Invesco DB Base Metals Fund (DBB) 10-Q 8 May 18 2018 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information	3 Months Ended
	Mar. 31, 2018shares
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
Trading Symbol	DBB
Entity Registrant Name	POWERSHARES DB BASE METALS FUND
Entity Central Index Key	1,383,084
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding	19,200,000

Statements of Financial Conditi

Statements of Financial Condition (Unaudited) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Assets
United States Treasury Obligations, at value (cost $324,938,476 and $244,424,302, respectively)	$ 324,867,337	$ 244,408,079
Affiliated Investments, at value (cost $34,625,616 and $39,110,095, respectively)	34,672,037	39,094,237
Other investments:
LME Commodity Futures Contracts receivable	233,762
Unrealized appreciation on LME Commodity Futures Contracts	4,359,619	31,489,170
Receivable for:
Dividends from affiliates	21,544	17,523
Total assets	364,154,299	315,009,009
Other investments:
LME Commodity Futures Contracts payable		731,031
Payable for:
Management fees	226,632	182,156
Brokerage commissions and fees	25,353	4,561
Total liabilities	15,247,647	917,748
Commitments and Contingencies (Note 10)
Equity
Shareholder's equity—General Shares	727	776
Shareholders' equity—Shares	348,905,925	314,090,485
Total shareholders' equity	348,906,652	314,091,261
Total liabilities and equity	364,154,299	$ 315,009,009
Unrealized depreciation on LME Commodity Futures Contracts	$ 14,995,662
General Shares outstanding	40	40
Shares outstanding	19,200,000	16,200,000
Net asset value per share	$ 18.17	$ 19.39
Market value per share	$ 18.20	$ 19.43

Statements of Financial Condit3

Statements of Financial Condition (Unaudited) (Parenthetical) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Investments in Securities, cost	$ 359,564,092	$ 283,534,397
US Treasury Bill Securities [Member]
Investments in Securities, cost	324,938,476	244,424,302
Affiliated Investments [Member]
Affiliated Investments, at Cost	$ 34,625,616	$ 39,110,095

Schedule of Investments (Unaudi

Schedule of Investments (Unaudited) - Treasury Bills and Money Market Fund - USD ($)		3 Months Ended		12 Months Ended
		Mar. 31, 2018		Dec. 31, 2017
Schedule Of Investments [Line Items]
Investments in Securities, cost		$ 359,564,092		$ 283,534,397
Percentage of Shareholders' Equity		103.05%		90.26%
Value		$ 324,867,337		$ 244,408,079
Affiliated investments, at value		34,672,037		39,094,237
Total Investments in Securities		359,539,374		283,502,316
Affiliated Investments [Member]
Schedule Of Investments [Line Items]
Affiliated Investments, at Cost		$ 34,625,616		$ 39,110,095
Percentage of Shareholders' Equity		9.94%		12.45%
Affiliated investments, at value		$ 34,672,037		$ 39,094,237
U.S. Treasury Bills, 1.695% due May 3, 2018 [Member]
Schedule Of Investments [Line Items]
Investment Interest Rate	[1]	1.695%
Investment Maturity Date	[1]	May 3, 2018
Percentage of Shareholders' Equity	[1]	29.77%
Value	[1]	$ 103,854,857
Principal Value	[1]	$ 104,000,000
U.S. Treasury Bills, 1.660% due June 7, 2018 [Member]
Schedule Of Investments [Line Items]
Investment Interest Rate	[1]	1.66%
Investment Maturity Date	[1]	Jun. 7, 2018
Percentage of Shareholders' Equity	[1]	33.43%
Value	[1]	$ 116,644,624
Principal Value	[1]	$ 117,000,000
U.S. Treasury Bills, 1.740% due July 5, 2018 [Member]
Schedule Of Investments [Line Items]
Investment Interest Rate	[1],[2]	1.74%
Investment Maturity Date	[1],[2]	Jul. 5, 2018
Restricted for maintenance margin	[1],[2]	$ 47,784,000
Percentage of Shareholders' Equity	[1],[2]	15.69%
Value	[1],[2]	$ 54,755,093
Principal Value	[1],[2]	$ 55,000,000
U.S. Treasury Bills, 1.830% due August 30, 2018 [Member]
Schedule Of Investments [Line Items]
Investment Interest Rate	[1]	1.83%
Investment Maturity Date	[1]	Aug. 30, 2018
Percentage of Shareholders' Equity	[1]	14.22%
Value	[1]	$ 49,612,763
Principal Value	[1]	50,000,000
United States Treasury Obligations [Member]
Schedule Of Investments [Line Items]
Investments in Securities, cost	[1]	$ 324,938,476		$ 244,424,302
Percentage of Shareholders' Equity	[1]	93.11%		77.81%
Value	[1]	$ 324,867,337		$ 244,408,079
Exchange-Traded Fund - PowerShares Treasury Collateral Portfolio [Member] | Affiliated Investments [Member]
Schedule Of Investments [Line Items]
Affiliated Investments, at Cost	[3]	$ 16,006,371		$ 16,006,371
Percentage of Shareholders' Equity		4.60%	[3]	5.09%
Affiliated investments, at value		$ 16,052,792	[3]	$ 15,990,513
Shares		151,900	[3]	151,900
Money Market Mutual Fund - Premier U.S. Government Money Portfolio - Institutional Class [Member] | Affiliated Investments [Member]
Schedule Of Investments [Line Items]
Investment Interest Rate		1.52%	[4]	1.15%	[5]
Affiliated Investments, at Cost		$ 18,619,245	[4]	$ 23,103,724	[5]
Percentage of Shareholders' Equity		5.34%	[4]	7.36%
Affiliated investments, at value		$ 18,619,245	[4]	$ 23,103,724
Shares		18,619,245	[4]	23,103,724
U.S. Treasury Bills, 1.180% due January 4, 2018 [Member]
Schedule Of Investments [Line Items]
Investment Interest Rate	[1]			1.18%
Investment Maturity Date	[1]			Jan. 4, 2018
Percentage of Shareholders' Equity	[1]			14.01%
Value	[1]			$ 43,997,241
Principal Value	[1]			$ 44,000,000
U.S. Treasury Bills, 1.245% due January 18, 2018 [Member]
Schedule Of Investments [Line Items]
Investment Interest Rate	[1]			1.245%
Investment Maturity Date	[1]			Jan. 18, 2018
Percentage of Shareholders' Equity	[1]			14.95%
Value	[1]			$ 46,974,228
Principal Value	[1]			$ 47,000,000
U.S. Treasury Bills, 1.285% due February 22, 2018 [Member]
Schedule Of Investments [Line Items]
Investment Interest Rate	[1]			1.285%
Investment Maturity Date	[1]			Feb. 22, 2018
Percentage of Shareholders' Equity	[1]			16.21%
Value	[1]			$ 50,908,965
Principal Value	[1]			$ 51,000,000
U.S. Treasury Bills, 1.285% due March 1, 2018 [Member]
Schedule Of Investments [Line Items]
Investment Interest Rate	[1],[6]			1.285%
Investment Maturity Date	[1],[6]			Mar. 1, 2018
Restricted for maintenance margin	[1],[6]			$ 12,972,700
Percentage of Shareholders' Equity	[1],[6]			13.34%
Value	[1],[6]			$ 41,914,233
Principal Value	[1],[6]			$ 42,000,000
U.S. Treasury Bills, 1.450% due June 7, 2018 [Member]
Schedule Of Investments [Line Items]
Investment Interest Rate	[1]			1.45%
Investment Maturity Date	[1]			Jun. 7, 2018
Percentage of Shareholders' Equity	[1]			19.30%
Value	[1]			$ 60,613,412
Principal Value	[1]			$ 61,000,000
[1]	Security may be traded on a discount basis. The interest rate shown represents the discount rate at the most recent auction date of the security prior to period end.
[2]	United States Treasury Obligations of $47,784,000 are on deposit with the Commodity Broker and held as maintenance margin for open futures contracts.
[3]	Affiliated company. The security and the Fund are affiliated by having the same investment adviser. See Note 8.
[4]	The security and the Fund are advised by wholly-owned subsidiaries of Invesco Ltd. and are therefore considered to be affiliated. The rate shown is the 7-day SEC standardized yield as of March 31, 2018.
[5]	The security and the Fund are advised by wholly-owned subsidiaries of Invesco Ltd. and are therefore considered to be affiliated. The rate shown is the 7-day SEC standardized yield as of December 31, 2017.
[6]	United States Treasury Obligations of $12,972,700 are on deposit with the Commodity Broker and held as maintenance margin for open futures contracts.

Schedule of Investments (Unaud5

Schedule of Investments (Unaudited) - Futures Contracts		3 Months Ended	12 Months Ended
		Mar. 31, 2018USD ($)Contract	Dec. 31, 2017USD ($)Contract
Schedule Of Investments [Line Items]
Value		$ 359,539,374	$ 283,502,316
Total Commodity Futures Contracts Purchased [Member] | Long [Member]
Schedule Of Investments [Line Items]
Value	[1]	(10,636,043)	31,489,170
Unrealized Appreciation (Depreciation)	[1]	$ (10,636,043)	$ 31,489,170
Total Commodity Futures Contracts Purchased [Member] | LME CLEAR [Member] | Long [Member] | Aluminum [Member]
Schedule Of Investments [Line Items]
Number of Contracts | Contract		2,205	1,860
Expiration Date		Oct. 31, 2018	Oct. 31, 2018
Notional Value		$ 111,311,156	$ 106,903,500
Value	[1]	(7,910,024)	6,848,032
Unrealized Appreciation (Depreciation)	[1]	$ (7,910,024)	$ 6,848,032
Total Commodity Futures Contracts Purchased [Member] | LME CLEAR [Member] | Long [Member] | Copper [Member]
Schedule Of Investments [Line Items]
Number of Contracts | Contract		681	583
Expiration Date		Feb. 28, 2019	Feb. 28, 2018
Notional Value		$ 115,650,825	$ 105,442,838
Value	[1]	(7,085,638)	20,057,969
Unrealized Appreciation (Depreciation)	[1]	$ (7,085,638)	$ 20,057,969
Total Commodity Futures Contracts Purchased [Member] | LME CLEAR [Member] | Long [Member] | Zinc [Member]
Schedule Of Investments [Line Items]
Number of Contracts | Contract		1,500	1,265
Expiration Date		Jan. 31, 2019	Jan. 31, 2019
Notional Value		$ 121,631,250	$ 101,832,500
Value	[1]	4,359,619	4,583,169
Unrealized Appreciation (Depreciation)	[1]	$ 4,359,619	$ 4,583,169
[1]	Unrealized Appreciation (Depreciation) and Value are presented above, net by contract.

Statements of Income and Expens

Statements of Income and Expenses (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income
Interest Income	$ 1,043,018	$ 316,094
Dividends from Affiliates	60,139	15,355
Total Income	1,103,157	331,449
Expenses
Management Fees	635,348	545,314
Brokerage Commissions and Fees	33,345	19,290
Total Expenses	668,693	564,604
Less: Waivers	(12,268)	(8,304)
Net Expenses	656,425	556,300
Net Investment Income (Loss)	446,732	(224,851)
Net Realized Gain (Loss) on
United States Treasury Obligations		(249)
Commodity Futures Contracts	18,607,089	14,811,425
Net Realized Gain (Loss)	18,607,089	14,811,176
Net Change in Unrealized Gain (Loss) on
United States Treasury Obligations	(54,916)	(21,904)
Affiliated Investments	62,279	5,408
Commodity Futures Contracts	(42,125,213)	12,089,169
Net Change in Unrealized Gain (Loss)	(42,117,850)	12,072,673
Net Realized and Net Change in Unrealized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts	(23,510,761)	26,883,849
Net Income (Loss)	$ (23,064,029)	$ 26,658,998

Statement of Changes in Shareho

Statement of Changes in Shareholders' Equity (Unaudited) - USD ($)	Total	General Shares [Member]	Shares [Member]
Balance - Value at Dec. 31, 2016	$ 284,135,889	$ 598	$ 284,135,291
Balance - Shares at Dec. 31, 2016		40	19,000,000
Purchases of Shares - Value	9,433,086		$ 9,433,086
Purchases of Shares - Shares			600,000
Redemption of Shares - Value	(38,466,813)		$ (38,466,813)
Redemption of Shares - Shares			(2,400,000)
Net Increase (Decrease) due to Share Transactions, value	(29,033,727)		$ (29,033,727)
Net Increase (Decrease) due to Share Transactions, shares			(1,800,000)
Net Income (Loss)
Net Investment Income (Loss)	(224,851)	$ (1)	$ (224,850)
Net Realized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts	14,811,176	32	14,811,144
Net Change in Unrealized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts	12,072,673	26	12,072,647
Net Income (Loss)	26,658,998	57	26,658,941
Net Change in Shareholders' Equity, value	(2,374,729)	57	$ (2,374,786)
Net Change in Shareholders' Equity, shares			(1,800,000)
Balance - Value at Mar. 31, 2017	281,761,160	$ 655	$ 281,760,505
Balance - Shares at Mar. 31, 2017		40	17,200,000
Balance - Value at Dec. 31, 2017	314,091,261	$ 776	$ 314,090,485
Balance - Shares at Dec. 31, 2017		40	16,200,000
Purchases of Shares - Value	65,629,531		$ 65,629,531
Purchases of Shares - Shares			3,400,000
Redemption of Shares - Value	(7,750,111)		$ (7,750,111)
Redemption of Shares - Shares			(400,000)
Net Increase (Decrease) due to Share Transactions, value	57,879,420		$ 57,879,420
Net Increase (Decrease) due to Share Transactions, shares			3,000,000
Net Income (Loss)
Net Investment Income (Loss)	446,732	$ 1	$ 446,731
Net Realized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts	18,607,089	39	18,607,050
Net Change in Unrealized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts	(42,117,850)	(89)	(42,117,761)
Net Income (Loss)	(23,064,029)	(49)	(23,063,980)
Net Change in Shareholders' Equity, value	34,815,391	(49)	$ 34,815,440
Net Change in Shareholders' Equity, shares			3,000,000
Balance - Value at Mar. 31, 2018	$ 348,906,652	$ 727	$ 348,905,925
Balance - Shares at Mar. 31, 2018		40	19,200,000

Statements of Cash Flows (Unaud

Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net Income (Loss)	$ (23,064,029)	$ 26,658,998
Adjustments to reconcile net income (loss) to net cash provided by (used for) operating activities:
Cost of securities purchased	(273,471,407)	(98,864,430)
Proceeds from securities sold and matured	194,000,000	117,998,538
Cost of affiliated investments purchased	(88,156,176)	(78,257,089)
Proceeds from affiliated investments sold	92,640,655	77,049,713
Net accretion of discount on United States Treasury Obligations	(1,042,767)	(315,640)
Net realized (gain) loss on United States Treasury Obligations and Affiliated Investments		249
Net change in unrealized (gain) loss on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts	42,117,850	(12,072,673)
Change in operating assets and liabilities:
Dividends from affiliates	(4,021)	467
LME Commodity Futures Contracts	(964,793)	(3,167,473)
Management fees	44,476	3,059
Brokerage commissions and fees	20,792	8
Net cash provided by (used for) operating activities	(57,879,420)	29,033,727
Cash flows from financing activities:
Proceeds from purchases of Shares	65,629,531	9,433,086
Redemption of Shares	(7,750,111)	(38,466,813)
Net cash provided by (used for) financing activities	57,879,420	(29,033,727)
Net change in cash	0	0
Cash at beginning of period	0	0
Cash at end of period	$ 0	$ 0

Organization

Organization	3 Months Ended
	Mar. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Organization	Note 1 - Organization PowerShares DB Base Metals Fund (the “Fund”), a separate series of PowerShares DB Multi-Sector Commodity Trust (the “Trust”), a Delaware statutory trust organized in seven separate series was formed on August 3, 2006. The term of the Fund is perpetual (unless terminated earlier in certain circumstances) as provided for in the Fifth Amended and Restated Declaration of Trust and Trust Agreement of the Trust, as amended (the “Trust Agreement”). The Fund has an unlimited number of shares authorized for issuance. Invesco PowerShares Capital Management LLC (“Invesco”) has served as the managing owner (the “Managing Owner”), commodity pool operator and commodity trading advisor of the Trust and the Fund since February 23, 2015. The Managing Owner holds 40 general shares (the “General Shares”) of the Fund. The fiscal year end of the Fund is December 31st. The Fund seeks to track changes, whether positive or negative, in the level of the DBIQ Optimum Yield Industrial Metals Index Excess Return™ (the “Index”) over time, plus the excess, if any, of the sum of the Fund’s interest income from its holdings of United States Treasury Obligations (“Treasury Income”), dividends from its holdings in money market mutual funds (affiliated or otherwise) (“Money Market Income”) and dividends or distributions of capital gains from its holdings of T-Bill ETFs (as defined below) (“T-Bill ETF Income”) over the expenses of the Fund. The Fund invests in futures contracts in an attempt to track its Index. The Index is intended to reflect the change in market value of the base metals sector. The commodities comprising the Index are aluminum, zinc and copper—Grade A (each an “Index Commodity”, and collectively, the “Index Commodities”). The Fund may invest directly in United States Treasury Obligations. The Fund may also gain exposure to United States Treasury Obligations through investments in exchange-traded funds (“ETFs”) (affiliated or otherwise) that track indexes that measure the performance of United States Treasury Obligations with a maximum remaining maturity of up to 12 months (“T-Bill ETFs”). The Fund invests in United States Treasury Obligations, money market mutual funds and T-Bill ETFs (affiliated or otherwise), if any, for margin and/or cash management purposes. The Commodity Futures Trading Commission (the “CFTC”) and certain futures exchanges impose position limits on futures contracts that reference Index Commodities (the “Index Contracts”). As the Fund approaches or reaches position limits with respect to an Index Commodity, the Fund may commence investing in Index Contracts that reference other Index Commodities. In those circumstances, the Fund may also trade in futures contracts based on commodities other than Index Commodities that the Managing Owner reasonably believes tend to exhibit trading prices that correlate with an Index Contract. In addition, the Managing Owner may determine to invest in other futures contracts if at any time it is impractical or inefficient to gain full or partial exposure to an Index Commodity through the use of Index Contracts. These other futures contracts may or may not be based on an Index Commodity. When they are not, the Managing Owner may seek to select futures contracts that it reasonably believes tend to exhibit trading prices that correlate with an Index Contract. The Fund offers common units of beneficial interest (the “Shares”) only to certain eligible financial institutions (the “Authorized Participants”) in one or more blocks of 200,000 Shares, called a Basket. The Fund commenced investment operations on January 3, 2007. The Fund commenced trading on the American Stock Exchange (which became the NYSE Alternext US LLC) on January 5, 2007 and, since November 25, 2008, has been listed on the NYSE Arca, Inc. (the “NYSE Arca”). This Quarterly Report (the “Report”) covers the three months ended March 31, 2018 and 2017. The accompanying unaudited financial statements were prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information and with the instructions for Form 10-Q and the rules and regulations of the U.S. Securities and Exchange Commission (the “SEC”). In the opinion of management, all material adjustments, consisting only of normal recurring adjustments, considered necessary for a fair statement of the interim period financial statements have been made. Interim period results are not necessarily indicative of results for a full-year period. These financial statements and the notes thereto should be read in conjunction with the Fund’s financial statements included in its Annual Report on Form 10-K for the year ended December 31, 2017 as filed with the SEC on February 28, 2018.

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Note 2 - Summary of Significant Accounting Policies A. The financial statements of the Fund have been prepared using U.S. GAAP. The Fund has determined that it meets the definition of an investment company and has prepared the financial statements in conformity with U.S. GAAP for investment companies in conformity with accounting and reporting guidance of the Financial Accounting Standards Board Accounting Standards Codification Topic 946, Financial Services Investment Companies B. Accounting Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates by a significant amount. In addition, the Fund monitors for material events or transactions that may occur or become known after the period-end date and before the date the financial statements are released to print. C. Investment Valuations Investments in open-end and closed-end registered investment companies that do not trade on an exchange are valued at the end-of-day net asset value (“NAV”) per share. Investments in open-end and closed-end registered investment companies that trade on an exchange are valued at the last sales price or official closing price as of the close of the customary trading session on the exchange where the security is principally traded. United States Treasury Obligations are fair valued using an evaluated quote provided by an independent pricing service. Evaluated quotes provided by the pricing service may be determined without exclusive reliance on quoted prices, and may reflect appropriate factors such as developments related to specific securities, yield, quality, type of issue, coupon rate, maturity, individual trading characteristics and other market data. All debt obligations involve some risk of default with respect to interest and/or principal payments. Futures contracts are valued at the final settlement price set by an exchange on which they are principally traded. When market closing prices are not available, the Managing Owner may value an asset of the Fund pursuant to policies the Managing Owner has adopted, which are consistent with normal industry standards. D. Investment Transactions and Investment Income Investment transactions are accounted for on a trade date basis. Realized gains or losses from the sale or disposition of securities or derivatives are determined on a specific identification basis and recognized in the Statements of Income and Expenses in the period in which the contract is closed or the sale or disposition occurs, respectively. Interest income on United States Treasury Obligations is recognized on an accrual basis when earned. Premiums and discounts are amortized or accreted over the life of the United States Treasury Obligations. Dividend income (net of withholding tax, if any) is recorded on the ex-dividend date. E. Profit and Loss Allocations and Distributions Pursuant to the Trust Agreement, income and expenses are allocated pro rata pro rata No distributions were paid for the three months ended March 31, 2018 and 2017. F. Routine Operational, Administrative and Other Ordinary Expenses The Managing Owner is responsible for all routine operational, administrative and other ordinary expenses of the Fund, including, but not limited to, computer services, the fees and expenses of the Trustee, legal and accounting fees and expenses, tax preparation expenses, filing fees and printing, mailing and duplication costs. The Fund does not reimburse the Managing Owner for the routine operational, administrative and other ordinary expenses of the Fund. Accordingly, such expenses are not reflected in the Statements of Income and Expenses of the Fund. G. Non-Recurring Fees and Expenses The Fund pays all non-recurring and unusual fees and expenses, if any, of itself, as determined by the Managing Owner. Non-recurring and unusual fees and expenses include fees and expenses, such as legal claims and liabilities, litigation costs, indemnification expenses or other non-routine expenses. Non-recurring and unusual fees and expenses, by their nature, are unpredictable in terms of timing and amount. For the three months ended March 31, 2018 and 2017, the Fund did not incur such expenses. H. Brokerage Commissions and Fees The Fund incurs all brokerage commissions, including applicable exchange fees, National Futures Association (“NFA”) fees, give-up fees, pit brokerage fees and other transaction related fees and expenses charged in connection with trading activities by the Commodity Broker (as defined below). These costs are recorded as Brokerage Commissions and Fees in the Statements of Income and Expenses. The Commodity Broker’s brokerage commissions and trading fees are determined on a contract-by-contract basis. On average, total charges paid to the Commodity Broker, as applicable were less than $13.00 and $19.00 per round-turn trade during the three months ended March 31, 2018 and 2017, respectively. I. Income Taxes The Fund is classified as a partnership for U.S. federal income tax purposes. Accordingly, the Fund will generally not incur U.S. federal income taxes. No provision for federal, state, and local income taxes has been made in the accompanying financial statements, as investors are individually liable for income taxes, if any, on their allocable share of the Fund’s income, gain, loss, deductions and other items. The Managing Owner has reviewed all of the Fund’s open tax years and major jurisdictions and concluded that there is no tax liability resulting from unrecognized tax benefits relating to uncertain tax positions taken or expected to be taken in future tax returns. The Fund is also not aware of any tax positions for which it is reasonably possible that the total amounts of unrecognized tax benefits will significantly change in the next twelve months. The major tax jurisdiction for the Fund and the earliest tax year subject to examination: United States, 2014. J. Commodity Futures Contracts The Fund utilizes derivative instruments to achieve its investment objective. A commodity futures contract is an agreement between counterparties to purchase or sell a specified underlying commodity for a specified price, or to pay or receive a cash amount based on the value of an index or other reference instrument, at a future date. Initial margin deposits required upon entering into futures contracts are satisfied by the segregation of specific securities or cash as collateral with the Commodity Broker. During the period that the commodity futures contracts are open, changes in the value of the contracts are recognized as unrealized gains or losses by recalculating the value of the contracts on a daily basis. Subsequent or variation margin payments are received or made on non-LME commodity futures contracts depending upon whether unrealized gains or losses are incurred. These amounts are reflected as a receivable or payable on the Statements of Financial Condition. For LME contracts, subsequent or variation margin payments are not made and the value of the contracts is presented as net unrealized appreciation (depreciation) on the Statements of Financial Condition. When LME or non-LME contracts are closed or expire, the Fund recognizes a realized gain or loss equal to the difference between the proceeds from, or cost of, the closing transaction and the Fund’s basis in the contract. Realized gains (losses) and changes in unrealized appreciation (depreciation) on open positions are determined on a specific identification basis and recognized in the Statements of Income and Expenses in the period in which the contract is closed or the changes occur, respectively. K. Receivable/(Payable) for LME Contracts The Fund trades aluminum, copper and zinc commodity futures contracts on the LME. For settlement of futures contracts traded on the LME, cash is not transferred until the settled futures contracts expire. As of March 31, 2018, the Fund had a receivable from the Commodity Broker of $233,762, related to net realized gains on LME contracts, which have been closed out but for which the contract was not yet expired. As of December 31, 2017, the Fund had a payable to the Commodity Broker of $731,031, related to net realized losses on LME contracts which have been closed out but for which the contract was not yet expired.

Financial Instrument Risk

Financial Instrument Risk	3 Months Ended
	Mar. 31, 2018
Investments Debt And Equity Securities [Abstract]
Financial Instrument Risk	Note 3 - Financial Instrument Risk In the normal course of its business, the Fund is a party to financial instruments with off-balance sheet risk. The term “off-balance sheet risk” refers to an unrecorded potential liability that, even though it does not appear on the balance sheet, may result in a future obligation or loss in excess of the amounts shown on the Statements of Financial Condition. The financial instruments used by the Fund are commodity futures contracts, whose values are based upon an underlying asset and generally represent future commitments that have a reasonable possibility of being settled in cash or through physical delivery. The financial instruments are traded on an exchange and are standardized contracts. Market risk is the potential for changes in the value of the financial instruments traded by the Fund due to market changes, including fluctuations in commodity prices. In entering into these futures contracts, there exists a market risk that such futures contracts may be significantly influenced by adverse market conditions, resulting in such futures contracts being less valuable. If the markets should move against all of the futures contracts at the same time, the Fund could experience substantial losses. Credit risk is the possibility that a loss may occur due to the failure of the Commodity Broker and/or clearing house to perform according to the terms of a futures contract. Credit risk with respect to exchange-traded instruments is reduced to the extent that an exchange or clearing organization acts as a counterparty to the transactions. The Commodity Broker, when acting as the Fund’s futures commission merchant in accepting orders for the purchase or sale of domestic futures contracts, is required by CFTC regulations to separately account for and segregate as belonging to the Fund all assets of the Fund relating to domestic futures trading and the Commodity Broker is not allowed to commingle such assets with other assets of the Commodity Broker. In addition, CFTC regulations also require the Commodity Broker to hold in a secure account assets of the Fund related to foreign futures trading. The Fund’s risk of loss in the event of counterparty default is typically limited to the amounts recognized in the Statements of Financial Condition and not represented by the futures contract or notional amounts of the instruments. The Fund has not utilized, nor does it expect to utilize in the future, special purpose entities to facilitate off-balance sheet financing arrangements and has no loan guarantee arrangements or off-balance sheet arrangements of any kind, other than agreements entered into in the normal course of business noted above.

Service Providers and Related P

Service Providers and Related Party Agreements	3 Months Ended
	Mar. 31, 2018
Related Party Transactions [Abstract]
Service Providers and Related Party Agreements	Note 4 – Service Providers and Related Party Agreements The Trustee Under the Trust Agreement, Wilmington Trust Company, the trustee of the Trust and the Fund (the “Trustee”), has the power and authority to execute and file certificates as required by the Delaware Statutory Trust Act and to accept service of process on the Fund in the State of Delaware. The Managing Owner has the exclusive management and control of all aspects of the business of the Trust and the Fund. The Trustee will serve in that capacity until such time as the Managing Owner removes the Trustee or the Trustee resigns and a successor is appointed by the Managing Owner. The Trustee will have no duty or liability to supervise or monitor the performance of the Managing Owner, nor will the Trustee have any liability for the acts or omissions of the Managing Owner. The Managing Owner The Managing Owner serves as the Fund’s commodity pool operator, commodity trading advisor and managing owner. The Fund pays the Managing Owner a management fee, monthly in arrears, in an amount equal to 0.75% per annum of the daily NAV of the Fund (the “Management Fee”). The Fund, for cash management purposes, invests in money market mutual funds and/or T-Bill ETFs that are managed by affiliates of the Managing Owner. The indirect portion of the management fee that the Fund incurs through such investments is in addition to the Management Fee paid to the Managing Owner. The Managing Owner has contractually agreed to waive the fees that it receives in an amount equal to the indirect management fees that the Fund incurs through its investments in affiliated money market mutual funds and/or affiliated T-Bill ETFs indefinitely. The Managing Owner waived fees of $12,268 and $8,304 for the three months ended March 31, 2018 and 2017, respectively. The Distributor Invesco Distributors, Inc. (the “Distributor”) provides certain distribution services to the Fund. Pursuant to the Distribution Services Agreement among the Managing Owner, the Fund and the Distributor, the Distributor assists the Managing Owner and the Fund’s administrator, The Bank of New York Mellon with certain functions and duties relating to distribution and marketing services to the Fund including reviewing and approving marketing materials. The Managing Owner pays the Distributor a distribution fee out of the Management Fee. The Commodity Broker Morgan Stanley & Co. LLC, a Delaware limited liability company, serves as the Fund’s futures clearing broker (the “Commodity Broker”). The Commodity Broker is registered with the CFTC as a futures commission merchant and is a member of the NFA in such capacity. A variety of executing brokers execute futures transactions on behalf of the Fund. Such executing brokers give-up all such transactions to the Commodity Broker. In its capacity as clearing broker, the Commodity Broker may execute or receive transactions executed by others and clears all of the Fund’s futures transactions and performs certain administrative and custodial services for the Fund. The Commodity Broker is responsible, among other things, for providing periodic accountings of all dealings and actions taken by the Fund during the reporting period, together with an accounting of all securities, cash or other indebtedness or obligations held by it or its nominees for or on behalf of the Fund. The Administrator, Custodian and Transfer Agent The Bank of New York Mellon (the “Administrator” and “Custodian”) is the administrator, custodian and transfer agent of the Fund. The Fund and the Administrator have entered into separate administrative, custodian, transfer agency and service agreements (collectively referred to as the “Administration Agreement”). Pursuant to the Administration Agreement, the Administrator performs or supervises the performance of services necessary for the operation and administration of the Fund (other than making investment decisions), including receiving and processing orders from Authorized Participants to create and redeem Baskets, NAV calculations, accounting and other fund administrative services. The Administrator maintains certain financial books and records, including: Basket creation and redemption books and records, fund accounting records, ledgers with respect to assets, liabilities, capital, income and expenses, the registrar, transfer journals and related details, and trading and related documents received from the Commodity Broker. The Managing Owner pays the Administrator fees for its services out of the Management Fee. Index Sponsor The Managing Owner, on behalf of the Fund, has appointed Deutsche Bank Securities Inc. to serve as the index sponsor (the “Index Sponsor”). The Index Sponsor calculates and publishes the daily index levels and the indicative intraday index levels. Additionally, the Index Sponsor also calculates the indicative value per Share of the Fund throughout each business day. The Managing Owner pays the Index Sponsor a licensing fee and an index services fee out of the Management Fee for performing its duties.

Deposits with Commodity Broker

Deposits with Commodity Broker and Custodian	3 Months Ended
	Mar. 31, 2018
Brokers And Dealers [Abstract]
Deposits with Commodity Broker and Custodian	Note 5 - Deposits with Commodity Broker and Custodian The Fund defines cash as cash held by the Custodian. There were no cash equivalents held by the Fund as of March 31, 2018 and December 31, 2017. The Fund deposits cash and United States Treasury Obligations with the Commodity Broker, subject to CFTC regulations and various exchange and broker requirements. The combination of the Fund’s deposits with its Commodity Broker of cash and United States Treasury Obligations and the unrealized profit or loss on open futures contracts represents the Fund’s overall equity in its broker trading account. To meet the Fund’s maintenance margin requirements, the Fund holds United States Treasury Obligations with the Commodity Broker. The Fund transfers cash to the Commodity Broker to satisfy variation margin requirements. The Fund earns interest on any excess cash deposited with the Commodity Broker and incurs interest expense on any deficit balance with the Commodity Broker. The Fund may deposit T-Bill ETFs and money market mutual funds with the Commodity Broker as margin, to the extent permissible under CFTC rules. The brokerage agreement with the Commodity Broker provides for the net settlement of all financial instruments covered by the agreement in the event of default or termination of any one contract. The Managing Owner will utilize any excess cash held at the Commodity Broker to offset any realized losses incurred in the commodity futures contracts, if available. To the extent that any excess cash held at the Commodity Broker is not adequate to cover any realized losses, a portion of the United States Treasury Obligations and T-Bill ETFs, if any, on deposit with the Commodity Broker will be sold to make additional cash available. For financial reporting purposes, the Fund offsets financial assets and financial liabilities that are subject to legally enforceable netting arrangements. The Fund’s remaining cash, United States Treasury Obligations, T-Bill ETFs and money market mutual fund holdings are on deposit with the Custodian. The Fund is permitted to temporarily carry a negative or overdrawn balance in its account with the Custodian. Such balances, if any at period-end, are shown on the Statements of Financial Condition under the payable caption Due to custodian

Additional Valuation Informatio

Additional Valuation Information	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Additional Valuation Information	Note 6 - Additional Valuation Information U.S. GAAP defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date, under current market conditions. U.S. GAAP establishes a hierarchy that prioritizes the inputs to valuation methods, giving the highest priority to readily available unadjusted quoted prices in an active market for identical assets (Level 1) and the lowest priority to significant unobservable inputs (Level 3), generally when market prices are not readily available or are unreliable. Based on the valuation inputs, the securities or other investments are tiered into one of three levels. Changes in valuation methods or market conditions may result in transfers in or out of an investment’s assigned level: Level 1: Prices are determined using quoted prices in an active market for identical assets. Level 2: Prices are determined using other significant observable inputs. Observable inputs are inputs that other market participants may use in pricing a security. These may include quoted prices for similar securities, interest rates, prepayment speeds, credit risk, yield curves, loss severities, default rates, discount rates, volatilities and others. Level 3: Prices are determined using significant unobservable inputs. In situations where quoted prices or observable inputs are unavailable (for example, when there is little or no market activity for an investment at the end of the period), unobservable inputs may be used. Unobservable inputs reflect the Fund’s own assumptions about the factors market participants would use in determining fair value of the securities or instruments and would be based on the best available information. The levels assigned to the securities valuations may not be an indication of the risk or liquidity associated with investing in those securities. Because of the inherent uncertainties of valuation, the values reflected in the financial statements may materially differ from the value received upon actual sale of those investments. The Fund's policy is to recognize transfers in and out of the valuation levels as of the end of the reporting period. During the three months ended March 31, 2018 and the year ended December 31, 2017, there were no transfers between valuation levels. The following is a summary of the tiered valuation input levels as of March 31, 2018: Level 1 Level 2 Level 3 Total Investments in Securities United States Treasury Obligations $ — $ 324,867,337 $ — $ 324,867,337 Exchange-Traded Fund 16,052,792 — — 16,052,792 Money Market Mutual Fund 18,619,245 — — 18,619,245 Total Investments in Securities 34,672,037 324,867,337 — 359,539,374 Other Investments - Assets (a) Commodity Futures Contracts 4,359,619 — — 4,359,619 Other Investments - Liabilities (a) Commodity Futures Contracts (14,995,662 ) — — (14,995,662 ) Total Other Investments (10,636,043 ) — — (10,636,043 ) Total Investments $ 24,035,994 $ 324,867,337 $ — $ 348,903,331 (a) Unrealized appreciation (depreciation). The following is a summary of the tiered valuation input levels as of December 31, 2017: Level 1 Level 2 Level 3 Total Investments in Securities United States Treasury Obligations $ — $ 244,408,079 $ — $ 244,408,079 Exchange-Traded Fund 15,990,513 — — 15,990,513 Money Market Mutual Fund 23,103,724 — — 23,103,724 Total Investments in Securities 39,094,237 244,408,079 — 283,502,316 Other Investments - Assets (a) Commodity Futures Contracts 31,489,170 — — 31,489,170 Total Investments $ 70,583,407 $ 244,408,079 $ — $ 314,991,486 (a) Unrealized appreciation (depreciation).

Derivative Instruments

Derivative Instruments	3 Months Ended
	Mar. 31, 2018
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative Instruments	Note 7 – Derivative Instruments The Fair Value of Derivative Instruments is as follows: March 31, 2018 December 31, 2017 Risk Exposure/Derivative Type (a) Assets Liabilities Assets Liabilities Commodity risk Commodity Futures Contracts $ 4,359,619 $ (14,995,662 ) $ 31,489,170 $ — (a) Includes cumulative appreciation (depreciation) of commodity futures contracts. Only the current day’s variation margin receivable (payable) is reported in the March 31, 2018 and December 31, 2017 Statements of Financial Condition for non-LME commodity futures contracts. The following table presents derivative instruments that are either subject to an enforceable netting agreement or offset by collateral arrangements as of March 31, 2018, net by contract: Financial Derivative Assets Financial Derivative Liabilities Net value of Collateral (Received)/Pledged (a) Counterparty Futures Contracts Futures Contracts derivatives Non-Cash Cash Net amount Morgan Stanley & Co. LLC $ 4,359,619 $ (14,995,662 ) $ (10,636,043 ) $ 10,636,043 $ — $ — The following table presents derivative instruments that are either subject to an enforceable netting agreement or offset by collateral arrangements as of December 31, 2017, net by contract: Financial Derivative Assets Financial Derivative Liabilities Net value of Collateral (Received)/Pledged (a) Counterparty Futures Contracts Futures Contracts derivatives Non-Cash Cash Net amount Morgan Stanley & Co. LLC $ 31,489,170 $ — $ 31,489,170 $ — $ — $ 31,489,170 (a) As of March 31, 2018 and December 31, 2017, a portion of the Fund’s U.S. Treasury Obligations were required to be deposited as maintenance margin in support of the Fund’s futures positions. The Effect of Derivative Instruments on the Statements of Income and Expenses is as follows: For the Three Months Ended Location of Gain or (Loss) on Derivatives March 31, Risk Exposure/Derivative Type Recognized in Income 2018 2017 Commodity risk Commodity Futures Contracts Net Realized Gain (Loss) $ 18,607,089 $ 14,811,425 Net Change in Unrealized Gain (Loss) (42,125,213 ) 12,089,169 Total $ (23,518,124 ) $ 26,900,594 The table below summarizes the average monthly notional value of futures contracts outstanding during the period: For the Three Months Ended March 31, 2018 2017 Average Notional Value $ 341,271,142 $ 293,898,322

Investments in Affiliates

Investments in Affiliates	3 Months Ended
	Mar. 31, 2018
Investments In And Advances To Affiliates Schedule Of Investments [Abstract]
Investments in Affiliates	Note 8 -- Investments in Affiliates The Fund's investment adviser also serves as the adviser for PowerShares Treasury Collateral Portfolio, and therefore, PowerShares Treasury Collateral Portfolio is considered to be affiliated with the Fund. The following is a summary of the transactions in, and earnings from, investments in affiliates (excluding affiliated money market mutual funds) for the three months ended March 31, 2018. Value 12/31/2017 Purchases at Cost Proceeds from Sales Change in Unrealized Appreciation (Depreciation) Realized Gain (Loss) Value 03/31/2018 Dividend Income PowerShares Treasury Collateral Portfolio $ 15,990,513 $ — $ — $ 62,279 $ — $ 16,052,792 $ —

Share Purchases and Redemptions

Share Purchases and Redemptions	3 Months Ended
	Mar. 31, 2018
Text Block [Abstract]
Share Purchases and Redemptions	Note 9 - Share Purchases and Redemptions (a) Purchases On any business day, an Authorized Participant may place an order with the Administrator, which also serves as the Fund’s transfer agent (“Transfer Agent”) to create one or more Baskets. Each Basket consists of a block of 200,000 Shares. For purposes of processing both creation and redemption orders, a “business day” means any day other than a day when banks in New York City are required or permitted to be closed. Creation orders must be placed by 10:00 a.m., Eastern Time. The day on which the Transfer Agent receives a valid creation order is the creation order date. The day on which a creation order is settled is the creation order settlement date. Cash settlement occurs at the creation order settlement date. As provided below, the creation order settlement date may occur up to two business days after the creation order date. By placing a creation order, and prior to delivery of such Baskets, an Authorized Participant’s Depository Trust Company (“DTC”) account is charged the non-refundable transaction fee due for the creation order. Unless otherwise agreed to by the Managing Owner and the Authorized Participant as provided in the next sentence, Baskets are issued on the creation order settlement date as of 2:45 p.m., Eastern Time, on the business day immediately following the creation order date at the applicable NAV per Share as of the closing time of the NYSE Arca or the last to close of the exchanges on which its futures contracts are traded, whichever is later, on the creation order date, but only if the required payment has been timely received. Upon submission of a creation order, the Authorized Participant may request the Managing Owner to agree to a creation order settlement date up to two business days after the creation order date. (b) Redemptions On any business day, an Authorized Participant may place an order with the Transfer Agent to redeem one or more Baskets. Redemption orders must be placed by 10:00 a.m., Eastern Time. The day on which the Managing Owner receives a valid redemption order is the redemption order date. The day on which a redemption order is settled is the redemption order settlement date. Cash settlement occurs at the redemption order settlement date. As provided below, the redemption order settlement date may occur up to two business days after the redemption order date. The redemption procedures allow Authorized Participants to redeem Baskets. Individual Shareholders may not redeem directly from the Fund. Instead, individual Shareholders may only redeem Shares in integral multiples of 200,000 and only through an Authorized Participant. Unless otherwise agreed to by the Managing Owner and the Authorized Participant as provided in the next sentence, by placing a redemption order, an Authorized Participant agrees to deliver the Baskets to be redeemed through DTC’s book-entry system to the Fund not later than the redemption order settlement date as of 2:45 p.m., Eastern Time, on the business day immediately following the redemption order date. Upon submission of a redemption order, the Authorized Participant may request the Managing Owner to agree to a redemption order settlement date up to two business days after the redemption order date. By placing a redemption order, and prior to receipt of the redemption proceeds, an Authorized Participant’s DTC account is charged the non-refundable transaction fee due for the redemption order. The redemption proceeds from the Fund consist of the cash redemption amount. The cash redemption amount is equal to the NAV of the number of Basket(s) requested in the Authorized Participant’s redemption order as of the closing time of the NYSE Arca or the last to close of the exchanges on which the Fund’s futures contracts are traded, whichever is later, on the redemption order date. The Managing Owner will distribute the cash redemption amount at the redemption order settlement date as of 2:45 p.m., Eastern Time, on the redemption order settlement date through DTC to the account of the Authorized Participant as recorded on DTC’s book-entry system. The redemption proceeds due from the Fund are delivered to the Authorized Participant at 2:45 p.m., Eastern Time, on the redemption order settlement date if, by such time, the Fund’s DTC account has been credited with the Baskets to be redeemed. If the Fund’s DTC account has not been credited with all of the Baskets to be redeemed by such time, the redemption distribution is delivered to the extent of whole Baskets received. Any remainder of the redemption distribution is delivered on the next business day to the extent of remaining whole Baskets received if the Transfer Agent receives the fee applicable to the extension of the redemption distribution date which the Managing Owner may, from time-to-time, determine and the remaining Baskets to be redeemed are credited to the Fund’s DTC account by 2:45 p.m., Eastern Time, on such next business day. Any further outstanding amount of the redemption order will be cancelled. The Managing Owner is also authorized to deliver the redemption distribution notwithstanding that the Baskets to be redeemed are not credited to the Fund’s DTC account by 2:45 p.m., Eastern Time, on the redemption order settlement date if the Authorized Participant has collateralized its obligation to deliver the Baskets through DTC’s book-entry system on such terms as the Managing Owner may determine from time-to-time.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2018
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 10 - Commitments and Contingencies The Managing Owner, either in its own capacity or in its capacity as the Managing Owner and on behalf of the Fund, has entered into various service agreements that contain a variety of representations, or provide indemnification provisions related to certain risks service providers undertake in performing services for the Fund. The Trust Agreement provides for the Fund to indemnify the Managing Owner and any affiliate of the Managing Owner that provides services to the Fund to the maximum extent permitted by applicable law, subject to certain exceptions for disqualifying conduct by the Managing Owner or such an affiliate. The Fund's maximum exposure under these arrangements is unknown as this would involve future claims that may be made against the Fund that have not yet occurred. Accordingly, the Managing Owner expects the risk of loss to be remote.

Financial Highlights

Financial Highlights	3 Months Ended
	Mar. 31, 2018
Investment Company Financial Highlights [Abstract]
Financial Highlights	Note 11 - Financial Highlights The Fund is presenting the following NAV and financial highlights related to investment performance for a Share outstanding for the three months ended March 31, 2018 and 2017. An individual investor’s return and ratios may vary based on the timing of capital transactions. NAV per Share is the NAV of the Fund divided by the number of outstanding Shares at the date of each respective period presented. Three Months Ended March 31, 2018 2017 Net Asset Value Net asset value per Share, beginning of period $ 19.39 $ 14.95 Net realized and change in unrealized gain (loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts (1.24 ) 1.44 Net investment income (loss) (a) 0.02 (0.01 ) Net income (loss) (1.22 ) 1.43 Net asset value per Share, end of period $ 18.17 $ 16.38 Market value per Share, beginning of period (b) $ 19.43 $ 14.91 Market value per Share, end of period (b) $ 18.20 $ 16.39 Ratio to average Net Assets (c) Net investment income (loss) 0.53 % (0.31 )% Expenses, after waivers 0.77 % 0.77 % Expenses, prior to waivers 0.79 % 0.78 % Total Return, at net asset value (d) (6.29 )% 9.57 % Total Return, at market value (d) (6.33 )% 9.93 % (a) Based on average shares outstanding. (b) The mean between the last bid and ask prices. (c) Annualized. (d) Total Return, at NAV is calculated assuming an initial investment made at the NAV at the beginning of the period, reinvestment of all dividends and distributions at NAV during the period, and redemption of Shares on the last day of the period. Total Return, at NAV includes adjustments in accordance with U.S. GAAP and as such, the NAV for financial reporting purposes and the returns based upon those NAVs may differ from the NAVs and returns for shareholder transactions. Total Return, at market value is calculated assuming an initial investment made at the market value at the beginning of the period, reinvestment of all dividends and distributions at market value during the period, and redemption of Shares at the market value on the last day of the period. Not annualized for periods less than one year, if applicable.

Subsequent Event

Subsequent Event	3 Months Ended
	Mar. 31, 2018
Subsequent Events [Abstract]
Subsequent Event	Note 12 – Subsequent Event Effective on or about June 4, 2018, the name of the Fund’s Managing Owner, the name of the Trust and the name of the Fund will change and will be replaced as follows: Current Name of Managing Owner New Name of Managing Owner Invesco PowerShares Capital Management LLC Invesco Capital Management LLC Current Name of Trust New Name of Trust PowerShares DB Multi-Sector Commodity Trust Invesco DB Multi-Sector Commodity Trust Current Fund Name New Fund Name PowerShares DB Base Metals Fund Invesco DB Base Metals Fund The name changes will not result in any change to the Fund’s investment objective or strategy.

Summary of Significant Accoun21

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Basis of Presentation	A. The financial statements of the Fund have been prepared using U.S. GAAP. The Fund has determined that it meets the definition of an investment company and has prepared the financial statements in conformity with U.S. GAAP for investment companies in conformity with accounting and reporting guidance of the Financial Accounting Standards Board Accounting Standards Codification Topic 946, Financial Services Investment Companies
Accounting Estimates	B. Accounting Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates by a significant amount. In addition, the Fund monitors for material events or transactions that may occur or become known after the period-end date and before the date the financial statements are released to print.
Investment Valuations	C. Investment Valuations Investments in open-end and closed-end registered investment companies that do not trade on an exchange are valued at the end-of-day net asset value (“NAV”) per share. Investments in open-end and closed-end registered investment companies that trade on an exchange are valued at the last sales price or official closing price as of the close of the customary trading session on the exchange where the security is principally traded. United States Treasury Obligations are fair valued using an evaluated quote provided by an independent pricing service. Evaluated quotes provided by the pricing service may be determined without exclusive reliance on quoted prices, and may reflect appropriate factors such as developments related to specific securities, yield, quality, type of issue, coupon rate, maturity, individual trading characteristics and other market data. All debt obligations involve some risk of default with respect to interest and/or principal payments. Futures contracts are valued at the final settlement price set by an exchange on which they are principally traded. When market closing prices are not available, the Managing Owner may value an asset of the Fund pursuant to policies the Managing Owner has adopted, which are consistent with normal industry standards.
Investment Transactions and Investment Income	D. Investment Transactions and Investment Income Investment transactions are accounted for on a trade date basis. Realized gains or losses from the sale or disposition of securities or derivatives are determined on a specific identification basis and recognized in the Statements of Income and Expenses in the period in which the contract is closed or the sale or disposition occurs, respectively. Interest income on United States Treasury Obligations is recognized on an accrual basis when earned. Premiums and discounts are amortized or accreted over the life of the United States Treasury Obligations. Dividend income (net of withholding tax, if any) is recorded on the ex-dividend date.
Profit and Loss Allocations and Distributions	Pursuant to the Trust Agreement, income and expenses are allocated pro rata pro rata No distributions were paid for the three months ended March 31, 2018 and 2017.
Routine Operational, Administrative and Other Ordinary Expenses	F. Routine Operational, Administrative and Other Ordinary Expenses The Managing Owner is responsible for all routine operational, administrative and other ordinary expenses of the Fund, including, but not limited to, computer services, the fees and expenses of the Trustee, legal and accounting fees and expenses, tax preparation expenses, filing fees and printing, mailing and duplication costs. The Fund does not reimburse the Managing Owner for the routine operational, administrative and other ordinary expenses of the Fund. Accordingly, such expenses are not reflected in the Statements of Income and Expenses of the Fund.
Non-Recurring Fees and Expenses	G. Non-Recurring Fees and Expenses The Fund pays all non-recurring and unusual fees and expenses, if any, of itself, as determined by the Managing Owner. Non-recurring and unusual fees and expenses include fees and expenses, such as legal claims and liabilities, litigation costs, indemnification expenses or other non-routine expenses. Non-recurring and unusual fees and expenses, by their nature, are unpredictable in terms of timing and amount. For the three months ended March 31, 2018 and 2017, the Fund did not incur such expenses.
Brokerage Commissions and Fees	H. Brokerage Commissions and Fees The Fund incurs all brokerage commissions, including applicable exchange fees, National Futures Association (“NFA”) fees, give-up fees, pit brokerage fees and other transaction related fees and expenses charged in connection with trading activities by the Commodity Broker (as defined below). These costs are recorded as Brokerage Commissions and Fees in the Statements of Income and Expenses. The Commodity Broker’s brokerage commissions and trading fees are determined on a contract-by-contract basis. On average, total charges paid to the Commodity Broker, as applicable were less than $13.00 and $19.00 per round-turn trade during the three months ended March 31, 2018 and 2017, respectively.
Income Taxes	I. Income Taxes The Fund is classified as a partnership for U.S. federal income tax purposes. Accordingly, the Fund will generally not incur U.S. federal income taxes. No provision for federal, state, and local income taxes has been made in the accompanying financial statements, as investors are individually liable for income taxes, if any, on their allocable share of the Fund’s income, gain, loss, deductions and other items. The Managing Owner has reviewed all of the Fund’s open tax years and major jurisdictions and concluded that there is no tax liability resulting from unrecognized tax benefits relating to uncertain tax positions taken or expected to be taken in future tax returns. The Fund is also not aware of any tax positions for which it is reasonably possible that the total amounts of unrecognized tax benefits will significantly change in the next twelve months. The major tax jurisdiction for the Fund and the earliest tax year subject to examination: United States, 2014.
Commodity Futures Contracts	J. Commodity Futures Contracts The Fund utilizes derivative instruments to achieve its investment objective. A commodity futures contract is an agreement between counterparties to purchase or sell a specified underlying commodity for a specified price, or to pay or receive a cash amount based on the value of an index or other reference instrument, at a future date. Initial margin deposits required upon entering into futures contracts are satisfied by the segregation of specific securities or cash as collateral with the Commodity Broker. During the period that the commodity futures contracts are open, changes in the value of the contracts are recognized as unrealized gains or losses by recalculating the value of the contracts on a daily basis. Subsequent or variation margin payments are received or made on non-LME commodity futures contracts depending upon whether unrealized gains or losses are incurred. These amounts are reflected as a receivable or payable on the Statements of Financial Condition. For LME contracts, subsequent or variation margin payments are not made and the value of the contracts is presented as net unrealized appreciation (depreciation) on the Statements of Financial Condition. When LME or non-LME contracts are closed or expire, the Fund recognizes a realized gain or loss equal to the difference between the proceeds from, or cost of, the closing transaction and the Fund’s basis in the contract. Realized gains (losses) and changes in unrealized appreciation (depreciation) on open positions are determined on a specific identification basis and recognized in the Statements of Income and Expenses in the period in which the contract is closed or the changes occur, respectively.
Receivable/(Payable) for LME Contracts	K. Receivable/(Payable) for LME Contracts The Fund trades aluminum, copper and zinc commodity futures contracts on the LME. For settlement of futures contracts traded on the LME, cash is not transferred until the settled futures contracts expire. As of March 31, 2018, the Fund had a receivable from the Commodity Broker of $233,762, related to net realized gains on LME contracts, which have been closed out but for which the contract was not yet expired. As of December 31, 2017, the Fund had a payable to the Commodity Broker of $731,031, related to net realized losses on LME contracts which have been closed out but for which the contract was not yet expired.

Additional Valuation Informat22

Additional Valuation Information (Tables)	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Summary of the Tiered Valuation Input Levels	The following is a summary of the tiered valuation input levels as of March 31, 2018: Level 1 Level 2 Level 3 Total Investments in Securities United States Treasury Obligations $ — $ 324,867,337 $ — $ 324,867,337 Exchange-Traded Fund 16,052,792 — — 16,052,792 Money Market Mutual Fund 18,619,245 — — 18,619,245 Total Investments in Securities 34,672,037 324,867,337 — 359,539,374 Other Investments - Assets (a) Commodity Futures Contracts 4,359,619 — — 4,359,619 Other Investments - Liabilities (a) Commodity Futures Contracts (14,995,662 ) — — (14,995,662 ) Total Other Investments (10,636,043 ) — — (10,636,043 ) Total Investments $ 24,035,994 $ 324,867,337 $ — $ 348,903,331 (a) Unrealized appreciation (depreciation). The following is a summary of the tiered valuation input levels as of December 31, 2017: Level 1 Level 2 Level 3 Total Investments in Securities United States Treasury Obligations $ — $ 244,408,079 $ — $ 244,408,079 Exchange-Traded Fund 15,990,513 — — 15,990,513 Money Market Mutual Fund 23,103,724 — — 23,103,724 Total Investments in Securities 39,094,237 244,408,079 — 283,502,316 Other Investments - Assets (a) Commodity Futures Contracts 31,489,170 — — 31,489,170 Total Investments $ 70,583,407 $ 244,408,079 $ — $ 314,991,486 (a) Unrealized appreciation (depreciation).

Derivative Instruments (Tables)

Derivative Instruments (Tables)	3 Months Ended
	Mar. 31, 2018
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Fair Value of Derivative Instruments and Effect of Derivative Instruments on Statements of Income and Expenses	The Fair Value of Derivative Instruments is as follows: March 31, 2018 December 31, 2017 Risk Exposure/Derivative Type (a) Assets Liabilities Assets Liabilities Commodity risk Commodity Futures Contracts $ 4,359,619 $ (14,995,662 ) $ 31,489,170 $ — (a) Includes cumulative appreciation (depreciation) of commodity futures contracts. Only the current day’s variation margin receivable (payable) is reported in the March 31, 2018 and December 31, 2017 Statements of Financial Condition for non-LME commodity futures contracts. The Effect of Derivative Instruments on the Statements of Income and Expenses is as follows: For the Three Months Ended Location of Gain or (Loss) on Derivatives March 31, Risk Exposure/Derivative Type Recognized in Income 2018 2017 Commodity risk Commodity Futures Contracts Net Realized Gain (Loss) $ 18,607,089 $ 14,811,425 Net Change in Unrealized Gain (Loss) (42,125,213 ) 12,089,169 Total $ (23,518,124 ) $ 26,900,594
Summary of Gross and Net Amounts of Offsetting Assets and Liabilities	The following table presents derivative instruments that are either subject to an enforceable netting agreement or offset by collateral arrangements as of March 31, 2018, net by contract: Financial Derivative Assets Financial Derivative Liabilities Net value of Collateral (Received)/Pledged (a) Counterparty Futures Contracts Futures Contracts derivatives Non-Cash Cash Net amount Morgan Stanley & Co. LLC $ 4,359,619 $ (14,995,662 ) $ (10,636,043 ) $ 10,636,043 $ — $ — The following table presents derivative instruments that are either subject to an enforceable netting agreement or offset by collateral arrangements as of December 31, 2017, net by contract: Financial Derivative Assets Financial Derivative Liabilities Net value of Collateral (Received)/Pledged (a) Counterparty Futures Contracts Futures Contracts derivatives Non-Cash Cash Net amount Morgan Stanley & Co. LLC $ 31,489,170 $ — $ 31,489,170 $ — $ — $ 31,489,170 (a) As of March 31, 2018 and December 31, 2017, a portion of the Fund’s U.S. Treasury Obligations were required to be deposited as maintenance margin in support of the Fund’s futures positions.
Summary of Average Monthly Notional Value of Future Contracts Outstanding	The table below summarizes the average monthly notional value of futures contracts outstanding during the period: For the Three Months Ended March 31, 2018 2017 Average Notional Value $ 341,271,142 $ 293,898,322

Investments in Affiliates (Tabl

Investments in Affiliates (Tables)	3 Months Ended
	Mar. 31, 2018
Investments In And Advances To Affiliates Schedule Of Investments [Abstract]
Summary of Transactions in, and Earnings from, Investments in PowerShares Treasury Collateral Portfolio	The following is a summary of the transactions in, and earnings from, investments in affiliates (excluding affiliated money market mutual funds) for the three months ended March 31, 2018. Value 12/31/2017 Purchases at Cost Proceeds from Sales Change in Unrealized Appreciation (Depreciation) Realized Gain (Loss) Value 03/31/2018 Dividend Income PowerShares Treasury Collateral Portfolio $ 15,990,513 $ — $ — $ 62,279 $ — $ 16,052,792 $ —

Financial Highlights (Tables)

Financial Highlights (Tables)	3 Months Ended
	Mar. 31, 2018
Investment Company Financial Highlights [Abstract]
Schedule of Net Asset Value Per Share	NAV per Share is the NAV of the Fund divided by the number of outstanding Shares at the date of each respective period presented. Three Months Ended March 31, 2018 2017 Net Asset Value Net asset value per Share, beginning of period $ 19.39 $ 14.95 Net realized and change in unrealized gain (loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts (1.24 ) 1.44 Net investment income (loss) (a) 0.02 (0.01 ) Net income (loss) (1.22 ) 1.43 Net asset value per Share, end of period $ 18.17 $ 16.38 Market value per Share, beginning of period (b) $ 19.43 $ 14.91 Market value per Share, end of period (b) $ 18.20 $ 16.39 Ratio to average Net Assets (c) Net investment income (loss) 0.53 % (0.31 )% Expenses, after waivers 0.77 % 0.77 % Expenses, prior to waivers 0.79 % 0.78 % Total Return, at net asset value (d) (6.29 )% 9.57 % Total Return, at market value (d) (6.33 )% 9.93 % (a) Based on average shares outstanding. (b) The mean between the last bid and ask prices. (c) Annualized. (d) Total Return, at NAV is calculated assuming an initial investment made at the NAV at the beginning of the period, reinvestment of all dividends and distributions at NAV during the period, and redemption of Shares on the last day of the period. Total Return, at NAV includes adjustments in accordance with U.S. GAAP and as such, the NAV for financial reporting purposes and the returns based upon those NAVs may differ from the NAVs and returns for shareholder transactions. Total Return, at market value is calculated assuming an initial investment made at the market value at the beginning of the period, reinvestment of all dividends and distributions at market value during the period, and redemption of Shares at the market value on the last day of the period. Not annualized for periods less than one year, if applicable.

Subsequent Event (Tables)

Subsequent Event (Tables)	3 Months Ended
	Mar. 31, 2018
Subsequent Events [Abstract]
Schedule of Name Changes of Fund's Managing Owner, Fund and Trust	Effective on or about June 4, 2018, the name of the Fund’s Managing Owner, the name of the Trust and the name of the Fund will change and will be replaced as follows: Current Name of Managing Owner New Name of Managing Owner Invesco PowerShares Capital Management LLC Invesco Capital Management LLC Current Name of Trust New Name of Trust PowerShares DB Multi-Sector Commodity Trust Invesco DB Multi-Sector Commodity Trust Current Fund Name New Fund Name PowerShares DB Base Metals Fund Invesco DB Base Metals Fund

Organization - Additional Infor

Organization - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2018Basketshares	Dec. 31, 2017shares	Feb. 23, 2015shares	Aug. 03, 2006Trust
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Number of series of trust | Trust				7
General shares, shares issued	40	40	40
Purchase agreement transaction date	Feb. 23, 2015
Treasury obligation measurement maximum maturity period	12 months
Number of shares issued per basket	200,000
Minimum number of Baskets that can be purchased | Basket	1

Summary of Significant Accoun28

Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Accounting Policies [Abstract]
Distributed earnings	$ 0	$ 0
Average charges paid to broker per round-turn trade, maximum	13	$ 19
Payable for LME contracts			$ 731,031
Receivable for LME contracts	$ 233,762

Service Providers and Related29

Service Providers and Related Party Agreements - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Related Party Transactions [Abstract]
Management fee percentage per annum of daily NAV	0.75%
Managing owner waived fees	$ 12,268	$ 8,304

Deposits with Commodity Broke30

Deposits with Commodity Broker and Custodian - Additional Information (Detail) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Brokers And Dealers [Abstract]
Cash equivalents held by fund	$ 0	$ 0

Additional Valuation Informat31

Additional Valuation Information - Summary of the Tiered Valuation Input Levels (Detail) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
United States Treasury Obligations	$ 324,867,337	$ 244,408,079
Exchange-Traded Fund	16,052,792	15,990,513
Money Market Mutual Fund	18,619,245	23,103,724
Total Investments in Securities	359,539,374	283,502,316
Commodity Futures Contracts, Appreciation	4,359,619	31,489,170
Commodity Futures Contracts, Depreciation	(14,995,662)
Commodity Futures Contracts	(10,636,043)
Total Investments	348,903,331	314,991,486
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Exchange-Traded Fund	16,052,792	15,990,513
Money Market Mutual Fund	18,619,245	23,103,724
Total Investments in Securities	34,672,037	39,094,237
Commodity Futures Contracts, Appreciation	4,359,619	31,489,170
Commodity Futures Contracts, Depreciation	(14,995,662)
Commodity Futures Contracts	(10,636,043)
Total Investments	24,035,994	70,583,407
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
United States Treasury Obligations	324,867,337	244,408,079
Total Investments in Securities	324,867,337	244,408,079
Total Investments	$ 324,867,337	$ 244,408,079

Derivative Instruments - Fair V

Derivative Instruments - Fair Value of Derivative Instruments (Detail) - Commodity Futures Contract [Member] - Not Designated as Hedging Instrument [Member] - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Assets	$ 4,359,619	$ 31,489,170
Liabilities	$ (14,995,662)

Derivative Instruments - Summar

Derivative Instruments - Summary of Gross and Net Amounts of Offsetting Assets and Liabilities (Detail) - Commodity Futures Contract [Member] - Morgan Stanley & Co. LLC [Member] - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Offsetting Assets And Liabilities [Line Items]
Financial Derivative Assets	$ 4,359,619	$ 31,489,170
Financial Derivative Liabilities	(14,995,662)
Net value of derivatives	(10,636,043)	31,489,170
Collateral (Received)/Pledged, Non-Cash	$ 10,636,043
Net amount		$ 31,489,170

Derivative Instruments - Effect

Derivative Instruments - Effect of Derivative Instruments on Statements of Income and Expenses (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Futures contracts, realized gain (loss)	$ 18,607,089	$ 14,811,425
Futures contracts, unrealized gain (loss)	(42,125,213)	12,089,169
Net Realized and Net Change in Unrealized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts	(23,510,761)	26,883,849
Commodity Futures Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Futures contracts, realized gain (loss)	18,607,089	14,811,425
Futures contracts, unrealized gain (loss)	(42,125,213)	12,089,169
Net Realized and Net Change in Unrealized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts	$ (23,518,124)	$ 26,900,594

Derivative Instruments - Summ35

Derivative Instruments - Summary of Average Monthly and Quarterly Notional Value of Future Contracts Outstanding (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Weighted Average [Member] | Commodity Futures Contract [Member]
Derivative [Line Items]
Average Notional Value	$ 341,271,142	$ 293,898,322

Investments in Affiliates - Sum

Investments in Affiliates - Summary of Transactions in, and Earnings from, Investments in Affiliates (Excluding Affiliated Money Market Funds) (Detail) - USD ($)		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Investments In And Advances To Affiliates [Line Items]
Beginning Value		$ 39,094,237
Change in Unrealized Appreciation (Depreciation)		(54,916)	$ (21,904)
Ending Value		34,672,037
Affiliated Investments [Member]
Investments In And Advances To Affiliates [Line Items]
Beginning Value		39,094,237
Ending Value		34,672,037
Affiliated Investments [Member] | Exchange-Traded Fund - PowerShares Treasury Collateral Portfolio [Member]
Investments In And Advances To Affiliates [Line Items]
Beginning Value		15,990,513
Change in Unrealized Appreciation (Depreciation)		62,279
Ending Value	[1]	$ 16,052,792
[1]	Affiliated company. The security and the Fund are affiliated by having the same investment adviser. See Note 8.

Share Purchases and Redemptio37

Share Purchases and Redemptions - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2018Basketshares
Equity [Abstract]
Minimum number of Baskets that can be purchased	1
Number of shares issued per basket | shares	200,000
Minimum number of Baskets that can be redeemed	1

Financial Highlights - Schedule

Financial Highlights - Schedule of Net Asset Value Per Share (Detail) - $ / shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net Asset Value
Net asset value per Share, beginning of period	$ 19.39	$ 14.95
Net realized and change in unrealized gain (loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts	(1.24)	1.44
Net investment income (loss)	0.02	(0.01)
Net income (loss)	(1.22)	1.43
Net asset value per Share, end of period	18.17	16.38
Market value per Share, beginning of period	19.43	14.91
Market value per Share, end of period	$ 18.20	$ 16.39
Ratio to average Net Assets
Net investment income (loss)	0.53%	(0.31%)
Expenses, after waivers	0.77%	0.77%
Expenses, prior to waivers	0.79%	0.78%
Total Return, at net asset value	(6.29%)	9.57%
Total Return, at market value	(6.33%)	9.93%

Subsequent Event - Additional I

Subsequent Event - Additional Information (Detail)	May 08, 2018
Subsequent Event [Member]
Subsequent Event [Line Items]
Effective date of name changes	Jun. 4, 2018