Statement of Changes in Shareholders' Equity (Unaudited) - USD ($)	Total	General Shares [Member]	Shares [Member]
Balance - Value at Dec. 31, 2017	$ 532,727,553	$ 960	$ 532,726,593
Balance - Shares at Dec. 31, 2017		40	22,200,000
Purchases of Shares - Value	69,990,564		$ 69,990,564
Purchases of Shares - Shares			3,000,000
Redemption of Shares - Value	(94,258,632)		$ (94,258,632)
Redemption of Shares - Shares			(4,000,000)
Net Increase (Decrease) due to Share Transactions, value	(24,268,068)		$ (24,268,068)
Net Increase (Decrease) due to Share Transactions, shares			(1,000,000)
Net Income (Loss)
Net Investment Income (Loss)	573,645	$ 1	$ 573,644
Net Realized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Currency Futures Contracts	(18,728,677)	(37)	(18,728,640)
Net Change in Unrealized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Currency Futures Contracts	10,517,692	21	10,517,671
Net Income (Loss)	(7,637,340)	(15)	(7,637,325)
Net Change in Shareholders' Equity, value	(31,905,408)	(15)	$ (31,905,393)
Net Change in Shareholders' Equity, shares			(1,000,000)
Balance - Value at Mar. 31, 2018	500,822,145	$ 945	$ 500,821,200
Balance - Shares at Mar. 31, 2018		40	21,200,000
Balance - Value at Dec. 31, 2018	494,352,592	$ 1,019	$ 494,351,573
Balance - Shares at Dec. 31, 2018		40	19,400,000
Purchases of Shares - Value	15,332,463		$ 15,332,463
Purchases of Shares - Shares			600,000
Redemption of Shares - Value	(142,646,184)		$ (142,646,184)
Redemption of Shares - Shares			(5,600,000)
Net Increase (Decrease) due to Share Transactions, value	(127,313,721)		$ (127,313,721)
Net Increase (Decrease) due to Share Transactions, shares			(5,000,000)
Net Income (Loss)
Net Investment Income (Loss)	1,587,122	$ 5	$ 1,587,117
Net Realized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Currency Futures Contracts	(952,043)	(3)	(952,040)
Net Change in Unrealized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Currency Futures Contracts	7,091,006	20	7,090,986
Net Income (Loss)	7,726,085	22	7,726,063
Net Change in Shareholders' Equity, value	(119,587,636)	22	$ (119,587,658)
Net Change in Shareholders' Equity, shares			(5,000,000)
Balance - Value at Mar. 31, 2019	$ 374,764,956	$ 1,041	$ 374,763,915
Balance - Shares at Mar. 31, 2019		40	14,400,000