Statements of Income and Expenses - USD ($)		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income
Interest Income		$ 6,308,729	$ 715,663	$ 1,840,717
Dividends from Affiliates		139,113
Total Income		6,447,842	715,663	1,840,717
Expenses
Management Fee		19,189,799	24,818,382	45,609,981
Brokerage Commissions and Fees		759,634	1,171,437	1,428,704
Interest Expense	[1]	141,261	277,439
Total Expenses		20,090,694	26,267,258	47,038,685
Less: Waivers		(68,552)
Net Expenses		20,022,142	26,267,258	47,038,685
Net Investment Income (Loss)		(13,574,300)	(25,551,595)	(45,197,968)
Net Realized Gain (Loss) on
United States Treasury Obligations		19,938	14,586	39,941
Commodity Futures Contracts		(72,730,527)	(1,272,167,944)	(746,348,836)
Net Realized Gain (Loss)		(72,710,589)	(1,272,153,358)	(746,308,895)
Net Change in Unrealized Gain (Loss) on
United States Treasury Obligations		(56,173)	(53,402)	(96,282)
Commodity Futures Contracts		452,312,410	423,877,671	(812,410,338)
Net Change in Unrealized Gain (Loss)		452,256,237	423,824,269	(812,506,620)
Net Realized and Net Change in Unrealized Gain (Loss) on United States Treasury Obligations and Commodity Futures Contracts		379,545,648	(848,329,089)	(1,558,815,515)
Net Income (Loss)		$ 365,971,348	$ (873,880,684)	$ (1,604,013,483)

[1] Interest Expense for the years ended December 31, 2016 and 2015 represents interest expense on overdraft balances. These amounts are included in Interest Income for the year ended December 31, 2014.