartnersCapital / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember
Net asset value, beginning of year at Dec. 31, 2014 | $ 20.15 uso_NetAssetValuePerUnit |  |
Addition of partnership shares | 3,113,839,910 us-gaap_PartnersCapitalAccountContributions | 0 us-gaap_PartnersCapitalAccountContributions / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember | 3,113,839,910 us-gaap_PartnersCapitalAccountContributions / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember
Redemption of partnership shares | (1,322,555,352)us-gaap_PartnersCapitalAccountRedemptions | 0 us-gaap_PartnersCapitalAccountRedemptions / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember | (1,322,555,352)us-gaap_PartnersCapitalAccountRedemptions / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember
Net income | (276,690,243)us-gaap_NetIncomeLoss | 0 us-gaap_NetIncomeLoss / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember | (276,690,243)us-gaap_NetIncomeLoss / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember
Ending Balance at Mar. 31, 2015 | $ 2,792,274,188 us-gaap_PartnersCapital | $ 0 us-gaap_PartnersCapital / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember | $ 2,792,274,188 us-gaap_PartnersCapital / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember
Net asset value, end of year at Mar. 31, 2015 | $ 16.87 uso_NetAssetValuePerUnit |  |

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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.18) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.22) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 + Details
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- Definition The amount of ownership interest of different classes of partners in limited partnership. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055 + Details
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- Definition Total contributions made by each class of partners (i.e., general, limited and preferred partners). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770 + Details
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- Definition Total change in each class of partners' capital accounts during the year due to redemptions and adjustments to redemption value. All partners include general, limited and preferred partners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770 + Details
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