Schedule of Investments (Unaudited) - Treasury Bills and Money Market Fund - USD ($)		Sep. 30, 2019		Dec. 31, 2018
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity		102.23%		103.98%
United States Treasury Obligations, Value		$ 1,120,058,993		$ 1,614,425,920
Affiliated Investments, Value		316,613,685		395,084,923
Investments in Securities, Value		1,436,672,678		2,009,510,843
Investments in Securities, Cost		$ 1,435,894,371		$ 2,009,415,674
Affiliated Investments [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity		22.53%		20.44%
Affiliated Investments, Value		$ 316,613,685		$ 395,084,923
Affiliated Investments, at Cost		$ 316,137,781		$ 394,929,293
U.S. Treasury Bills, 2.025% due October 8, 2019 [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity	[1]	36.35%
United States Treasury Obligations, Value	[1]	$ 510,826,613
United States Treasury Obligations, Principal Value	[1]	$ 511,000,000
Investment Interest Rate	[1]	2.025%
Investment Maturity Date	[1]	Oct. 08, 2019
U.S. Treasury Bills, 2.210% due October 10, 2019 [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity	[1]	13.09%
United States Treasury Obligations, Value	[1]	$ 183,918,924
United States Treasury Obligations, Principal Value	[1]	$ 184,000,000
Investment Interest Rate	[1]	2.21%
Investment Maturity Date	[1]	Oct. 10, 2019
U.S. Treasury Bills, 1.945% due December 19, 2019 [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity	[1],[2]	28.92%
United States Treasury Obligations, Value	[1],[2]	$ 406,459,804
United States Treasury Obligations, Principal Value	[1],[2]	$ 408,000,000
Investment Interest Rate	[1],[2]	1.945%
Investment Maturity Date	[1],[2]	Dec. 19, 2019
Restricted for maintenance margin		$ 265,885,780
U.S. Treasury Bills, 1.825% due March 5, 2020 [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity	[1]	1.34%
United States Treasury Obligations, Value	[1]	$ 18,853,652
United States Treasury Obligations, Principal Value	[1]	$ 19,000,000
Investment Interest Rate	[1]	1.825%
Investment Maturity Date	[1]	Mar. 05, 2020
United States Treasury Obligations [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity	[1]	79.70%		83.54%
United States Treasury Obligations, Value	[1]	$ 1,120,058,993		$ 1,614,425,920
Investments in Securities, Cost		$ 1,119,756,590		$ 1,614,486,381
Exchange-Traded Fund [Member] | Affiliated Investments [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity	[3]	17.82%		12.94%
Affiliated Investments, Value	[3]	$ 250,466,130		$ 250,145,856
Affiliated Investments, Shares	[3]	2,372,400		2,372,400
Affiliated Investments, at Cost	[3]	$ 249,990,226		$ 249,990,226
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		4.71%	[4]	7.50%	[5]
Affiliated Investments, Value		$ 66,147,555	[4]	$ 144,939,067	[5]
Affiliated Investments, Shares		66,147,555	[4]	144,939,067	[5]
Investment Interest Rate		1.81%	[4]	2.30%	[5]
Affiliated Investments, at Cost		$ 66,147,555	[4]	$ 144,939,067	[5]
U.S. Treasury Bills, 2.175% due January 3, 2019 [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity	[1]			4.87%
United States Treasury Obligations, Value	[1]			$ 93,994,138
United States Treasury Obligations, Principal Value	[1]			$ 94,000,000
Investment Interest Rate	[1]			2.175%
Investment Maturity Date	[1]			Jan. 03, 2019
U.S. Treasury Bills, 2.370% due February 28, 2019 [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity	[1]			33.35%
United States Treasury Obligations, Value	[1]			$ 644,565,727
United States Treasury Obligations, Principal Value	[1]			$ 647,000,000
Investment Interest Rate	[1]			2.37%
Investment Maturity Date	[1]			Feb. 28, 2019
U.S. Treasury Bills, 2.465% due April 4, 2019 [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity	[1]			26.38%
United States Treasury Obligations, Value	[1]			$ 509,825,741
United States Treasury Obligations, Principal Value	[1]			$ 513,000,000
Investment Interest Rate	[1]			2.465%
Investment Maturity Date	[1]			Apr. 04, 2019
U.S. Treasury Bills, 2.430% due May 2, 2019 [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity	[1],[6]			18.94%
United States Treasury Obligations, Value	[1],[6]			$ 366,040,314
United States Treasury Obligations, Principal Value	[1],[6]			$ 369,000,000
Investment Interest Rate	[1],[6]			2.43%
Investment Maturity Date	[1],[6]			May 02, 2019
Restricted for maintenance margin				$ 255,836,800

[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 $265,885,780 are on deposit with the Commodity Broker and held as maintenance margin for open futures contracts.

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

[4] 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 September 30, 2019.

[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 December 31, 2018.

[6] United States Treasury Obligations of $255,836,800 are on deposit with the Commodity Broker and held as maintenance margin for open futures contracts.