Schedule of Investments - Futures Contracts		12 Months Ended
		Dec. 31, 2019 USD ($) Contract	Dec. 31, 2018 USD ($) Contract
Schedule of Investments [Line Items]
Currency Futures Contracts, Value		$ 229,276,654	$ 511,601,546
Futures [Member] | United States of America, Dollars [Member] | Long [Member]
Schedule of Investments [Line Items]
Currency Futures Contracts, Number of Contracts | Contract		2,377	5,164
Currency Futures Contracts, Expiration Date		Mar. 31, 2020	Mar. 31, 2019
Currency Futures Contracts, Notional Value		$ 228,329,866	$ 494,375,540
Currency Futures Contracts, Value	[1]	(1,815,323)	(4,534,517)
Currency Futures Contracts, Unrealized Appreciation (Depreciation)	[1]	$ (1,815,323)	$ (4,534,517)

[1] Unrealized Appreciation (Depreciation) and Value are presented above, net by contract.