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Schedule of Investments
 12 Months Ended
Dec. 31, 2023
USD ($)
contract
Dec. 31, 2022
USD ($)
contract
Notional Amount [1] $ 223,865,330  
Number of Contracts | contract 29,248  
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 40,072,461 $ (144,765,937)
Fair Value/Open Commodity Swap Contracts [1] 238,768,541  
Unrealized Gain (Loss) on Commodity Swap Contracts [1],[2] 14,903,211  
MACQUARIE MQCP362H 12122023 Index | Macquarie Bank Ltd.    
Notional Amount [3] $ 129,306,126  
Number of Contracts [3] 0.25  
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts [3] $ 144,210,360  
Payment frequency [3] Monthly  
Expiration Date [3] Jan. 12, 2024  
Unrealized Gain (Loss) on Commodity Swap Contracts [2],[3] $ 14,904,234  
SOC GEN SGIXCNG1 09292023 Index | Societe Generale    
Notional Amount [3] $ 94,559,204  
Number of Contracts [3] 0.40  
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts [3] $ 94,558,181  
Payment frequency [3] Monthly  
Expiration Date [3] Mar. 29, 2024  
Unrealized Gain (Loss) on Commodity Swap Contracts [2],[3] $ (1,023)  
Open Commodity Futures Contracts - Long | NYMEX Natural Gas Futures NG February 2024 contracts, expiring January 2024    
Notional Amount $ 695,222,259  
Number of Contracts 29,248  
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 40,072,461  
% of Partners' Capital 4.11%  
Open Commodity Futures Contracts - Long | United States | NYMEX Natural Gas Futures NG February 2023 contracts, expiring January 2023    
Notional Amount [4]   $ 574,231,687
Number of Contracts | contract [4]   9,597
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts [4]   $ (144,765,937)
% of Partners' Capital [4]   (33.72%)
Cash Equivalents | United States | Money Market Funds    
Market Value $ 70,950,000 $ 317,800,000
% of Partners' Capital 7.29% 74.02%
Cash Equivalents | United States | Money Market Funds | Morgan Stanley Institutional Liquidity Funds - Government Portfolio - Institutional Shares, 5.27%    
Shares/Principal Amount $ 70,950,000  
Market Value $ 70,950,000  
% of Partners' Capital 7.29%  
Cash Equivalents | United States | Money Market Funds | Morgan Stanley Institutional Liquidity Funds - Government Portfolio - Institutional Shares    
Shares/Principal Amount [5]   $ 317,800,000
Market Value [5]   $ 317,800,000
% of Partners' Capital [5]   74.02%
[1] Collateral amounted to $40,660,000 on open OTC commodity swap contracts.
[2] Reflects the value at reset date of December 29, 2023.
[3] Custom index comprised of a basket of underlying instruments.
[4] Collateral amounted to $241,622,902 on open commodity futures contracts.
[5] Reflects the 7-day yield at December 31, 2022.