Schedule of Investments (Unaudited) - Futures Contracts - USD ($)		Jun. 30, 2016	Dec. 31, 2015
FNX-ICE Dollar Index (8,695 Contracts, Settlement Date September 19, 2016) [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity		2.45%
Unrealized Appreciation/ (Depreciation)	[1]	$ 20,456,580
Notional Market Value		$ 836,485,085
Currency Futures Contracts [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity		2.45%	0.80%
Unrealized Appreciation/ (Depreciation)	[1]	$ 20,456,580	$ 9,076,613
Notional Market Value		$ 836,485,085	$ 1,133,790,090
FNX-ICE Dollar Index (11,482 Contracts, Settlement Date March 14, 2016) [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity			0.80%
Unrealized Appreciation/ (Depreciation)	[1]		$ 9,076,613
Notional Market Value			$ 1,133,790,090

[1] Unrealized appreciation/(depreciation) is presented above, net by contract.