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Condensed Schedule of Investments (USD $)	Mar. 31, 2015
Market Values	$ 60,987,238
% of Partners' Capital	56.20%bno_PercentageOfPartnersCapital
Cash Equivalents [Member] \| US Treasury Securities [Member]
Market Values	50,987,238
% of Partners' Capital	46.98%
Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S. Treasury Bills,0.05%, 4/23/2015 [Member]
Principal Amount	4,000,000
Market Values	3,999,878
% of Partners' Capital	3.69%
Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S. Treasury Bills,0.07, 5/21/2015 [Member]
Principal Amount	4,000,000
Market Values	3,999,639
% of Partners' Capital	3.69%
Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S. Treasury Bills,0.10, 6/25/2015 [Member]
Principal Amount	5,000,000
Market Values	4,998,878
% of Partners' Capital	4.61%
Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S. Treasury Bills,0.05, 7/09/2015 [Member]
Principal Amount	3,000,000
Market Values	2,999,629
% of Partners' Capital	2.76%
Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S. Treasury Bills,0.08, 7/23/2015 [Member]
Principal Amount	5,000,000
Market Values	4,998,823
% of Partners' Capital	4.61%
Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S. Treasury Bills,0.06, 7/30/2015 [Member]
Principal Amount	3,000,000
Market Values	2,999,450
% of Partners' Capital	2.76%
Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S. Treasury Bills,0.06, 8/06/2015 [Member]
Principal Amount	2,000,000
Market Values	1,999,612
% of Partners' Capital	1.84%
Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S. Treasury Bills,0.07, 8/13/2015 [Member]
Principal Amount	3,000,000
Market Values	2,999,274
% of Partners' Capital	2.76%
Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S. Treasury Bills,0.07, 8/20/2015 [Member]
Principal Amount	4,000,000
Market Values	3,998,982
% of Partners' Capital	3.68%
Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S. Treasury Bills,0.07, 8/27/2015 [Member]
Principal Amount	5,000,000
Market Values	4,998,664
% of Partners' Capital	4.61%
Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S. Treasury Bills,0.08, 9/03/2015 [Member]
Principal Amount	5,000,000
Market Values	4,998,385
% of Partners' Capital	4.61%
Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S. Treasury Bills,0.10, 9/10/2015 [Member]
Principal Amount	3,000,000
Market Values	2,998,717
% of Partners' Capital	2.76%
Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S. Treasury Bills,0.12, 9/17/2015 [Member]
Principal Amount	2,000,000
Market Values	1,998,920
% of Partners' Capital	1.84%
Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S. Treasury Bills,0.11, 9/24/2015 [Member]
Principal Amount	3,000,000
Market Values	2,998,387
% of Partners' Capital	2.76%
Cash Equivalents [Member] \| United States [Member] \| Money Market Funds [Member] \| Morgan Stanley Institutional Liquidity Fund - Government Portfolio [Member]
Principal Amount	10,000,000
Market Values	10,000,000
% of Partners' Capital	9.22%
Open Futures Contracts - Long [Member] \| United States [Member] \| ICE Brent Crude Oil Futures C0 May 2015 contracts, expiring April 15, 2015 [Member]
Number of Contracts	1,969
Unrealized Loss on Open Commodity Contracts	$ (10,535,860)
% of Partners' Capital	(9.71%)

- Definition

Balance held at close of period in number of contracts.

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- Definition

For investments which are quantified by principal amount, the principle balance held at close of period.

+ References+ Details