Statement of Changes in Shareholders' Equity (Unaudited) - USD ($)	Total	General Shares [Member]	Shares [Member]
Balance - Value at Dec. 31, 2018	$ 494,781,661	$ 678	$ 494,780,983
Balance - Shares at Dec. 31, 2018		40	29,200,000
Purchases of Shares - Value	16,951,145		$ 16,951,145
Purchases of Shares - Shares			1,000,000
Redemption of Shares - Value	(43,494,213)		$ (43,494,213)
Redemption of Shares - Shares			(2,600,000)
Net Increase (Decrease) due to Share Transactions, value	(26,543,068)		$ (26,543,068)
Net Increase (Decrease) due to Share Transactions, shares			(1,600,000)
Net Income (Loss)
Net Investment Income (Loss)	1,743,850	$ 2	$ 1,743,848
Net Realized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts	(13,815,711)	(19)	(13,815,692)
Net Change in Unrealized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts	(1,169,806)	(1)	(1,169,805)
Net Income (Loss)	(13,241,667)	(18)	(13,241,649)
Net Change in Shareholders' Equity, value	(39,784,735)	(18)	$ (39,784,717)
Net Change in Shareholders' Equity, shares			(1,600,000)
Balance - Value at Mar. 31, 2019	454,996,926	$ 660	$ 454,996,266
Balance - Shares at Mar. 31, 2019		40	27,600,000
Balance - Value at Dec. 31, 2019	347,795,397	$ 662	$ 347,794,735
Balance - Shares at Dec. 31, 2019		40	21,000,000
Purchases of Shares - Value	34,463,738		$ 34,463,738
Purchases of Shares - Shares			2,200,000
Redemption of Shares - Value	(38,916,870)		$ (38,916,870)
Redemption of Shares - Shares			(2,600,000)
Net Increase (Decrease) due to Share Transactions, value	(4,453,132)		$ (4,453,132)
Net Increase (Decrease) due to Share Transactions, shares			(400,000)
Net Income (Loss)
Net Investment Income (Loss)	564,911	$ 1	$ 564,910
Net Realized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts	(13,362,735)	(25)	(13,362,710)
Net Change in Unrealized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts	(40,002,253)	(74)	(40,002,179)
Net Income (Loss)	(52,800,077)	(98)	(52,799,979)
Net Change in Shareholders' Equity, value	(57,253,209)	(98)	$ (57,253,111)
Net Change in Shareholders' Equity, shares			(400,000)
Balance - Value at Mar. 31, 2020	$ 290,542,188	$ 564	$ 290,541,624
Balance - Shares at Mar. 31, 2020		40	20,600,000