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Schedule of Investments [Parenthetical] (United States) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Cash Equivalents [Member] | Us Treasury Bill Securities [Member] |  |
Interest rate | 0.10% | 0.03%
Expiration date | 17 January 2013 | 21 June 2012
Open Futures Contracts - Long | ICE Brent Crude Oil Futures CO February 2013 contracts and February 2012 contracts, expiring January 2013 and expiring January 2012 |  |
Expiration date | January 2013 | January 2012

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