Schedule of Investments (Unaudited) - Futures Contracts - USD ($)		Mar. 31, 2016	Dec. 31, 2015
FNX-ICE Dollar Index (8,658 contracts, settlement date June 13, 2016) [Member]
Investment Holdings [Line Items]
Percentage of Shareholders' Equity		1.88%
Unrealized Appreciation/ (Depreciation)	[1]	$ (15,397,829)
Notional Market Value		$ 818,856,324
Currency Futures Contracts [Member]
Investment Holdings [Line Items]
Percentage of Shareholders' Equity		1.88%	0.80%
Unrealized Appreciation/ (Depreciation)	[1]	$ (15,397,829)	$ 9,076,613
Notional Market Value		$ 818,856,324	$ 1,133,790,090
FNX-ICE Dollar Index (11,482 Contracts, Settlement Date March 14, 2016) [Member]
Investment Holdings [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.