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Condensed Schedule of Investments (Unaudited)
Jun. 30, 2020
USD ($)
contract
Cash Equivalents [Member]  
Market Value $ 369,208,444
% of Partners' Capital 89.29%
United States Treasury Obligations [Member] | Cash Equivalents [Member]  
Market Value $ 22,973,730
% of Partners' Capital 5.56%
United States - Money Market Funds [Member] | United States [Member] | Cash Equivalents [Member]  
Market Value $ 346,234,714
% of Partners' Capital 83.73%
Fidelity Investments Money Market Funds - Government Portfolio [Member] | United States - Money Market Funds [Member] | United States [Member] | Cash Equivalents [Member]  
Principal Amount $ 166,102 [1]
Market Value $ 166,101 [1]
% of Partners' Capital 0.04% [1]
Goldman Sachs Financial Square Funds - Government Fund - Class FS [Member] | United States - Money Market Funds [Member] | United States [Member] | Cash Equivalents [Member]  
Principal Amount $ 345,657,925 [1]
Market Value $ 345,657,925 [1]
% of Partners' Capital 83.59% [1]
RBC U.S. Government Money Market Fund - Institutional Share Class [Member] | United States - Money Market Funds [Member] | United States [Member] | Cash Equivalents [Member]  
Principal Amount $ 410,688 [1]
Market Value $ 410,688 [1]
% of Partners' Capital 0.10% [1]
ICE Brent Crude Oil Futures CO September 2020 contracts, expiring July 2020 [Member] | United Kingdom Contracts [Member] | Open Commodity Futures Contracts - Long [Member]  
Principal Amount $ 414,606,830 [2]
Number of Contracts | contract 10,020 [2]
Fair Value/Unrealized Gain (Loss) on Open Commodity Contracts $ (1,081,430) [2]
% of Partners' Capital (0.26%) [2]
U.S. Treasury Bills, 1.54%, 7/02/2020 | United States Treasury Obligations [Member] | Cash Equivalents [Member]  
Principal Amount $ 2,000,000
Market Value $ 1,999,915
% of Partners' Capital 0.49%
U.S. Treasury Bills, 1.52%, 7/09/2020 | United States Treasury Obligations [Member] | Cash Equivalents [Member]  
Principal Amount $ 2,000,000
Market Value $ 1,999,332
% of Partners' Capital 0.49%
U.S. Treasury Bills, 1.55%, 7/16/2020 | United States Treasury Obligations [Member] | Cash Equivalents [Member]  
Principal Amount $ 2,000,000
Market Value $ 1,998,725
% of Partners' Capital 0.49%
U.S. Treasury Bills, 1.53%, 7/23/2020 | United States Treasury Obligations [Member] | Cash Equivalents [Member]  
Principal Amount $ 2,000,000
Market Value $ 1,998,148
% of Partners' Capital 0.48%
U.S. Treasury Bills, 1.54%, 7/30/2020 | United States Treasury Obligations [Member] | Cash Equivalents [Member]  
Principal Amount $ 2,000,000
Market Value $ 1,997,551
% of Partners' Capital 0.48%
U.S. Treasury Bills, 1.54%, 8/06/2020 | United States Treasury Obligations [Member] | Cash Equivalents [Member]  
Principal Amount $ 2,000,000
Market Value $ 1,996,960
% of Partners' Capital 0.48%
U.S. Treasury Bills, 1.52%, 8/13/2020 | United States Treasury Obligations [Member] | Cash Equivalents [Member]  
Principal Amount $ 2,000,000
Market Value $ 1,996,400
% of Partners' Capital 0.48%
U.S. Treasury Bills, 1.53%, 8/20/2020 | United States Treasury Obligations [Member] | Cash Equivalents [Member]  
Principal Amount $ 2,000,000
Market Value $ 1,995,806
% of Partners' Capital 0.48%
U.S. Treasury Bills,1.43%, 8/27/2020 | United States Treasury Obligations [Member] | Cash Equivalents [Member]  
Principal Amount $ 2,000,000
Market Value $ 1,995,535
% of Partners' Capital 0.48%
U.S. Treasury Bills, 0.68%, 9/03/2020 | United States Treasury Obligations [Member] | Cash Equivalents [Member]  
Principal Amount $ 2,000,000
Market Value $ 1,997,618
% of Partners' Capital 0.48%
U.S. Treasury Bills, 0.39%, 9/10/2020 | United States Treasury Obligations [Member] | Cash Equivalents [Member]  
Principal Amount $ 3,000,000
Market Value $ 2,997,740
% of Partners' Capital 0.73%
[1] Reflects the 7-day yield at June 30, 2020
[2] Collateral amounted to $68,025,972 on open commodity futures contracts.