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	264,778,174		$ 264,778,174
Purchases of Shares - Shares			11,000,000
Redemption of Shares - Value	(311,096,626)		$ (311,096,626)
Redemption of Shares - Shares			(12,800,000)
Net Increase (Decrease) due to Share Transactions, value	(46,318,452)		$ (46,318,452)
Net Increase (Decrease) due to Share Transactions, shares			(1,800,000)
Net Income (Loss)
Net Investment Income (Loss)	1,512,758	$ 3	$ 1,512,755
Net Realized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Currency Futures Contracts	9,672,397	15	9,672,382
Net Change in Unrealized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Currency Futures Contracts	11,754,303	21	11,754,282
Net Income (Loss)	22,939,458	39	22,939,419
Net Change in Shareholders' Equity, value	(23,378,994)	39	$ (23,379,033)
Net Change in Shareholders' Equity, shares			(1,800,000)
Balance - Value at Jun. 30, 2018	509,348,559	$ 999	$ 509,347,560
Balance - Shares at Jun. 30, 2018		40	20,400,000
Balance - Value at Mar. 31, 2018	500,822,145	$ 945	$ 500,821,200
Balance - Shares at Mar. 31, 2018		40	21,200,000
Purchases of Shares - Value	194,787,610		$ 194,787,610
Purchases of Shares - Shares			8,000,000
Redemption of Shares - Value	(216,837,994)		$ (216,837,994)
Redemption of Shares - Shares			(8,800,000)
Net Increase (Decrease) due to Share Transactions, value	(22,050,384)		$ (22,050,384)
Net Increase (Decrease) due to Share Transactions, shares			(800,000)
Net Income (Loss)
Net Investment Income (Loss)	939,113	$ 2	$ 939,111
Net Realized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Currency Futures Contracts	28,401,074	52	28,401,022
Net Change in Unrealized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Currency Futures Contracts	1,236,611		1,236,611
Net Income (Loss)	30,576,798	54	30,576,744
Net Change in Shareholders' Equity, value	8,526,414	54	$ 8,526,360
Net Change in Shareholders' Equity, shares			(800,000)
Balance - Value at Jun. 30, 2018	509,348,559	$ 999	$ 509,347,560
Balance - Shares at Jun. 30, 2018		40	20,400,000
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	62,419,533		$ 62,419,533
Purchases of Shares - Shares			2,400,000
Redemption of Shares - Value	(241,771,981)		$ (241,771,981)
Redemption of Shares - Shares			(9,400,000)
Net Increase (Decrease) due to Share Transactions, value	(179,352,448)		$ (179,352,448)
Net Increase (Decrease) due to Share Transactions, shares			(7,000,000)
Net Income (Loss)
Net Investment Income (Loss)	3,143,599	$ 9	$ 3,143,590
Net Realized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Currency Futures Contracts	1,499,804	4	1,499,800
Net Change in Unrealized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Currency Futures Contracts	2,291,838	6	2,291,832
Net Income (Loss)	6,935,241	19	6,935,222
Net Change in Shareholders' Equity, value	(172,417,207)	19	$ (172,417,226)
Net Change in Shareholders' Equity, shares			(7,000,000)
Balance - Value at Jun. 30, 2019	321,935,385	$ 1,038	$ 321,934,347
Balance - Shares at Jun. 30, 2019		40	12,400,000
Balance - Value at Mar. 31, 2019	374,764,956	$ 1,041	$ 374,763,915
Balance - Shares at Mar. 31, 2019		40	14,400,000
Purchases of Shares - Value	47,087,070		$ 47,087,070
Purchases of Shares - Shares			1,800,000
Redemption of Shares - Value	(99,125,797)		$ (99,125,797)
Redemption of Shares - Shares			(3,800,000)
Net Increase (Decrease) due to Share Transactions, value	(52,038,727)		$ (52,038,727)
Net Increase (Decrease) due to Share Transactions, shares			(2,000,000)
Net Income (Loss)
Net Investment Income (Loss)	1,556,477	$ 4	$ 1,556,473
Net Realized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Currency Futures Contracts	2,451,847	7	2,451,840
Net Change in Unrealized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Currency Futures Contracts	(4,799,168)	(14)	(4,799,154)
Net Income (Loss)	(790,844)	(3)	(790,841)
Net Change in Shareholders' Equity, value	(52,829,571)	(3)	$ (52,829,568)
Net Change in Shareholders' Equity, shares			(2,000,000)
Balance - Value at Jun. 30, 2019	$ 321,935,385	$ 1,038	$ 321,934,347
Balance - Shares at Jun. 30, 2019		40	12,400,000