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Contracts And Agreements (Tables)
 12 Months Ended
Dec. 31, 2014
Contractors [Abstract]  
Brokerage Commissions
BNO also incurs commissions to brokers for the purchase and sale of Futures Contracts, Other Crude Oil-Related Investments or short term obligations of the United States of two years or less (“Treasuries”).
 
 
 
For the Year Ended
 
 
For the Year Ended
 
 
For the Year Ended
 
 
 
December 31, 2014
 
 
December 31, 2013
 
 
December 31, 2012
 
Total commissions accrued to brokers
 
$
27,058
 
 
$
29,674
 
 
$
33,506
 
Total commissions as annualized percentage of average total net assets
 
 
0.07
%
 
 
0.07
%
 
 
0.06
%
Commissions accrued as a result of rebalancing
 
$
24,246
 
 
$
24,097
 
 
$
29,561
 
Percentage of commissions accrued as a result of rebalancing
 
 
89.61
%
 
 
81.21
%
 
 
88.23
%
Commissions accrued as a result of creation and redemption activity
 
$
2,812
 
 
$
5,577
 
 
$
3,945
 
Percentage of commissions accrued as a result of creation and redemption activity
 
 
10.39
%
 
 
18.79
%
 
 
11.77
%