Statement of Changes in Shareholders' Equity (Unaudited) - USD ($)	Total	Shares [Member]	General Shares [Member]
Balance - Value at Dec. 31, 2019	$ 1,428,657,083	$ 1,428,656,445	$ 638
Balance - Shares at Dec. 31, 2019		89,600,000	40
Purchases of Shares - Value	255,230,466	$ 255,230,466
Purchases of Shares - Shares		19,400,000
Redemption of Shares - Value	(375,246,076)	$ (375,246,076)
Redemption of Shares - Shares		(28,600,000)
Net Increase (Decrease) due to Share Transactions, value	(120,015,610)	$ (120,015,610)
Net Increase (Decrease) due to Share Transactions, shares		(9,200,000)
Net Income (Loss)
Net Investment Income (Loss)	(58,810)	$ (58,810)	$ 0
Net Realized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts	(209,222,504)	(209,222,411)	(93)
Net Change in Unrealized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts	(47,252,900)	(47,252,879)	(21)
Net Income (Loss)	(256,534,214)	(256,534,100)	(114)
Net Change in Shareholders' Equity, value	(376,549,824)	$ (376,549,710)	(114)
Net Change in Shareholders' Equity, shares		(9,200,000)
Balance - Value at Sep. 30, 2020	1,052,107,259	$ 1,052,106,735	$ 524
Balance - Shares at Sep. 30, 2020		80,400,000	40
Balance - Value at Jun. 30, 2020	851,267,605	$ 851,267,113	$ 492
Balance - Shares at Jun. 30, 2020		69,200,000	40
Purchases of Shares - Value	173,286,373	$ 173,286,373
Purchases of Shares - Shares		13,200,000
Redemption of Shares - Value	(26,216,258)	$ (26,216,258)
Redemption of Shares - Shares		(2,000,000)
Net Increase (Decrease) due to Share Transactions, value	147,070,115	$ 147,070,115
Net Increase (Decrease) due to Share Transactions, shares		11,200,000
Net Income (Loss)
Net Investment Income (Loss)	(1,728,048)	$ (1,728,047)	$ (1)
Net Realized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts	(18,218,227)	(18,218,224)	(3)
Net Change in Unrealized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts	73,715,814	73,715,778	36
Net Income (Loss)	53,769,539	53,769,507	32
Net Change in Shareholders' Equity, value	200,839,654	$ 200,839,622	32
Net Change in Shareholders' Equity, shares		11,200,000
Balance - Value at Sep. 30, 2020	1,052,107,259	$ 1,052,106,735	$ 524
Balance - Shares at Sep. 30, 2020		80,400,000	40
Balance - Value at Dec. 31, 2020	1,341,324,637	$ 1,341,324,051	$ 586
Balance - Shares at Dec. 31, 2020		91,500,000	40
Purchases of Shares - Value	1,293,138,837	$ 1,293,138,837
Purchases of Shares - Shares		73,600,000
Redemption of Shares - Value	(774,877,762)	$ (774,877,762)
Redemption of Shares - Shares		(42,400,000)
Net Increase (Decrease) due to Share Transactions, value	518,261,075	$ 518,261,075
Net Increase (Decrease) due to Share Transactions, shares		31,200,000
Net Income (Loss)
Net Investment Income (Loss)	(13,133,496)	$ (13,133,491)	$ (5)
Net Realized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts	400,584,652	400,584,508	144
Net Change in Unrealized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts	227,905,499	227,905,417	82
Net Income (Loss)	615,356,655	615,356,434	221
Net Change in Shareholders' Equity, value	1,133,617,730	$ 1,133,617,509	221
Net Change in Shareholders' Equity, shares		31,200,000
Balance - Value at Sep. 30, 2021	2,474,942,367	$ 2,474,941,560	$ 807
Balance - Shares at Sep. 30, 2021		122,700,000	40
Balance - Value at Jun. 30, 2021	2,523,498,245	$ 2,523,497,476	$ 769
Balance - Shares at Jun. 30, 2021		131,200,000	40
Purchases of Shares - Value	148,256,354	$ 148,256,354
Purchases of Shares - Shares		7,800,000
Redemption of Shares - Value	(311,501,777)	$ (311,501,777)
Redemption of Shares - Shares		(16,300,000)
Net Increase (Decrease) due to Share Transactions, value	(163,245,423)	$ (163,245,423)
Net Increase (Decrease) due to Share Transactions, shares		(8,500,000)
Net Income (Loss)
Net Investment Income (Loss)	(5,121,794)	$ (5,121,792)	$ (2)
Net Realized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts	122,752,700	122,752,658	42
Net Change in Unrealized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts	(2,941,361)	(2,941,359)	(2)
Net Income (Loss)	114,689,545	114,689,507	38
Net Change in Shareholders' Equity, value	(48,555,878)	$ (48,555,916)	38
Net Change in Shareholders' Equity, shares		(8,500,000)
Balance - Value at Sep. 30, 2021	$ 2,474,942,367	$ 2,474,941,560	$ 807
Balance - Shares at Sep. 30, 2021		122,700,000	40