Schedule of Investments (Unaudited) - Treasury Bills and Affiliated Investments - USD ($)		Mar. 31, 2020		Dec. 31, 2019
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity		99.73%		99.98%
United States Treasury Obligations, Value		$ 144,986,212		$ 147,718,751
Affiliated Investments, Value		144,775,016		200,021,832
Investments in Securities, Value		289,761,228		347,740,583
Investments in Securities, cost		$ 288,842,789		$ 347,580,306
Affiliated Investments [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity		49.83%		57.51%
Affiliated Investments, Value		$ 144,775,016		$ 200,021,832
Affiliated Investments, at Cost		$ 144,163,561		$ 199,897,682
U.S. Treasury Bills, 1.520% due April 2, 2020 [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity	[1]	3.79%		3.15%
United States Treasury Obligations, Value	[1]	$ 11,000,003		$ 10,957,736
United States Treasury Obligations, Principal Value	[1]	$ 11,000,000		$ 11,000,000
Investment Interest Rate	[1]	1.52%		1.52%	[2]
Investment Maturity Date	[1]	Apr. 02, 2020		Apr. 02, 2020	[2]
U.S. Treasury Bills, 1.505% due May 28, 2020 [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity	[1],[3]	46.11%
United States Treasury Obligations, Value	[1],[3]	$ 133,986,209
United States Treasury Obligations, Principal Value	[1],[3]	$ 134,000,000
Investment Interest Rate	[1]	1.505%
Investment Maturity Date	[1]	May 28, 2020
Restricted for maintenance margin		$ 49,995,000
United States Treasury Obligations [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity	[1]	49.90%		42.47%
United States Treasury Obligations, Value	[1]	$ 144,986,212		$ 147,718,751
Investments in Securities, cost		$ 144,679,228		$ 147,682,624
Exchange-Traded Fund [Member] | Affiliated Investments [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity	[4]	27.40%		22.75%
Affiliated Investments, Value	[4]	$ 79,610,643		$ 79,123,338
Affiliated Investments, Shares	[4]	749,700		749,700
Affiliated Investments, at Cost	[4]	$ 78,999,188		$ 78,999,188
Money Market Mutual Fund - Invesco Premier U.S. Government Money Portfolio - Institutional Class [Member] | Affiliated Investments [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity		22.43%	[5]	34.76%	[6]
Affiliated Investments, Value		$ 65,164,373	[5]	$ 120,898,494	[6]
Affiliated Investments, Shares		65,164,373	[5]	120,898,494	[6]
Investment Interest Rate		0.54%	[5]	1.47%	[6]
Affiliated Investments, at Cost		$ 65,164,373	[5]	$ 120,898,494	[6]
U.S. Treasury Bills, 1.560% due March 5, 2020 [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity	[1]			10.04%
United States Treasury Obligations, Value	[1]			$ 34,908,278
United States Treasury Obligations, Principal Value	[1]			$ 35,000,000
Investment Interest Rate	[1]			1.56%
Investment Maturity Date	[1]			Mar. 05, 2020
U.S. Treasury Bills, 1.520% due February 6, 2020 [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity	[1],[2]			29.28%
United States Treasury Obligations, Value	[1],[2]			$ 101,852,737
United States Treasury Obligations, Principal Value	[1],[2]			$ 102,000,000
Investment Interest Rate	[1]			1.52%
Investment Maturity Date	[1]			Feb. 06, 2020
Restricted for maintenance margin				$ 52,920,500

[1] Security may be traded on a discount basis. The interest rate shown represents the discount rate at the most recent auction date of the security prior to period end.

[2] United States Treasury Obligations of $52,920,500 are on deposit with the Commodity Broker and held as maintenance margin for open futures contracts.

[3] United States Treasury Obligations of $49,995,000 are on deposit with the Commodity Broker and held as maintenance margin for open futures contracts.

[4] Affiliated company. The security and the Fund are affiliated by having the same investment adviser. See Note 8.

[5] The security and the Fund are advised by wholly-owned subsidiaries of Invesco Ltd. and are therefore considered to be affiliated. The rate shown is the 7-day SEC standardized yield as of March 31, 2020.

[6] The security and the Fund are advised by wholly-owned subsidiaries of Invesco Ltd. and are therefore considered to be affiliated. The rate shown is the 7-day SEC standardized yield as of December 31, 2019.