Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net Income (Loss)	$ (16,312,308)	$ (36,999,746)
Adjustments to reconcile net income (loss) to net cash provided by (used for) operating activities:
Cost of securities purchased	(350,511,697)	(910,381,564)
Proceeds from securities sold and matured	496,974,835	1,219,978,520
Cost of affiliated investments purchased	(202,634,646)
Proceeds from affiliated investments sold	173,324,020
Net accretion of discount on United States Treasury Obligations	(928,796)	(429,297)
Net realized (gain) loss on United States Treasury Obligations and Affiliated Investments	6,578	8,271
Net change in unrealized (gain) loss on United States Treasury Obligations, Affiliated Investments and Currency Futures Contracts	18,558	(63,817)
Change in operating receivables and liabilities:
Dividends from affiliates	(911)
Variation margin	(6,320,158)	6,576,040
Management fee	(49,060)	(202,206)
Brokerage commissions and fees	272	127
Net cash provided by (used for) operating activities	93,566,687	278,486,328
Cash flows from financing activities:
Proceeds from purchases of Shares	103,691,677	197,190,458
Redemption of Shares	(197,257,364)	(474,965,055)
Decrease in payable for amount due to custodian, net	(1,000)
Net cash provided by (used for) financing activities	(93,566,687)	(277,774,597)
Net change in cash		711,731
Cash at beginning of period		51,943,740
Cash at end of period		52,655,471
Supplemental disclosure of cash flow information
Cash paid for interest	$ 2,387	$ 4,974