Schedule of Investments (Unaudited) - Futures Contracts		9 Months Ended	12 Months Ended
		Sep. 30, 2019 USD ($) Contract	Dec. 31, 2018 USD ($) Contract
Schedule of Investments [Line Items]
Commodity Futures Contracts, Value		$ 1,436,672,678	$ 2,009,510,843
Futures [Member] | Long [Member]
Schedule of Investments [Line Items]
Commodity Futures Contracts, Value	[1]	(61,825,713)	(243,800,174)
Commodity Futures Contracts, Unrealized Appreciation (Depreciation)	[1]	$ (61,825,713)	$ (243,800,174)
Futures [Member] | Long [Member] | CBOT Corn [Member]
Schedule of Investments [Line Items]
Commodity Futures Contracts, Number of Contracts | Contract		4,233	6,161
Commodity Futures Contracts, Expiration Date		Sep. 30, 2020	Sep. 30, 2019
Commodity Futures Contracts, Notional Value		$ 85,612,425	$ 121,217,675
Commodity Futures Contracts, Value	[1]	(2,783,223)	(4,115,659)
Commodity Futures Contracts, Unrealized Appreciation (Depreciation)	[1]	$ (2,783,223)	$ (4,115,659)
Futures [Member] | Long [Member] | CBOT Soybean [Member]
Schedule of Investments [Line Items]
Commodity Futures Contracts, Number of Contracts | Contract		1,878	2,652
Commodity Futures Contracts, Expiration Date		Nov. 30, 2019	Nov. 30, 2019
Commodity Futures Contracts, Notional Value		$ 85,073,400	$ 124,014,150
Commodity Futures Contracts, Value	[1]	(2,537,064)	513,337
Commodity Futures Contracts, Unrealized Appreciation (Depreciation)	[1]	$ (2,537,064)	$ 513,337
Futures [Member] | Long [Member] | CBOT Wheat [Member]
Schedule of Investments [Line Items]
Commodity Futures Contracts, Number of Contracts | Contract		3,001	4,579
Commodity Futures Contracts, Expiration Date		Jul. 31, 2020	Jul. 31, 2019
Commodity Futures Contracts, Notional Value		$ 76,638,038	$ 118,710,575
Commodity Futures Contracts, Value	[1]	(4,877,893)	(16,075,643)
Commodity Futures Contracts, Unrealized Appreciation (Depreciation)	[1]	$ (4,877,893)	$ (16,075,643)
Futures [Member] | Long [Member] | CME SWAPS MARKETS (COMEX) Gold [Member]
Schedule of Investments [Line Items]
Commodity Futures Contracts, Number of Contracts | Contract		980	1,425
Commodity Futures Contracts, Expiration Date		Feb. 29, 2020	Feb. 28, 2019
Commodity Futures Contracts, Notional Value		$ 145,000,800	$ 182,585,250
Commodity Futures Contracts, Value	[1]	14,955,627	4,757,025
Commodity Futures Contracts, Unrealized Appreciation (Depreciation)	[1]	$ 14,955,627	$ 4,757,025
Futures [Member] | Long [Member] | CME SWAPS MARKETS (COMEX) Silver [Member]
Schedule of Investments [Line Items]
Commodity Futures Contracts, Number of Contracts | Contract		410	600
Commodity Futures Contracts, Expiration Date		May 31, 2020	May 31, 2019
Commodity Futures Contracts, Notional Value		$ 35,272,300	$ 46,878,000
Commodity Futures Contracts, Value	[1]	3,150,812	2,594,092
Commodity Futures Contracts, Unrealized Appreciation (Depreciation)	[1]	$ 3,150,812	$ 2,594,092
Futures [Member] | Long [Member] | ICE FUTURES EUROPE Brent Crude Oil [Member]
Schedule of Investments [Line Items]
Commodity Futures Contracts, Number of Contracts | Contract		2,701	3,816
Commodity Futures Contracts, Expiration Date		Nov. 30, 2019	Nov. 30, 2019
Commodity Futures Contracts, Notional Value		$ 157,954,480	$ 210,834,000
Commodity Futures Contracts, Value	[1]	(32,651,849)	(61,104,242)
Commodity Futures Contracts, Unrealized Appreciation (Depreciation)	[1]	$ (32,651,849)	$ (61,104,242)
Futures [Member] | Long [Member] | LME CLEAR Aluminum [Member]
Schedule of Investments [Line Items]
Commodity Futures Contracts, Number of Contracts | Contract		1,263	1,791
Commodity Futures Contracts, Expiration Date		Jan. 31, 2020	Oct. 31, 2019
Commodity Futures Contracts, Notional Value		$ 54,230,063	$ 85,027,725
Commodity Futures Contracts, Value	[1]	(2,262,394)	(8,383,194)
Commodity Futures Contracts, Unrealized Appreciation (Depreciation)	[1]	$ (2,262,394)	$ (8,383,194)
Futures [Member] | Long [Member] | LME CLEAR Copper [Member]
Schedule of Investments [Line Items]
Commodity Futures Contracts, Number of Contracts | Contract		419	595
Commodity Futures Contracts, Expiration Date		Nov. 30, 2019	Feb. 28, 2019
Commodity Futures Contracts, Notional Value		$ 59,896,050	$ 88,770,281
Commodity Futures Contracts, Value	[1]	(10,750)	(14,524,306)
Commodity Futures Contracts, Unrealized Appreciation (Depreciation)	[1]	$ (10,750)	$ (14,524,306)
Futures [Member] | Long [Member] | LME CLEAR Zinc [Member]
Schedule of Investments [Line Items]
Commodity Futures Contracts, Number of Contracts | Contract		1,060	1,463
Commodity Futures Contracts, Expiration Date		Jan. 31, 2020	Mar. 31, 2019
Commodity Futures Contracts, Notional Value		$ 63,030,250	$ 90,358,537
Commodity Futures Contracts, Value	[1]	1,462,763	(4,169,375)
Commodity Futures Contracts, Unrealized Appreciation (Depreciation)	[1]	$ 1,462,763	$ (4,169,375)
Futures [Member] | Long [Member] | ICE FUTURES U.S. Sugar [Member]
Schedule of Investments [Line Items]
Commodity Futures Contracts, Number of Contracts | Contract		5,114	8,266
Commodity Futures Contracts, Expiration Date		Sep. 30, 2020	Sep. 30, 2019
Commodity Futures Contracts, Notional Value		$ 74,688,947	$ 116,001,738
Commodity Futures Contracts, Value	[1]	2,829,828	(788,761)
Commodity Futures Contracts, Unrealized Appreciation (Depreciation)	[1]	$ 2,829,828	$ (788,761)
Futures [Member] | Long [Member] | CME SWAPS MARKETS (NYMEX) Natural Gas [Member]
Schedule of Investments [Line Items]
Commodity Futures Contracts, Number of Contracts | Contract		3,252	4,463
Commodity Futures Contracts, Expiration Date		Apr. 30, 2020	Apr. 30, 2019
Commodity Futures Contracts, Notional Value		$ 73,592,760	$ 119,251,360
Commodity Futures Contracts, Value	[1]	(10,748,068)	1,564,207
Commodity Futures Contracts, Unrealized Appreciation (Depreciation)	[1]	$ (10,748,068)	$ 1,564,207
Futures [Member] | Long [Member] | CME SWAPS MARKETS (NYMEX) NY Harbor ULSD [Member]
Schedule of Investments [Line Items]
Commodity Futures Contracts, Number of Contracts | Contract		2,172	3,046
Commodity Futures Contracts, Expiration Date		May 31, 2020	May 31, 2019
Commodity Futures Contracts, Notional Value		$ 164,385,648	$ 212,725,330
Commodity Futures Contracts, Value	[1]	(22,080,390)	(57,894,130)
Commodity Futures Contracts, Unrealized Appreciation (Depreciation)	[1]	$ (22,080,390)	$ (57,894,130)
Futures [Member] | Long [Member] | CME SWAPS MARKETS (NYMEX) RBOB Gasoline [Member]
Schedule of Investments [Line Items]
Commodity Futures Contracts, Number of Contracts | Contract		2,689	3,799
Commodity Futures Contracts, Expiration Date		Dec. 31, 2019	Dec. 31, 2019
Commodity Futures Contracts, Notional Value		$ 170,513,792	$ 212,993,974
Commodity Futures Contracts, Value	[1]	2,286,742	(26,605,722)
Commodity Futures Contracts, Unrealized Appreciation (Depreciation)	[1]	$ 2,286,742	$ (26,605,722)
Futures [Member] | Long [Member] | CME SWAPS MARKETS (NYMEX) WTI Crude Oil [Member]
Schedule of Investments [Line Items]
Commodity Futures Contracts, Number of Contracts | Contract		3,008	4,437
Commodity Futures Contracts, Expiration Date		Feb. 29, 2020	Feb. 28, 2019
Commodity Futures Contracts, Notional Value		$ 159,123,200	$ 202,859,640
Commodity Futures Contracts, Value	[1]	(8,559,854)	(59,567,803)
Commodity Futures Contracts, Unrealized Appreciation (Depreciation)	[1]	$ (8,559,854)	$ (59,567,803)

[1] Unrealized Appreciation (Depreciation) and Value are presented above, net by contract.