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	280,127,393		$ 280,127,393
Purchases of Shares - Shares			11,400,000
Redemption of Shares - Value	(553,779,990)		$ (553,779,990)
Redemption of Shares - Shares			(22,000,000)
Net Increase (Decrease) due to Share Transactions, value	(273,652,597)		$ (273,652,597)
Net Increase (Decrease) due to Share Transactions, shares			(10,600,000)
Net Income (Loss)
Net Investment Income (Loss)	(2,425,242)	$ (3)	$ (2,425,239)
Net Realized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Currency Futures Contracts	(32,508,401)	(42)	(32,508,359)
Net Change in Unrealized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Currency Futures Contracts	11,394,178	15	11,394,163
Net Income (Loss)	(23,539,465)	(30)	(23,539,435)
Net Change in Shareholders' Equity, value	(297,192,062)	(30)	$ (297,192,032)
Net Change in Shareholders' Equity, shares			(10,600,000)
Balance - Value at Jun. 30, 2016	836,422,754	$ 996	$ 836,421,758
Balance - Shares at Jun. 30, 2016		40	33,600,000
Balance - Value at Mar. 31, 2016	818,840,473	$ 981	$ 818,839,492
Balance - Shares at Mar. 31, 2016		40	33,400,000
Purchases of Shares - Value	82,936,935		$ 82,936,935
Purchases of Shares - Shares			3,400,000
Redemption of Shares - Value	(78,814,935)		$ (78,814,935)
Redemption of Shares - Shares			(3,200,000)
Net Increase (Decrease) due to Share Transactions, value	4,122,000		$ 4,122,000
Net Increase (Decrease) due to Share Transactions, shares			200,000
Net Income (Loss)
Net Investment Income (Loss)	(1,079,945)	$ (2)	$ (1,079,943)
Net Realized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Currency Futures Contracts	(21,264,577)	(28)	(21,264,549)
Net Change in Unrealized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Currency Futures Contracts	35,804,803	45	35,804,758
Net Income (Loss)	13,460,281	15	13,460,266
Net Change in Shareholders' Equity, value	17,582,281	15	$ 17,582,266
Net Change in Shareholders' Equity, shares			200,000
Balance - Value at Jun. 30, 2016	836,422,754	$ 996	$ 836,421,758
Balance - Shares at Jun. 30, 2016		40	33,600,000
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	145,526,202		$ 145,526,202
Purchases of Shares - Shares			5,600,000
Redemption of Shares - Value	(405,809,198)		$ (405,809,198)
Redemption of Shares - Shares			(15,800,000)
Net Increase (Decrease) due to Share Transactions, value	(260,282,996)		$ (260,282,996)
Net Increase (Decrease) due to Share Transactions, shares			(10,200,000)
Net Income (Loss)
Net Investment Income (Loss)	(585,341)	$ (1)	$ (585,340)
Net Realized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Currency Futures Contracts	(35,646,694)	(52)	(35,646,642)
Net Change in Unrealized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Currency Futures Contracts	(9,789,468)	(14)	(9,789,454)
Net Income (Loss)	(46,021,503)	(67)	(46,021,436)
Net Change in Shareholders' Equity, value	(306,304,499)	(67)	$ (306,304,432)
Net Change in Shareholders' Equity, shares			(10,200,000)
Balance - Value at Jun. 30, 2017	539,604,740	$ 990	$ 539,603,750
Balance - Shares at Jun. 30, 2017		40	21,800,000
Balance - Value at Mar. 31, 2017	736,031,244	$ 1,037	$ 736,030,207
Balance - Shares at Mar. 31, 2017		40	28,400,000
Purchases of Shares - Value	41,834,525		$ 41,834,525
Purchases of Shares - Shares			1,600,000
Redemption of Shares - Value	(208,551,834)		$ (208,551,834)
Redemption of Shares - Shares			(8,200,000)
Net Increase (Decrease) due to Share Transactions, value	(166,717,309)		$ (166,717,309)
Net Increase (Decrease) due to Share Transactions, shares			(6,600,000)
Net Income (Loss)
Net Investment Income (Loss)	(57,293)		$ (57,293)
Net Realized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Currency Futures Contracts	(32,409,313)	$ (48)	(32,409,265)
Net Change in Unrealized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Currency Futures Contracts	2,757,411	1	2,757,410
Net Income (Loss)	(29,709,195)	(47)	(29,709,148)
Net Change in Shareholders' Equity, value	(196,426,504)	(47)	$ (196,426,457)
Net Change in Shareholders' Equity, shares			(6,600,000)
Balance - Value at Jun. 30, 2017	$ 539,604,740	$ 990	$ 539,603,750
Balance - Shares at Jun. 30, 2017		40	21,800,000