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Condensed Schedule of Investments (Parenthetical)	3 Months Ended
	Mar. 31, 2016 USD ($)
Collateral Amount On Open Futures Contracts	$ 463,956,958
United States [Member] | US Treasury Bill Securities One [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.07%
Expiration date	4/7/2016
United States [Member] | US Treasury Bill Securities Two [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.07%
Expiration date	4/14/2016
United States [Member] | US Treasury Bill Securities Three [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.11%
Expiration date	4/21/2016
United States [Member] | US Treasury Bill Securities Four [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.21%
Expiration date	4/28/2016
United States [Member] | US Treasury Bill Securities Five [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.26%
Expiration date	5/5/2016
United States [Member] | US Treasury Bill Securities Six [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.33%
Expiration date	5/12/2016
United States [Member] | US Treasury Bill Securities Seven [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.31%
Expiration date	5/19/2016
United States [Member] | US Treasury Bill Securities Eight [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.35%
Expiration date	5/26/2016
United States [Member] | US Treasury Bill Securities Nine [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.43%
Expiration date	6/2/2016
United States [Member] | US Treasury Bill Securities Ten [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.52%
Expiration date	6/9/2016
United States [Member] | US Treasury Bill Securities Eleven [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.48%
Expiration date	6/16/2016
United States [Member] | US Treasury Bill Securities Twelve [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.46%
Expiration date	6/23/2016
United States [Member] | US Treasury Bill Securities Thirteen [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.45%
Expiration date	6/30/2016
United States [Member] | US Treasury Bill Securities Fourteen [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.32%
Expiration date	7/7/2016
United States [Member] | US Treasury Bill Securities Fifteen [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.32%
Expiration date	7/14/2016
United States [Member] | US Treasury Bill Securities Sixteen [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.38%
Expiration date	7/21/2016
United States [Member] | US Treasury Bill Securities Seventeen [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.43%
Expiration date	7/28/2016
United States [Member] | US Treasury Bill Securities Eighteen [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.42%
Expiration date	8/4/2016
United States [Member] | US Treasury Bill Securities Nineteen [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.41%
Expiration date	8/11/2016
United States [Member] | US Treasury Bill Securities Twenty [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.43%
Expiration date	8/18/2016
United States [Member] | US Treasury Bill Securities Twenty One [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.45%
Expiration date	8/25/2016
United States [Member] | US Treasury Bill Securities Twenty Two [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.48%
Expiration date	9/1/2016
United States [Member] | US Treasury Bill Securities Twenty Three [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.46%
Expiration date	9/8/2016
United States [Member] | US Treasury Bill Securities Twenty Four [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.45%
Expiration date	9/15/2016
United States [Member] | US Treasury Bill Securities Twenty Five [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.44%
Expiration date	9/22/2016
United States [Member] | US Treasury Bill Securities Twenty Six [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.38%
Expiration date	9/29/2016

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Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 6
-Subparagraph (SX 210.12-14.4(b))
-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611322-123010

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 5
-Subparagraph (SX 210.12-13.5(d))
-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611282-123010

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