Statement of Financial Condition - USD ($)		Dec. 31, 2017	Dec. 31, 2016
Assets
United States Treasury Obligations, at value (cost $1,839,147,058 and $2,403,904,566, respectively)		$ 1,839,039,728	$ 2,403,838,023
Affiliated investments, at value (cost $317,993,905 and $131,029,805, respectively)		317,746,227	131,029,805
Other investments:
Variation margin receivable- Commodity Futures Contracts		10,995,195	454,471
LME Commodity Futures Contracts receivable		2,768,350	2,261,914
Unrealized appreciation on LME Commodity Futures Contracts		27,478,010
Net unrealized appreciation (depreciation) on Commodity Futures Contracts			16,601,502
Cash held by custodian	[1]	5,939,564	5,015,157
Receivable for:
Dividends from affiliates		93,516	42,071
Fund shares sold		59,885,426
Total assets		2,263,946,016	2,559,242,943
Payable for:
Management fees		1,584,044	1,773,390
Brokerage commissions and fees		2,779	5,014
Total liabilities		1,586,823	1,778,404
Commitments and Contingencies (Note 10)
Equity
Shareholder's equity—General Shares		665	633
Shareholders' equity—Shares		2,262,358,528	2,557,463,906
Total shareholders' equity		2,262,359,193	2,557,464,539
Total liabilities and equity		$ 2,263,946,016	$ 2,559,242,943
General Shares outstanding		40	40
Shares outstanding		136,000,000	161,600,000
Net asset value per share		$ 16.63	$ 15.83
Market value per share		$ 16.62	$ 15.84

[1] Cash at December 31, 2017, 2016 and 2015 reflects cash held by the Custodian.