Schedule of Investments (Unaudited) - Futures Contracts (Parenthetical) - Contract	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
FNX-ICE Dollar Index (8,695 Contracts, Settlement Date September 19, 2016) [Member]
Schedule of Investments [Line Items]
Open Future Contracts Written, Number of Contracts	8,695
Futures Contract Indexed to Issuer's Equity, Settlement Date or Dates	Sep. 19, 2016
FNX-ICE Dollar Index (11,482 Contracts, Settlement Date March 14, 2016) [Member]
Schedule of Investments [Line Items]
Open Future Contracts Written, Number of Contracts		11,482
Futures Contract Indexed to Issuer's Equity, Settlement Date or Dates		Mar. 14, 2016