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Schedule of Investments (Parenthetical) (United States) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
NYMEX Crude Oil Futures CL February 2013 contracts, expiring January 2013 | Open Cleared Swap and Futures Contracts | Open Futures Contracts, Long |  |
Expiration date | January 2013 |
NYMEX Crude Oil Futures CL March 2013 contracts, expiring February 2013 | Open Cleared Swap and Futures Contracts | Open Futures Contracts, Long |  |
Expiration date | February 2013 |
NYMEX Crude Oil Futures CL April 2013 contracts, expiring March 2013 | Open Cleared Swap and Futures Contracts | Open Futures Contracts, Long |  |
Expiration date | March 2013 |
Nymex Crude Oil Futures CL May 2013 Contracts Expiring April 2013 | Open Cleared Swap and Futures Contracts | Open Futures Contracts, Long |  |
Expiration date | April 2013 |
Nymex Crude Oil Futures CL June 2013 Contracts Expiring May 2013 | Open Cleared Swap and Futures Contracts | Open Futures Contracts, Long |  |
Expiration date | May 2013 |
Nymex Crude Oil Futures CL July 2013 Contracts Expiring June 2013 | Open Cleared Swap and Futures Contracts | Open Futures Contracts, Long |  |
Expiration date | June 2013 |
Nymex Crude Oil Futures CL August 2013 Contracts Expiring July 2013 | Open Cleared Swap and Futures Contracts | Open Futures Contracts, Long |  |
Expiration date | July 2013 |
Nymex Crude Oil Futures CL September 2013 Contracts Expiring August 2013 | Open Cleared Swap and Futures Contracts | Open Futures Contracts, Long |  |
Expiration date | August 2013 |
Nymex Crude Oil Futures CL October 2013 Contracts Expiring September 2013 | Open Cleared Swap and Futures Contracts | Open Futures Contracts, Long |  |
Expiration date | September 2013 |
Nymex Crude Oil Futures CL November 2013 Contracts Expiring October 2013 | Open Cleared Swap and Futures Contracts | Open Futures Contracts, Long |  |
Expiration date | October 2013 |
Nymex Crude Oil Futures CL December 2013 Contracts Expiring November 2013 | Open Cleared Swap and Futures Contracts | Open Futures Contracts, Long |  |
Expiration date | November 2013 |
Nymex Crude Oil Futures CL January 2014 Contracts Expiring December 2013 | Open Cleared Swap and Futures Contracts | Open Futures Contracts, Long |  |
Expiration date | December 2013 |
U.S. Treasury Bill | US Treasury Securities | Cash Equivalents |  |
Interest rate | 0.10% | 0.03%
Expiration date | 1/17/2013 | 6/21/2012
NYMEX Crude Oil Futures CL February 2012 contracts, expiring January 2012 | Open Cleared Swap and Futures Contracts | Open Futures Contracts, Long |  |
Expiration date |  | January 2012
NYMEX Crude Oil Futures CL March 2012 contracts, expiring February 2012 | Open Cleared Swap and Futures Contracts | Open Futures Contracts, Long |  |
Expiration date |  | February 2012
NYMEX Crude Oil Futures CL April 2012 contracts, expiring March 2012 | Open Cleared Swap and Futures Contracts | Open Futures Contracts, Long |  |
Expiration date |  | March 2012
NYMEX Crude Oil Futures CL May 2012 contracts, expiring April 2012 | Open Cleared Swap and Futures Contracts | Open Futures Contracts, Long |  |
Expiration date |  | April 2012
NYMEX Crude Oil Futures CL June 2012 contracts, expiring May 2012 | Open Cleared Swap and Futures Contracts | Open Futures Contracts, Long |  |
Expiration date |  | May 2012
NYMEX Crude Oil Futures CL July 2012 contracts, expiring June 2012 | Open Cleared Swap and Futures Contracts | Open Futures Contracts, Long |  |
Expiration date |  | June 2012
NYMEX Crude Oil Futures CL August 2012 contracts, expiring July 2012 | Open Cleared Swap and Futures Contracts | Open Futures Contracts, Long |  |
Expiration date |  | July 2012
NYMEX Crude Oil Futures CL September 2012 contracts, expiring August 2012 | Open Cleared Swap and Futures Contracts | Open Futures Contracts, Long |  |
Expiration date |  | August 2012
NYMEX Crude Oil Futures CL October 2012 contracts, expiring September 2012 | Open Cleared Swap and Futures Contracts | Open Futures Contracts, Long |  |
Expiration date |  | September 2012
NYMEX Crude Oil Futures CL November 2012 contracts, expiring October 2012 | Open Cleared Swap and Futures Contracts | Open Futures Contracts, Long |  |
Expiration date |  | October 2012
NYMEX Crude Oil Futures CL December 2012 contracts, expiring November 2012 | Open Cleared Swap and Futures Contracts | Open Futures Contracts, Long |  |
Expiration date |  | November 2012
NYMEX Crude Oil Futures CL January 2013 contracts, expiring December 2012 | Open Cleared Swap and Futures Contracts | Open Futures Contracts, Long |  |
Expiration date |  | December 2012

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