Statement of Changes in Shareholders' Equity (Unaudited) - USD ($)	Total	General Shares [Member]	Shares [Member]
Balance - Value at Dec. 31, 2015	$ 1,133,614,816	$ 1,026	$ 1,133,613,790
Balance - Shares at Dec. 31, 2015		40	44,200,000
Purchases of Shares - Value	197,190,458		$ 197,190,458
Purchases of Shares - Shares			8,000,000
Redemption of Shares - Value	(474,965,055)		$ (474,965,055)
Redemption of Shares - Shares			(18,800,000)
Net Increase (Decrease) due to Share Transactions, value	(277,774,597)		$ (277,774,597)
Net Increase (Decrease) due to Share Transactions, shares			(10,800,000)
Net Income (Loss)
Net Investment Income (Loss)	(1,345,297)	$ (1)	$ (1,345,296)
Net Realized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Currency Futures Contracts	(11,243,824)	(14)	(11,243,810)
Net Change in Unrealized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Currency Futures Contracts	(24,410,625)	(30)	(24,410,595)
Net Income (Loss)	(36,999,746)	(45)	(36,999,701)
Net Change in Shareholders' Equity, value	(314,774,343)	(45)	$ (314,774,298)
Net Change in Shareholders' Equity, shares			(10,800,000)
Balance - Value at Mar. 31, 2016	818,840,473	$ 981	$ 818,839,492
Balance - Shares at Mar. 31, 2016		40	33,400,000
Balance - Value at Dec. 31, 2016	845,909,239	$ 1,057	$ 845,908,182
Balance - Shares at Dec. 31, 2016		40	32,000,000
Purchases of Shares - Value	103,691,677		$ 103,691,677
Purchases of Shares - Shares			4,000,000
Redemption of Shares - Value	(197,257,364)		$ (197,257,364)
Redemption of Shares - Shares			(7,600,000)
Net Increase (Decrease) due to Share Transactions, value	(93,565,687)		$ (93,565,687)
Net Increase (Decrease) due to Share Transactions, shares			(3,600,000)
Net Income (Loss)
Net Investment Income (Loss)	(528,048)	$ (1)	$ (528,047)
Net Realized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Currency Futures Contracts	(3,237,381)	(4)	(3,237,377)
Net Change in Unrealized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Currency Futures Contracts	(12,546,879)	(15)	(12,546,864)
Net Income (Loss)	(16,312,308)	(20)	(16,312,288)
Net Change in Shareholders' Equity, value	(109,877,995)	(20)	$ (109,877,975)
Net Change in Shareholders' Equity, shares			(3,600,000)
Balance - Value at Mar. 31, 2017	$ 736,031,244	$ 1,037	$ 736,030,207
Balance - Shares at Mar. 31, 2017		40	28,400,000