Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net Income (Loss)	$ 99,574,221	$ 176,046,309
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Cost of securities purchased	(3,011,434,334)	(5,600,380,689)
Proceeds from securities sold and matured	3,530,220,557	5,256,105,147
Cost of affiliated investments purchased	(2,309,633,070)	(2,393,876,828)
Proceeds from affiliated investments sold	2,388,424,582	2,305,904,962
Net accretion of discount on United States Treasury Obligations	(24,024,190)	(30,453,067)
Net realized (gain) loss on United States Treasury Obligations and Affiliated Investments	(32,242)	10,482
Net change in unrealized (gain) loss on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts	(26,949,632)	56,140,449
Change in operating assets and liabilities:
Dividends from affiliates	136,102	(136,395)
Variation margin - Commodity Futures Contracts	13,813,977	(9,607,221)
LME Commodity Futures Contracts	(13,942,706)	17,202,678
Management fees	(422,532)	120,825
Brokerage commissions and fees	4,447	567
Other receivables	17,077
Net cash provided by (used in) operating activities	645,752,257	(222,922,781)
Cash flows from financing activities:
Proceeds from purchases of Shares	51,179,193	1,162,886,795
Redemption of Shares	(677,971,167)	(945,903,578)
Decrease in payable for amount due to custodian, net	(18,960,283)
Net cash provided by (used in) financing activities	(645,752,257)	216,983,217
Net change in cash		(5,939,564)
Cash at beginning of period		5,939,564
Cash at end of period	0	0
Supplemental disclosure of cash flow information
Cash paid for interest	$ 290,361	$ 282,184