Additional Valuation Information - Summary of the Tiered Valuation Input Levels (Detail) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
United States Treasury Obligations	$ 1,041,943,669	$ 399,870,102
Exchange-Traded Fund	192,924,594	180,949,308
Money Market Mutual Fund	1,206,232,685	710,155,447
Total Investments in Securities	2,441,100,948	1,290,974,857
Commodity Futures Contracts, Appreciation	392,725,319	148,843,441
Commodity Futures Contracts, Depreciation	(15,936,350)
Commodity Futures Contracts	376,788,969
Total Investments	2,817,889,917	1,439,818,298
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Exchange-Traded Fund	192,924,594	180,949,308
Money Market Mutual Fund	1,206,232,685	710,155,447
Total Investments in Securities	1,399,157,279	891,104,755
Commodity Futures Contracts, Appreciation	392,725,319	148,843,441
Commodity Futures Contracts, Depreciation	(15,936,350)
Commodity Futures Contracts	376,788,969
Total Investments	1,775,946,248	1,039,948,196
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
United States Treasury Obligations	1,041,943,669	399,870,102
Total Investments in Securities	1,041,943,669	399,870,102
Total Investments	$ 1,041,943,669	$ 399,870,102