Invesco DB Base Metals Fund (DBB) 10-K 9 Mar 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2014	Jan. 31, 2015	Jun. 30, 2014
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	FALSE
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Trading Symbol	DBB
Entity Registrant Name	POWERSHARES DB BASE METALS FUND
Entity Central Index Key	1383084
Current Fiscal Year End Date	-19
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		11,600,000
Entity Public Float			$315,828,000

Statements_of_Financial_Condit

Statements of Financial Condition (USD $)	Dec. 31, 2014	Dec. 31, 2013
Assets
United States Treasury Obligations, at fair value (cost $236,993,093 and $227,984,035, respectively)	$236,994,724	$227,989,243
Cash held by commodity broker	27,364,752	24,778,734
Net unrealized appreciation (depreciation) on commodity futures contracts	-13,474,175	-4,049,888
Equity in broker trading accounts (of which $18,366,219 and $19,456,837, respectively, is restricted for maintenance margin purposes)	250,885,301	248,718,089
Total assets	250,885,301	248,718,089
Liabilities
Payable for LME contracts	7,104,250	10,668,706
Payable for securities purchased	22,997,987	2,999,507
Management fee payable	130,925	150,010
Brokerage fee payable	4,635	4,797
Total liabilities	30,237,797	13,823,020
Commitments and Contingencies (Note 8)
Equity
Shareholders' equity - General Shares	640	671
Shareholders' equity - Shares	220,646,864	234,894,398
Total shareholders' equity	220,647,504	234,895,069
Total liabilities and equity	$250,885,301	$248,718,089
General Shares outstanding	40	40
Shares outstanding	13,800,000	14,000,000
Net asset value per share
General Shares	$15.99	$16.78
Shares	$15.99	$16.78

Statements_of_Financial_Condit1

Statements of Financial Condition (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Restricted investments	$18,366,219	$19,456,837
United States Treasury Obligations [Member]
United States Treasury Obligations, cost	$236,993,093	$227,984,035

Schedule_of_Investments_Treasu

Schedule of Investments - Treasury Bills (USD $)	Dec. 31, 2014	Dec. 31, 2013
Schedule of Investments [Line Items]
Fair Value	$236,994,724	$227,989,243
U.S Treasury Bills 0.030% due January 2, 2014 [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity		1.28%
Fair Value		3,000,000
Face Value		3,000,000
U.S Treasury Bills 0.025% due January 9, 2014 [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity		0.85%
Fair Value		1,999,996
Face Value		2,000,000
U.S Treasury Bills 0.005% due January 23, 2014 [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity		30.65%
Fair Value		71,999,496
Face Value		72,000,000
U.S Treasury Bills 0.005% due January 30, 2014 [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity		23.84%
Fair Value		55,999,440
Face Value		56,000,000
U.S Treasury Bills 0.050% due February 6, 2014 [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity		2.55%
Fair Value		5,999,946
Face Value		6,000,000
U.S Treasury Bills 0.075% due February 13, 2014 [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity		5.11%
Fair Value		11,999,892
Face Value		12,000,000
U.S Treasury Bills 0.080% due February 20, 2014 [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity		0.85%
Fair Value		1,999,952
Face Value		2,000,000
U.S Treasury Bills 0.075% due March 6, 2014 [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity		6.81%
Fair Value		15,998,672
Face Value		16,000,000
U.S Treasury Bills 0.070% due March 13, 2014 [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity		0.43%
Fair Value		999,932
Face Value		1,000,000
U.S Treasury Bills 0.065% due March 20, 2014 [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity		6.81%
Fair Value		15,998,112
Face Value		16,000,000
U.S Treasury Bills 0.070% due March 27, 2014 [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity		16.60%
Fair Value		38,994,306
Face Value		39,000,000
U.S Treasury Bills 0.065% due April 3, 2014 [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity		1.28%
Fair Value		2,999,499
Face Value		3,000,000
United States Treasury Obligations [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity	107.41%	97.06%
Fair Value	236,994,724	227,989,243
Face Value
U.S. Treasury Bills, 0.030% due January 2, 2015 [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity	10.42%
Fair Value	23,000,000
Face Value	23,000,000
U.S. Treasury Bills, 0.020% due January 15, 2015 [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity	3.63%
Fair Value	7,999,944
Face Value	8,000,000
U.S. Treasury Bills, 0.010% due January 22, 2015 [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity	18.13%
Fair Value	39,999,440
Face Value	40,000,000
U.S. Treasury Bills, 0.015% due January 29, 2015 [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity	21.30%
Fair Value	46,999,295
Face Value	47,000,000
U.S. Treasury Bills, 0.010% due February 5, 2015 [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity	23.57%
Fair Value	51,999,012
Face Value	52,000,000
U.S. Treasury Bills, 0.025% due February 12, 2015 [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity	10.88%
Fair Value	23,999,664
Face Value	24,000,000
U.S. Treasury Bills, 0.025% due March 12, 2015 [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity	1.36%
Fair Value	2,999,886
Face Value	3,000,000
U.S. Treasury Bills, 0.055% due March 26, 2015 [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity	7.70%
Fair Value	16,999,507
Face Value	17,000,000
U.S. Treasury Bills, 0.040% due April 2, 2015 [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity	10.42%
Fair Value	22,997,976
Face Value	$23,000,000

Schedule_of_Investments_Treasu1

Schedule of Investments - Treasury Bills (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2014
U.S Treasury Bills 0.030% due January 2, 2014 [Member]
Schedule of Investments [Line Items]
Investment interest rate	0.03%
Investment maturity date	2-Jan-14
U.S Treasury Bills 0.025% due January 9, 2014 [Member]
Schedule of Investments [Line Items]
Investment interest rate	0.03%
Investment maturity date	9-Jan-14
U.S Treasury Bills 0.005% due January 23, 2014 [Member]
Schedule of Investments [Line Items]
Investment interest rate	0.01%
Investment maturity date	23-Jan-14
U.S Treasury Bills 0.005% due January 30, 2014 [Member]
Schedule of Investments [Line Items]
Investment interest rate	0.01%
Investment maturity date	30-Jan-14
U.S Treasury Bills 0.050% due February 6, 2014 [Member]
Schedule of Investments [Line Items]
Investment interest rate	0.05%
Investment maturity date	6-Feb-14
U.S Treasury Bills 0.075% due February 13, 2014 [Member]
Schedule of Investments [Line Items]
Investment interest rate	0.08%
Investment maturity date	13-Feb-14
U.S Treasury Bills 0.080% due February 20, 2014 [Member]
Schedule of Investments [Line Items]
Investment interest rate	0.08%
Investment maturity date	20-Feb-14
U.S Treasury Bills 0.075% due March 6, 2014 [Member]
Schedule of Investments [Line Items]
Investment interest rate	0.08%
Investment maturity date	6-Mar-14
U.S Treasury Bills 0.070% due March 13, 2014 [Member]
Schedule of Investments [Line Items]
Investment interest rate	0.07%
Investment maturity date	13-Mar-14
U.S Treasury Bills 0.065% due March 20, 2014 [Member]
Schedule of Investments [Line Items]
Investment interest rate	0.07%
Investment maturity date	20-Mar-14
U.S Treasury Bills 0.070% due March 27, 2014 [Member]
Schedule of Investments [Line Items]
Investment interest rate	0.07%
Investment maturity date	27-Mar-14
U.S Treasury Bills 0.065% due April 3, 2014 [Member]
Schedule of Investments [Line Items]
Investment interest rate	0.07%
Investment maturity date	3-Apr-14
United States Treasury Obligations [Member]
Schedule of Investments [Line Items]
United States Treasury Obligations, cost	227,984,035	236,993,093
U.S. Treasury Bills, 0.030% due January 2, 2015 [Member]
Schedule of Investments [Line Items]
Investment interest rate		0.03%
Investment maturity date		2-Jan-15
U.S. Treasury Bills, 0.020% due January 15, 2015 [Member]
Schedule of Investments [Line Items]
Investment interest rate		0.02%
Investment maturity date		15-Jan-15
U.S. Treasury Bills, 0.010% due January 22, 2015 [Member]
Schedule of Investments [Line Items]
Investment interest rate		0.01%
Investment maturity date		22-Jan-15
U.S. Treasury Bills, 0.015% due January 29, 2015 [Member]
Schedule of Investments [Line Items]
Investment interest rate		0.02%
Investment maturity date		29-Jan-15
U.S. Treasury Bills, 0.010% due February 5, 2015 [Member]
Schedule of Investments [Line Items]
Investment interest rate		0.01%
Investment maturity date		5-Feb-15
U.S. Treasury Bills, 0.025% due February 12, 2015 [Member]
Schedule of Investments [Line Items]
Investment interest rate		0.03%
Investment maturity date		12-Feb-15
U.S. Treasury Bills, 0.025% due March 12, 2015 [Member]
Schedule of Investments [Line Items]
Investment interest rate		0.03%
Investment maturity date		12-Mar-15
U.S. Treasury Bills, 0.055% due March 26, 2015 [Member]
Schedule of Investments [Line Items]
Investment interest rate		0.06%
Investment maturity date		26-Mar-15
U.S. Treasury Bills, 0.040% due April 2, 2015 [Member]
Schedule of Investments [Line Items]
Investment interest rate		0.04%
Investment maturity date		2-Apr-15

Schedule_of_Investments_Future

Schedule of Investments - Future Contracts (USD $)	Dec. 31, 2014	Dec. 31, 2013
LME Aluminum (1,605 contracts, settlement date October 19, 2015) [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders' Equity	-4.44%
Unrealized Appreciation/ (Depreciation)	($9,797,319)
Notional Market Value	75,665,719
LME Copper (494 contracts, settlement date February 16, 2015) [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders' Equity	-0.61%
Unrealized Appreciation/ (Depreciation)	-1,336,762
Notional Market Value	78,138,450
LME Zinc (1,467 contracts, settlement date February 16, 2015 [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders' Equity	-1.06%
Unrealized Appreciation/ (Depreciation)	-2,340,094
Notional Market Value	79,630,594
Total Commodity Futures Contracts [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders' Equity	-6.11%	-1.72%
Unrealized Appreciation/ (Depreciation)	-13,474,175	-4,049,888
Notional Market Value	233,434,763	246,110,944
LME Aluminum (1,690 contracts, settlement date October 13, 2014) [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders' Equity		-0.87%
Unrealized Appreciation/ (Depreciation)		-2,041,975
Notional Market Value		78,996,938
LME Copper (447 contracts, settlement date March 17, 2014) [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders' Equity		-2.68%
Unrealized Appreciation/ (Depreciation)		-6,306,100
Notional Market Value		82,312,256
LME Zinc (1,623 contracts, settlement date December 15, 2014) [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders' Equity		1.83%
Unrealized Appreciation/ (Depreciation)		4,298,187
Notional Market Value		$84,801,750

Schedule_of_Investments_Future1

Schedule of Investments - Future Contracts (Parenthetical)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
	Contract	Contract
LME Aluminum (1,605 contracts, settlement date October 19, 2015) [Member]
Schedule of Investments [Line Items]
Open option contracts written, number of contracts	1,605
Forward contract indexed to issuer's equity, settlement date or dates	19-Oct-15
LME Copper (494 contracts, settlement date February 16, 2015) [Member]
Schedule of Investments [Line Items]
Open option contracts written, number of contracts	494
Forward contract indexed to issuer's equity, settlement date or dates	16-Feb-15
LME Zinc (1,467 contracts, settlement date February 16, 2015 [Member]
Schedule of Investments [Line Items]
Open option contracts written, number of contracts	1,467
Forward contract indexed to issuer's equity, settlement date or dates	16-Feb-15
LME Aluminum (1,690 contracts, settlement date October 13, 2014) [Member]
Schedule of Investments [Line Items]
Open option contracts written, number of contracts		1,690
Forward contract indexed to issuer's equity, settlement date or dates		13-Oct-14
LME Copper (447 contracts, settlement date March 17, 2014) [Member]
Schedule of Investments [Line Items]
Open option contracts written, number of contracts		447
Forward contract indexed to issuer's equity, settlement date or dates		17-Mar-14
LME Zinc (1,623 contracts, settlement date December 15, 2014) [Member]
Schedule of Investments [Line Items]
Open option contracts written, number of contracts		1,623
Forward contract indexed to issuer's equity, settlement date or dates		15-Dec-14

Statements_of_Income_and_Expen

Statements of Income and Expenses (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income
Interest Income	$86,176	$138,275	$230,197
Expenses
Management Fee	2,219,818	2,223,612	2,559,969
Brokerage Commissions and Fees	86,793	54,445	100,099
Total expenses	2,306,611	2,278,057	2,660,068
Net investment income (loss)	-2,220,435	-2,139,782	-2,429,871
Net Realized Gain (Loss) on Net Realized and Net Change in Unrealized Gain (Loss) on U.S. Treasury Obligations and Futures Contracts
United States Treasury Obligations	4,199	6,057	2,281
Futures	-684,350	-39,635,482	-84,992,271
Net realized gain (loss)	-680,151	-39,629,425	-84,989,990
Net Change in Unrealized Gain (Loss) on
United States Treasury Obligations	-3,577	-11,495	16,043
Futures	-9,424,287	-5,121,223	92,457,166
Net change in unrealized gain (loss)	-9,427,864	-5,132,718	92,473,209
Net realized and net change in unrealized gain (loss) on United States Treasury Obligations and Futures	-10,108,015	-44,762,143	7,483,219
Net Income (Loss)	($12,328,450)	($46,901,925)	$5,053,348

Statement_of_Changes_in_Shareh

Statement of Changes in Shareholders Equity (USD $)	Total	General Shares [Member]	General Shares [Member]	Shares [Member]	Shares [Member]
	USD ($)		Total Equity [Member]		Total Equity [Member]
			USD ($)		USD ($)
Balance, Value at Dec. 31, 2011	$366,933,675		$749		$366,932,926
Balance Shares at Dec. 31, 2011		40		19,600,000
Sale of Shares, Value	95,745,240				95,745,240
Sale of Shares, Shares				4,800,000
Redemption of Shares, Value	-157,753,726				-157,753,726
Redemption of Shares, Shares				-8,200,000
Net Increase (Decrease) due to Share Transactions, Value	-62,008,486				-62,008,486
Net Increase (Decrease) due to Share Transactions, Share				-3,400,000
Net Income (Loss)
Net investment income (loss)	-2,429,871		-8		-2,429,863
Net realized gain (loss) on United States Treasury Obligations and Futures	-84,989,990		-269		-84,989,721
Net change in unrealized gain (loss) on United States Treasury Obligations and Futures	92,473,209		293		92,472,916
Net Income (Loss)	5,053,348		16		5,053,332
Net Change in Shareholders' Equity, Value	-56,955,138		16		-56,955,154
Net Change in Shareholders' Equity, Shares				-3,400,000
Balance, Value at Dec. 31, 2012	309,978,537		765		309,977,772
Balance Shares at Dec. 31, 2012		40		16,200,000
Sale of Shares, Value	164,285,896				164,285,896
Sale of Shares, Shares				9,200,000
Redemption of Shares, Value	-192,467,439				-192,467,439
Redemption of Shares, Shares				-11,400,000
Net Increase (Decrease) due to Share Transactions, Value	-28,181,543				-28,181,543
Net Increase (Decrease) due to Share Transactions, Share				-2,200,000
Net Income (Loss)
Net investment income (loss)	-2,139,782		-4		-2,139,778
Net realized gain (loss) on United States Treasury Obligations and Futures	-39,629,425		-80		-39,629,345
Net change in unrealized gain (loss) on United States Treasury Obligations and Futures	-5,132,718		-10		-5,132,708
Net Income (Loss)	-46,901,925		-94		-46,901,831
Net Change in Shareholders' Equity, Value	-75,083,468		-94		-75,083,374
Net Change in Shareholders' Equity, Shares				-2,200,000
Balance, Value at Dec. 31, 2013	234,895,069		671		234,894,398
Balance Shares at Dec. 31, 2013		40		14,000,000
Sale of Shares, Value	255,008,996				255,008,996
Sale of Shares, Shares				15,200,000
Redemption of Shares, Value	-256,928,111				-256,928,111
Redemption of Shares, Shares	200,000			-15,400,000
Net Increase (Decrease) due to Share Transactions, Value	-1,919,115				-1,919,115
Net Increase (Decrease) due to Share Transactions, Share				-200,000
Net Income (Loss)
Net investment income (loss)	-2,220,435		-5		-2,220,430
Net realized gain (loss) on United States Treasury Obligations and Futures	-680,151		-2		-680,149
Net change in unrealized gain (loss) on United States Treasury Obligations and Futures	-9,427,864		-24		-9,427,840
Net Income (Loss)	-12,328,450		-31		-12,328,419
Net Change in Shareholders' Equity, Value	-14,247,565		-31		-14,247,534
Net Change in Shareholders' Equity, Shares				-200,000
Balance, Value at Dec. 31, 2014	$220,647,504		$640		$220,646,864
Balance Shares at Dec. 31, 2014		40		13,800,000

Statements_of_Cash_Flows

Statements of Cash Flows (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flow from operating activities:
Net Income (Loss)	($12,328,450)	($46,901,925)	$5,053,348
Adjustments to reconcile net income (loss) to net cash provided by (used for) operating activities:
Cost of securities purchased	-1,206,913,829	-1,181,845,878	-1,293,737,736
Proceeds from securities sold and matured	1,217,996,074	1,234,496,115	1,373,995,316
Net accretion of discount on United States Treasury Obligations	-88,624	-154,797	-236,394
Net realized (gain) loss on United States Treasury Obligations	-4,199	-6,057	-2,281
Net change in unrealized (gain) loss on United States Treasury Obligations and Futures	9,427,864	5,132,718	-92,473,209
Change in operating receivables and liabilities:
Payable for LME contracts	-3,564,456	7,590,537	-22,590,581
Management fee payable	-19,085	-51,607	-40,562
Brokerage fee payable	-162	4,524	-5,754
Net cash provided by (used for) operating activities	4,505,133	18,263,630	-30,037,853
Cash flows from financing activities:
Proceeds from sale of Shares	255,008,996	164,285,896	95,745,240
Redemption of Shares	-256,928,111	-192,467,439	-157,753,726
Net cash provided by (used for) financing activities	-1,919,115	-28,181,543	-62,008,486
Net change in cash held by commodity broker	2,586,018	-9,917,913	-92,046,339
Cash held by commodity broker at beginning of year	24,778,734	34,696,647	126,742,986
Cash held by commodity broker at end of year	$27,364,752	$24,778,734	$34,696,647

BackgroundOrganization

Background/Organization	12 Months Ended
	Dec. 31, 2014
Equity [Abstract]
Background/Organization	(1) Background/Organization
	On October 24, 2014, DB Commodity Services LLC, a Delaware limited liability company (“DBCS”), DB U.S. Financial Markets Holding Corporation (“DBUSH”) and Invesco PowerShares Capital Management LLC (“Invesco”) entered into an Asset Purchase Agreement (the “Agreement”). DBCS is a wholly-owned subsidiary of DBUSH. DBCS agreed to transfer and sell to Invesco all of DBCS’ interest in the PowerShares DB Base Metals Fund (the “Fund”), including the sole and exclusive power to direct the business and affairs of the Fund, as well as certain other assets pertaining to the management of the Fund, pursuant to the terms and conditions of the Agreement (the “Transaction”).
	The Transaction was consummated on February 23, 2015 (the “Closing Date”). Invesco now serves as the managing owner (the “Managing Owner”), commodity pool operator and commodity trading advisor of the Fund, in replacement of DBCS (the “Predecessor Managing Owner”).
	The Fund is a separate series of the Trust. The Trust is a Delaware statutory trust organized in seven separate series and was formed on August 3, 2006. The Predecessor Managing Owner seeded the Fund with a capital contribution of $1,000 in exchange for 40 General Shares of the Fund. The General Shares were sold to the Managing Owner by the Predecessor Managing Owner pursuant to the terms of the Agreement. The fiscal year end of the Fund is December 31st. 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 (the “Trust Agreement”).
	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 proceeds from the offering of Shares are invested in the Fund. 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 (the “NYSE Alternext”)) on January 5, 2007 and, as of November 25, 2008, is listed on the NYSE Arca, Inc. (the “NYSE Arca”).
	This Report covers the year ended December 31, 2014, 2013 and 2012 (herein referred to, as the “Year Ended December 31, 2014”, the “Year Ended December 31, 2013” and the “Year Ended December 31, 2012”, respectively). The Fund’s performance information from inception up to and excluding the Closing Date is a reflection of the performance associated with the Predecessor Managing Owner. Past performance of the Fund is not necessarily indicative of future performance.

Fund_Investment_Overview

Fund Investment Overview	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Fund Investment Overview	(2) Fund Investment Overview
	The Fund invests with a view to tracking the changes, whether positive or negative, in the level of the DBIQ–Optimum Yield Industrial Metals Index Excess Return™ (the “DBIQ-OY Industrial Metals ER™”, or the “Index”) over time, plus the excess, if any, of the Fund’s interest income from its holdings of United States Treasury Obligations and other high credit quality short-term fixed income securities over the expenses of the Fund.
	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 Index Commodities are currently trading on the London Metals Exchange (the “LME”). Although the LME does not currently impose position limits on the Index Commodities, the LME may in the future impose position limits on market participants trading in certain commodities included in the Index. Further, in the event the Fund invests in alternative futures contracts as described below, that trade on a U.S. exchange, the Commodity Futures Trading Commission (the “CFTC”) and commodity exchanges may impose position limits on market participants trading in the commodity included in the Index. The Index is comprised of futures contracts on each of the Index Commodities that expire in a specific month and trade on a specific exchange (the “Index Contracts”). As disclosed in the Fund’s Prospectus, if the Managing Owner determines in its commercially reasonable judgment that it has become impracticable or inefficient for any reason for the Fund to gain full or partial exposure to any Index Commodity by investing in a specific Index Contract, the Fund may invest in (i) a futures contract referencing the particular Index Commodity other than the Index Contract or, in the alternative, invest in (ii) other futures contracts not based on the particular Index Commodity ((i) and (ii) collectively, the “Alternative Futures Contracts”) if, in the commercially reasonable judgment of the Managing Owner, such Alternative Futures Contracts tend to exhibit trading prices that correlate with such Index Commodity.
	The Fund does not borrow money to increase leverage. As of December 31, 2014 and 2013, the Fund had $250,885,301 (or 100% of its total assets) and $248,718,089 (or 100% of its total assets), respectively, of its holdings of cash, United States Treasury Obligations and unrealized appreciation/depreciation on futures contracts on deposit with its Commodity Broker. Of this, $18,366,219 (or 7.3%) and $19,456,837 (or 7.8%) is required to be deposited to satisfy maintenance margin required by the Comodity Broker for the Fund’s long futures positions. For additional information, please see the audited Schedule of Investments as of December 31, 2014 and 2013 for details of the Fund’s portfolio holdings.

Service_Providers_and_Related_

Service Providers and Related Party Agreements	12 Months Ended
	Dec. 31, 2014
Related Party Transactions [Abstract]
Service Providers and Related Party Agreements	(3) Service Providers and Related Party Agreements
	The Trustee
	Under the Trust Agreement, Wilmington Trust Company, the trustee of the Fund (the “Trustee”) has delegated to the Managing Owner the exclusive management and control of all aspects of the business of the Trust and the Fund. 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 the Fund as 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 net asset value of the Fund; provided, however, for purposes of the reporting period of this Form 10-K and up to the Closing Date, all Management Fees were payable to the Predecessor Managing Owner (the “Management Fee”).
	During the Year Ended December 31, 2014, the Fund incurred Management Fees of $2,219,818, of which $130,925 was payable at December 31, 2014. During the Year Ended December 31, 2013, the Fund incurred Management Fees of $2,223,612, of which $150,010 was payable at December 31, 2013. During the Year Ended December 31, 2012, the Fund incurred Management Fees of $2,559,969.
	The Commodity Broker
	Effective as of the Closing Date, Morgan Stanley & Co. LLC, a Delaware limited liability company, serves as the Fund’s futures clearing broker (“Commodity Broker”); provided, however, Deutsche Bank Securities Inc. (“DBSI”), a Delaware corporation, served as the Fund’s futures clearing broker prior to and during the reporting period of this Form 10-K and up to the Closing Date (the “Predecessor Commodity Broker”). DBSI is also an indirect wholly-owned subsidiary of Deutsche Bank AG and is an affiliate of the Predecessor Managing Owner. In its capacity as clearing broker, the Commodity Broker executes and clears each of the Fund’s futures transactions and performs certain administrative and custodial services for the Fund. As custodian of the Fund’s assets, the Commodity Broker is responsible, among other things, for providing periodic accountings of all dealings and actions taken by the Trust on behalf of 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. For the Year Ended December 31, 2014, the Fund incurred brokerage fees of $86,793, of which $4,635 was payable at December 31, 2014. For the Year Ended December 31, 2013, the Fund incurred brokerage fees of $54,445, of which $4,797 was payable at December 31, 2013. For the Year Ended December 31, 2012, the Fund incurred brokerage fees of $100,099.
	The Administrator, Custodian and Transfer Agent
	The Bank of New York Mellon (the “Administrator”) is the administrator, custodian and transfer agent of the Fund, and has 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, net asset value calculations, accounting and other fund administrative services. The Administrator retains 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 and other unaffiliated futures commission merchants. As of December 31, 2014 and 2013, there were no Fund assets held by the Administrator.
	The Distributor
	ALPS Distributors, Inc. (the “Distributor”) provides certain distribution services to the Fund. Pursuant to the Distribution Services Agreement among the Managing Owner in its capacity as managing owner of the Fund, the Fund and the Distributor, the Distributor assists the Managing Owner and the Administrator with certain functions and duties relating to distribution and marketing services to the Fund including reviewing and approving marketing materials.
	Index Sponsor
	Effective as of the Closing Date, the Managing Owner, on behalf of the Fund, has appointed Deutsche Bank Securities Inc. to serve as the index sponsor (the “Index Sponsor”). (Prior to the Closing Date, the index sponsor was Deutsche Bank AG London.) 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 for performing its duties.
	Marketing Agent
	Effective as of the Closing Date, the Managing Owner, on behalf of the Fund, has appointed Deutsche Bank Securities Inc. as the marketing agent (the “Marketing Agent”) to assist the Managing Owner by providing support to educate institutional investors about the Deutsche Bank indices and to complete governmental or institutional due diligence questionnaires or requests for proposals related to the Deutsche Bank indices.
	The Managing Owner pays the Marketing Agent a marketing services fee.
	The Marketing Agent will not open or maintain customer accounts or handle orders for the Fund. The Marketing Agent has no responsibility for the performance of the Fund or the decisions made or actions taken by the Managing Owner.

Summary_of_Significant_Account

Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2014

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

(4) Summary of Significant Accounting Policies

(a) Basis of Presentation

The financial statements of the Fund have been prepared using U.S. generally accepted accounting principles (“U.S. GAAP”).

In June 2013, the Financial Accounting Standards Board (“FASB”) issued updated guidance clarifying the characteristics of an investment company and requiring new disclosures. Under the guidance, all entities regulated under the Investment Company Act of 1940 automatically qualify as investment companies, while all other entities need to consider both the fundamental and typical characteristics of an investment company in determining whether they qualify as investment companies. This new guidance is effective for interim or annual reporting periods that begin after December 15, 2013, and should be applied prospectively. The Fund adopted this guidance effective January 1, 2014. The Fund has determined that it meets the definition of an investment company and has prepared the financial statements in conformity with accounting and reporting guidance of the FASB Accounting Standards Codification Topic 946—Investment Companies, which is part of U.S. GAAP. The adoption of this guidance had no effect on the Fund’s statements of financial condition, including the schedule of investments, and the related statements of income and expenses, changes in shareholders’ equity and of cash flows.

In August 2014, the FASB issued a new standard, Accounting Standards Update No. 2014-15 Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern, which will explicitly require management to assess an entity’s ability to continue as a going concern and to provide related footnote disclosure in certain circumstances. This new guidance is effective for all entities in the first annual reporting period ending after December 15, 2016. The Fund is currently evaluating this guidance and its impact on the Fund’s financial statement disclosures.

(b) Use of Estimates

The preparation of the financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, revenues and expenses and related disclosure of contingent assets and liabilities during the reporting period of the financial statements and accompanying notes. Actual results could differ from those estimates. There were no significant estimates used in the preparation of these financial statements.

(c) Financial Instruments and Fair Value

United States Treasury Obligations and commodity futures contracts are recorded in the statements of financial condition on a trade date basis at fair value with changes in fair value recognized in earnings in each period. The fair value of a financial instrument is the amount 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 (the exit price). 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.

Financial Accounting Standards Board (FASB) Accounting Standards Codification fair value measurement and disclosure guidance requires a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets and liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy are described below:

Basis of Fair Value Measurement

Level 1:

Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities;

Level 2:

Quoted prices in markets that are not active or financial instruments for which all significant inputs are observable, either directly or indirectly;

Level 3:

Prices or valuations that require inputs that are both significant to the fair value measurement and unobservable.

A financial instrument’s level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement.

In determining fair value of United States Treasury Obligations, the Fund uses unadjusted quoted market prices in active markets. United States Treasury Obligations are classified within Level 1 of the fair value hierarchy. The Fund does not adjust the quoted prices for United States Treasury Obligations.

In determining fair value of LME commodity futures contracts, the Fund uses valuation pricing based on action of a committee that incorporates prices from the most liquid trading sessions of the day and can also rely on other inputs such as trades, bids and offers (including indicative bids and offers) transacted throughout the whole day. During the year ended December 31, 2013, management changed the classification of LME commodity futures from Level 1 to Level 2.

Assets and Liabilities Measured at Fair Value were as follows:

December 31, 2014

December 31, 2013

United States Treasury Obligations (Level 1)

$

236,994,724

$

227,989,243

Commodity Futures Contracts (Level 2)

$

(13,474,175

)

$

(4,049,888

)

There were no Level 3 holdings during the years ended December 31, 2014, 2013 and 2012. The Fund’s policy is to recognize transfers in and out of the valuation levels as of the end of the reporting period. Futures contracts in a net depreciation position of $4,049,888 were transferred from Level 1 to Level 2 during the year ended December 31, 2013 as described above.

(d) Deposits with Commodity Broker

The Fund deposits cash and United States Treasury Obligations with its Commodity Broker subject to CFTC regulations and various exchange and Commodity 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 (variation margin) represents the Fund’s overall equity in its broker trading account. To meet the Fund’s initial margin requirements, the Fund holds United States Treasury Obligations. The Fund uses its cash held by the Commodity Broker to satisfy variation margin requirements. The Fund earns interest on its cash deposited with the Commodity Broker.

(e) United States Treasury Obligations

The Fund records purchases and sales of United States Treasury Obligations on a trade date basis. These holdings are marked to market based on quoted market closing prices. The Fund holds United States Treasury Obligations for deposit with the Fund’s Commodity Broker to meet margin requirements and for trading purposes. Interest income is recognized on an accrual basis when earned. Premiums and discounts are amortized or accreted in interest income over the life of the United States Treasury Obligations. The Fund purchased $23,000,000 face amount of United States Treasury Obligations valued at $22,997,987 which was recorded as a payable for securities puchased as of December 31, 2014. The Fund purchased $3,000,000 face amount of United States Treasury Obligations valued at $2,999,507 which was recorded as a payable for securities purchased as of December 31, 2013.

(f) Cash Held by Commodity Broker

The Fund’s arrangement with the Commodity Broker requires the Fund to meet its variation margin requirement related to the price movements, both positive and negative, on futures contracts held by the Fund by keeping cash on deposit with the Commodity Broker. The Fund defines cash and cash equivalents to be highly liquid investments, with original maturities of three months or less when purchased. As of December 31, 2014 and 2013, the Fund had cash held with the Commodity Broker of $27,364,752 and $24,778,734, respectively. There were no cash equivalents held by the Fund as of December 31, 2014 and 2013.

(g) Receivable/ (Payable) for LME Contracts

The Fund trades aluminum, copper and zinc commodity future contracts on the London Metals Exchange (“LME”). For settlement of futures contracts traded on the LME, cash is not transferred until the settled futures contracts expire. As of December 31, 2014 and 2013, the Fund had payables to the Commodity Broker for contracts on the LME $7,104,250 and $10,668,706, respectively, related to net realized losses on LME contracts which have been closed out but the contract is not yet expired.

(h) Income Taxes

The Fund is classified as a partnership for U.S. federal income tax purposes. Accordingly, the Fund will 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.

Management of the Fund has reviewed all open tax years and major jurisdictions and concluded that there is no tax liability resulting from unrecognized tax benefits relating to uncertain income tax positions taken or expected to be taken in future tax returns. The Funds are 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. On an ongoing basis, management will monitor its tax positions taken under the interpretation (and consult with its tax counsel from time to time when appropriate) to determine if adjustments to conclusions are necessary based on factoring including, but not limited to, on-going analysis of tax law, regulation, and interpretations thereof. The major tax jurisdiction for the Fund and the earliest tax year subject to examination: United States, 2010.

(i) Futures Contracts

All commodity futures contracts are held and used for trading purposes. The commodity futures contracts are recorded on a trade date basis and open contracts are recorded in the statement of financial condition at fair value on the last business day of the period, which represents market value for those commodity futures for which market quotes are readily available. However, 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. Realized gains (losses) and changes in unrealized appreciation (depreciation) on open positions are determined on a specific identification basis and recognized in the statement of income and expenses in the period in which the contract is closed or the changes occur, respectively. For the years ended December 31, 2014 and 2013, the average notional market value of futures contracts held was $306.6 million and $304.7 million, respectively.

The Fair Value of Derivative Instruments as of December 31, 2014 is as follows:

Derivatives not Accounted for as Hedging Instruments

Statements of Financial Condition Location

Net Unrealized

Appreciation /

(Depreciation)

Commodity Futures Contracts

Net Unrealized Appreciation (Depreciation) on Futures Contracts

$

(13,474,175

)

The Fair Value of Derivative Instruments as of December 31, 2013 is as follows:

Derivatives not Accounted for as Hedging Instruments

Statements of Financial Condition Location

Net Unrealized

Appreciation /

(Depreciation)

Commodity Futures Contracts

Net Unrealized Appreciation (Depreciation) on Futures Contracts

$

(4,049,888

)

The Effect of Derivative Instruments on the Statements of Income and Expenses is as follows:

For the Year Ended

For the Year Ended

For the Year Ended

December 31, 2014

December 31, 2013

December 31, 2012

Derivatives not

Location of Gain or (Loss) on

Realized Gain

Change in

Realized Gain

Change in

Realized Gain

Change in

Accounted for as

Derivatives Recognized in Income

or (Loss) on

Unrealized  Gain

or (Loss) on

Unrealized Gain

or (Loss) on

Unrealized Gain

Hedging

Derivatives

or (Loss) on

Derivatives

or (Loss) on

Derivatives

or (Loss) on

Instruments

Recognized  in

Derivatives

Recognized in

Derivatives

Recognized in

Derivatives

Income

Recognized  in

Income

Recognized in

Income

Recognized in

Income

Income

Income

Commodity Futures Contracts

Net Realized Gain (Loss) on Futures

$

(684,350

)

—

$

(39,635,482

)

—

$

(84,992,271

)

—

Net Change in Unrealized Gain (Loss) on Futures

—

$

(9,424,287

)

—

$

(5,121,223

)

—

$

92,457,166

The Fund utilizes derivative instruments to achieve its investment objective. For financial reporting purposes, the Fund offsets financial assets and financial liabilities that are subject to netting arrangements. In order for an arrangement to be eligible for netting, the Fund must have a basis to conclude that such netting arrangements are legally enforceable. The following table presents derivative instruments that are either subject to an enforceable netting agreement or offset by collateral arrangements as of December 31, 2014, net by contract:

Gross Amounts Not Offset in the

Statement of Financial Condition

Gross Amounts

Gross Amounts

Net Amounts

Financial

Cash Collateral

Net Amount

Recognized

Offset in the

Presented in

Instruments*

Pledged*

Statement of

the Statement of

Financial Condition

Financial Condition

Liabilities

Commodity Futures Contracts

$

(13,474,175

)

$

—

$

(13,474,175

)

$

—

$

13,474,175

$

—

The following table presents derivative instruments that are either subject to an enforceable netting agreement or offset by collateral arrangements as of December 31, 2013:

Gross Amounts Not Offset in the

Statement of Financial  Condition

Gross Amounts

Gross Amounts

Net Amounts

Financial

Cash Collateral

Net Amount

Recognized

Offset in the

Presented in the

Instruments*

Pledged*

Statement of

Statement of

Financial Condition

Financial Condition

Assets

Commodity Futures Contracts

$

4,657,800

$

(4,657,800

)

$

—

$

—

$

—

$

—

Liabilities

Commodity Futures Contracts

$

(8,707,688

)

$

4,657,800

$

(4,049,888

)

$

—

$

4,049,888

$

—

*

As of December 31, 2014 and December 31, 2013, a portion of the Fund’s cash and US Treasury Obligations were required to be deposited as margin in support of the Fund’s futures positions as described in Note 2.

The Managing Owner will utilize the cash held at the commodity broker to offset any realized losses incurred in the commodity futures contracts, if available. To the extent that cash held at the commodity broker is not adequate to cover any realized losses, a portion of the United States Treasury Bills will be sold to make additional cash available.

(j) Brokerage Commissions and Fees

The Fund incurs all brokerage commissions, including applicable exchange fees, National Futures Association (the “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. These costs are recorded as brokerage commissions and fees in the statement of income and expenses as incurred. 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 were less than $10.00 per round-turn trade for the Years Ended December 31, 2014, 2013 and 2012.

(k) Routine Operational, Administrative and Other Ordinary Expenses

Effective as of the Closing Date, the Managing Owner assumes 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. For purposes of the reporting period of this Form 10-K and up to the Closing Date, the Predecessor Managing Owner assumed all routine operational, administrative and other ordinary expenses of the Fund. Accordingly, all such expenses are not reflected in the statement of income and expenses of the Fund.

(l) Organizational and Offering Costs

Prior to the Closing Date, all organizational and offering expenses (including continuous offering expenses for the offering of the Shares) incurred by the Fund was assumed by the Predecessor Managing Owner. Effective as of the Closing Date, all offering expenses (including continuous offering expenses for the offering of the Shares) incurred by the Fund were assumed by the Managing Owner. The Fund is not responsible to either the Predecessor Managing Owner or the Managing Owner for the reimbursement of organizational and offering costs (including continuous offering expenses for the offering of the Shares).

(m) Non-Recurring Fees and Expenses

The Fund pays all non-recurring and unusual fees and expenses (referred to as extraordinary fees and expenses in the Trust Declaration), if any, of itself, as determined by the Managing Owner. Non-recurring and unusual fees and expenses are fees and expenses which are non-recurring and unusual in nature, such as legal claims and liabilities, litigation costs or indemnification or other unanticipated expenses. Such non-recurring and unusual fees and expenses, by their nature, are unpredictable in terms of timing and amount. For the Years Ended December 31, 2014, 2013 and 2012, the Fund did not incur such expenses.

Financial_Instrument_Risk

Financial Instrument Risk	12 Months Ended
	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Financial Instrument Risk	(5) 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. The financial instruments used by the Fund are commodity futures, 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 clearinghouse 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. CFTC regulations 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 statement 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.

Share_Purchases_and_Redemption

Share Purchases and Redemptions	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
Share Purchases and Redemptions	(6) Share Purchases and Redemptions
	(a) Purchases
	On any business day, an Authorized Participant may place an order with the Transfer Agent to create one or more Baskets. 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. As provided below, the creation order settlement date may occur up to 3 business days after the creation order date. By placing a creation order, and prior to delivery of such Baskets, an Authorized Participant’s 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 net asset value 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 3 business days after the creation order date. By placing a creation order, and prior to receipt of the Baskets, an Authorized Participant’s DTC account is charged the non-refundable transaction fee due for the creation order.
	Creation orders may be placed either (i) through the Continuous Net Settlement (“CNS”) clearing processes of the National Securities Clearing Corporation (the “NSCC”) or (ii) if outside the CNS Clearing Process, only through the facilities of The Depository Trust Company (“DTC” or the “Depository”) (the “DTC Process”), or a successor depository.
	(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. As provided below, the redemption order settlement date may occur up to 3 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 3 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.
	Redemption orders may be placed either (i) through the CNS clearing processes of the NSCC or (ii) if outside the CNS Clearing Process, only through the DTC Process, or a successor depository, and only in exchange for cash. 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 net asset value of the number of Basket(s) of the Fund 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.

Profit_and_Loss_Allocations_an

Profit and Loss Allocations and Distributions	12 Months Ended
	Dec. 31, 2014
Equity [Abstract]
Profit and Loss Allocations and Distributions	(7) Profit and Loss Allocations and Distributions
	Pursuant to the Trust Agreement, income and expenses are allocated pro rata to the Managing Owner as holder of the General Shares and to the Shareholders monthly based on their respective percentage interests as of the close of the last trading day of the preceding month. Distributions (other than redemption of units) may be made at the sole discretion of the Managing Owner on a pro rata basis in accordance with the respective capital balances of the shareholders.
	No distributions were paid for the Years Ended December 31, 2014, 2013, and 2012.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	(8) 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 which are in the best interests of the Fund. As of December 31, 2014 and 2013, no claims had been received by the Fund, further, the Fund has not had prior claims or losses pursuant to these contracts. Accordingly, the Managing Owner expects the risk of loss to be remote.

Net_Asset_Value_and_Financial_

Net Asset Value and Financial Highlights	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Net Asset Value and Financial Highlights	(9) Net Asset Value and Financial Highlights
	The Fund is presenting the following net asset value and financial highlights related to investment performance for a Share outstanding for the Years Ended December 31, 2014, 2013 and 2012. The net investment income and total expense ratios are calculated using average net asset value. The net asset value presentation is calculated using daily Shares outstanding. The total return is based on the change in net asset value of the Shares during the period. An individual investor’s return and ratios may vary based on the timing of capital transactions.
	Net asset value per Share is the net asset value of the Fund divided by the number of outstanding Shares at the date of each respective period presented.
		Year Ended			Year Ended			Year Ended
		December 31,			December 31,			December 31,
		2014			2013			2012
	Net Asset Value
	Net asset value per Share, beginning of period	$	16.78		$	19.13		$	18.72
	Net realized and change in unrealized gain (loss) on United States Treasury Obligations and Futures		(0.66	)		(2.23	)		0.55
	Net investment income (loss)		(0.13	)		(0.12	)		(0.14	)
	Net income (loss)		(0.79	)		(2.35	)		0.41
	Net asset value per Share, end of period	$	15.99		$	16.78		$	19.13
	Market value per Share, beginning of period	$	16.86		$	19.28		$	18.65
	Market value per Share, end of period	$	15.9		$	16.86		$	19.28
	Ratio to average Net Assets
	Net investment income (loss)		(0.75	)%		(0.72	)%		(0.71	)%
	Total expenses		0.78	%		0.77	%		0.78	%
	Total Return, at net asset value		(4.71	)%		(12.28	)%		2.19	%
	Total Return, at market value		(5.69	)%		(12.55	)%		3.38	%

Selected_Quarterly_Financial_D

Selected Quarterly Financial Data (Unaudited)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Selected Quarterly Financial Data (Unaudited)	(10) Selected Quarterly Financial Data (Unaudited)
		For the			For the			For the			For the
		Three Months Ended			Three Months Ended			Three Months Ended			Three Months Ended
		March 31, 2014			June 30, 2014			September 30, 2014			December 31, 2014
	Interest Income (loss)	$	29,815		$	23,696		$	20,937		$	11,728
	Net investment income (loss)	$	(485,714	)	$	(550,059	)	$	(655,538	)	$	(529,124	)
	Net realized and net change in unrealized gains/(losses) on United States Treasury Obligations and Futures	$	(15,479,196	)	$	20,723,503		$	369,314		$	(15,721,636	)
	Net Income/(loss)	$	(15,964,910	)	$	20,173,444		$	(286,224	)	$	(16,250,760	)
	Increase/(decrease) in Net Asset Value	$	69,412,508		$	11,272,157		$	13,869,666		$	(108,801,896	)
	Net Income (loss) per Share	$	(0.93	)	$	1.12		$	0.01		$	(0.99	)
		For the			For the			For the			For the
		Three Months Ended			Three Months Ended			Three Months Ended			Three Months Ended
		March 31, 2013			June 30, 2013			September 30, 2013			December 31, 2013
	Interest Income (loss)	$	51,226		$	45,001		$	24,000		$	18,048
	Net investment income (loss)	$	(578,111	)	$	(572,617	)	$	(512,838	)	$	(476,216	)
	Net realized and net change in unrealized gains/(losses) on United States Treasury Obligations and Futures	$	(27,899,315	)	$	(26,730,234	)	$	10,433,890		$	(566,484	)
	Net Income/(loss)	$	(28,477,426	)	$	(27,302,851	)	$	9,921,052		$	(1,042,700	)
	Increase/(decrease) in Net Asset Value	$	26,856,238		$	(26,515,433	)	$	(38,737,566	)	$	(36,686,707	)
	Net Income (loss) per Share	$	(1.59	)	$	(1.38	)	$	0.6		$	0.02

Subsequent_Events

Subsequent Events	12 Months Ended
	Dec. 31, 2014
Subsequent Events [Abstract]
Subsequent Events	(11) Subsequent Events
	See Note 1 above regarding the transaction under which DBCS agreed to transfer and sell to Invesco all of DBCS’ interest in the Fund, including the sole and exclusive power to direct the business and affairs of the Fund, as well as certain other assets pertaining to the management of the Fund, pursuant to the terms and conditions of a certain Asset Purchase Agreement.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2014

Accounting Policies [Abstract]

Basis of Presentation

(a) Basis of Presentation

The financial statements of the Fund have been prepared using U.S. generally accepted accounting principles (“U.S. GAAP”).

In June 2013, the Financial Accounting Standards Board (“FASB”) issued updated guidance clarifying the characteristics of an investment company and requiring new disclosures. Under the guidance, all entities regulated under the Investment Company Act of 1940 automatically qualify as investment companies, while all other entities need to consider both the fundamental and typical characteristics of an investment company in determining whether they qualify as investment companies. This new guidance is effective for interim or annual reporting periods that begin after December 15, 2013, and should be applied prospectively. The Fund adopted this guidance effective January 1, 2014. The Fund has determined that it meets the definition of an investment company and has prepared the financial statements in conformity with accounting and reporting guidance of the FASB Accounting Standards Codification Topic 946—Investment Companies, which is part of U.S. GAAP. The adoption of this guidance had no effect on the Fund’s statements of financial condition, including the schedule of investments, and the related statements of income and expenses, changes in shareholders’ equity and of cash flows.

In August 2014, the FASB issued a new standard, Accounting Standards Update No. 2014-15 Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern, which will explicitly require management to assess an entity’s ability to continue as a going concern and to provide related footnote disclosure in certain circumstances. This new guidance is effective for all entities in the first annual reporting period ending after December 15, 2016. The Fund is currently evaluating this guidance and its impact on the Fund’s financial statement disclosures.

Use of Estimates

(b) Use of Estimates

The preparation of the financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, revenues and expenses and related disclosure of contingent assets and liabilities during the reporting period of the financial statements and accompanying notes. Actual results could differ from those estimates. There were no significant estimates used in the preparation of these financial statements.

Financial Instruments and Fair Value

(c) Financial Instruments and Fair Value

United States Treasury Obligations and commodity futures contracts are recorded in the statements of financial condition on a trade date basis at fair value with changes in fair value recognized in earnings in each period. The fair value of a financial instrument is the amount 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 (the exit price). 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.

Financial Accounting Standards Board (FASB) Accounting Standards Codification fair value measurement and disclosure guidance requires a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets and liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy are described below:

Basis of Fair Value Measurement

Level 1:

Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities;

Level 2:

Quoted prices in markets that are not active or financial instruments for which all significant inputs are observable, either directly or indirectly;

Level 3:

Prices or valuations that require inputs that are both significant to the fair value measurement and unobservable.

A financial instrument’s level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement.

In determining fair value of United States Treasury Obligations, the Fund uses unadjusted quoted market prices in active markets. United States Treasury Obligations are classified within Level 1 of the fair value hierarchy. The Fund does not adjust the quoted prices for United States Treasury Obligations.

In determining fair value of LME commodity futures contracts, the Fund uses valuation pricing based on action of a committee that incorporates prices from the most liquid trading sessions of the day and can also rely on other inputs such as trades, bids and offers (including indicative bids and offers) transacted throughout the whole day. During the year ended December 31, 2013, management changed the classification of LME commodity futures from Level 1 to Level 2.

Assets and Liabilities Measured at Fair Value were as follows:

December 31, 2014

December 31, 2013

United States Treasury Obligations (Level 1)

$

236,994,724

$

227,989,243

Commodity Futures Contracts (Level 2)

$

(13,474,175

)

$

(4,049,888

)

There were no Level 3 holdings during the years ended December 31, 2014, 2013 and 2012. The Fund’s policy is to recognize transfers in and out of the valuation levels as of the end of the reporting period. Futures contracts in a net depreciation position of $4,049,888 were transferred from Level 1 to Level 2 during the year ended December 31, 2013 as described above.

Deposits with Commodity Broker

(d) Deposits with Commodity Broker

The Fund deposits cash and United States Treasury Obligations with its Commodity Broker subject to CFTC regulations and various exchange and Commodity 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 (variation margin) represents the Fund’s overall equity in its broker trading account. To meet the Fund’s initial margin requirements, the Fund holds United States Treasury Obligations. The Fund uses its cash held by the Commodity Broker to satisfy variation margin requirements. The Fund earns interest on its cash deposited with the Commodity Broker.

United States Treasury Obligations

(e) United States Treasury Obligations

The Fund records purchases and sales of United States Treasury Obligations on a trade date basis. These holdings are marked to market based on quoted market closing prices. The Fund holds United States Treasury Obligations for deposit with the Fund’s Commodity Broker to meet margin requirements and for trading purposes. Interest income is recognized on an accrual basis when earned. Premiums and discounts are amortized or accreted in interest income over the life of the United States Treasury Obligations. The Fund purchased $23,000,000 face amount of United States Treasury Obligations valued at $22,997,987 which was recorded as a payable for securities puchased as of December 31, 2014. The Fund purchased $3,000,000 face amount of United States Treasury Obligations valued at $2,999,507 which was recorded as a payable for securities purchased as of December 31, 2013.

Cash Held by Commodity Broker

(f) Cash Held by Commodity Broker

The Fund’s arrangement with the Commodity Broker requires the Fund to meet its variation margin requirement related to the price movements, both positive and negative, on futures contracts held by the Fund by keeping cash on deposit with the Commodity Broker. The Fund defines cash and cash equivalents to be highly liquid investments, with original maturities of three months or less when purchased. As of December 31, 2014 and 2013, the Fund had cash held with the Commodity Broker of $27,364,752 and $24,778,734, respectively. There were no cash equivalents held by the Fund as of December 31, 2014 and 2013.

Receivable/ (Payable) for LME Contracts

(g) Receivable/ (Payable) for LME Contracts

The Fund trades aluminum, copper and zinc commodity future contracts on the London Metals Exchange (“LME”). For settlement of futures contracts traded on the LME, cash is not transferred until the settled futures contracts expire. As of December 31, 2014 and 2013, the Fund had payables to the Commodity Broker for contracts on the LME $7,104,250 and $10,668,706, respectively, related to net realized losses on LME contracts which have been closed out but the contract is not yet expired.

Income Taxes

(h) Income Taxes

The Fund is classified as a partnership for U.S. federal income tax purposes. Accordingly, the Fund will 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.

Management of the Fund has reviewed all open tax years and major jurisdictions and concluded that there is no tax liability resulting from unrecognized tax benefits relating to uncertain income tax positions taken or expected to be taken in future tax returns. The Funds are 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. On an ongoing basis, management will monitor its tax positions taken under the interpretation (and consult with its tax counsel from time to time when appropriate) to determine if adjustments to conclusions are necessary based on factoring including, but not limited to, on-going analysis of tax law, regulation, and interpretations thereof. The major tax jurisdiction for the Fund and the earliest tax year subject to examination: United States, 2010.

Futures Contracts

(i) Futures Contracts

All commodity futures contracts are held and used for trading purposes. The commodity futures contracts are recorded on a trade date basis and open contracts are recorded in the statement of financial condition at fair value on the last business day of the period, which represents market value for those commodity futures for which market quotes are readily available. However, 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. Realized gains (losses) and changes in unrealized appreciation (depreciation) on open positions are determined on a specific identification basis and recognized in the statement of income and expenses in the period in which the contract is closed or the changes occur, respectively. For the years ended December 31, 2014 and 2013, the average notional market value of futures contracts held was $306.6 million and $304.7 million, respectively.

The Fair Value of Derivative Instruments as of December 31, 2014 is as follows:

Derivatives not Accounted for as Hedging Instruments

Statements of Financial Condition Location

Net Unrealized

Appreciation /

(Depreciation)

Commodity Futures Contracts

Net Unrealized Appreciation (Depreciation) on Futures Contracts

$

(13,474,175

)

The Fair Value of Derivative Instruments as of December 31, 2013 is as follows:

Derivatives not Accounted for as Hedging Instruments

Statements of Financial Condition Location

Net Unrealized

Appreciation /

(Depreciation)

Commodity Futures Contracts

Net Unrealized Appreciation (Depreciation) on Futures Contracts

$

(4,049,888

)

The Effect of Derivative Instruments on the Statements of Income and Expenses is as follows:

For the Year Ended

For the Year Ended

For the Year Ended

December 31, 2014

December 31, 2013

December 31, 2012

Derivatives not

Location of Gain or (Loss) on

Realized Gain

Change in

Realized Gain

Change in

Realized Gain

Change in

Accounted for as

Derivatives Recognized in Income

or (Loss) on

Unrealized  Gain

or (Loss) on

Unrealized Gain

or (Loss) on

Unrealized Gain

Hedging

Derivatives

or (Loss) on

Derivatives

or (Loss) on

Derivatives

or (Loss) on

Instruments

Recognized  in

Derivatives

Recognized in

Derivatives

Recognized in

Derivatives

Income

Recognized  in

Income

Recognized in

Income

Recognized in

Income

Income

Income

Commodity Futures Contracts

Net Realized Gain (Loss) on Futures

$

(684,350

)

—

$

(39,635,482

)

—

$

(84,992,271

)

—

Net Change in Unrealized Gain (Loss) on Futures

—

$

(9,424,287

)

—

$

(5,121,223

)

—

$

92,457,166

The Fund utilizes derivative instruments to achieve its investment objective. For financial reporting purposes, the Fund offsets financial assets and financial liabilities that are subject to netting arrangements. In order for an arrangement to be eligible for netting, the Fund must have a basis to conclude that such netting arrangements are legally enforceable. The following table presents derivative instruments that are either subject to an enforceable netting agreement or offset by collateral arrangements as of December 31, 2014, net by contract:

Gross Amounts Not Offset in the

Statement of Financial Condition

Gross Amounts

Gross Amounts

Net Amounts

Financial

Cash Collateral

Net Amount

Recognized

Offset in the

Presented in

Instruments*

Pledged*

Statement of

the Statement of

Financial Condition

Financial Condition

Liabilities

Commodity Futures Contracts

$

(13,474,175

)

$

—

$

(13,474,175

)

$

—

$

13,474,175

$

—

The following table presents derivative instruments that are either subject to an enforceable netting agreement or offset by collateral arrangements as of December 31, 2013:

Gross Amounts Not Offset in the

Statement of Financial  Condition

Gross Amounts

Gross Amounts

Net Amounts

Financial

Cash Collateral

Net Amount

Recognized

Offset in the

Presented in the

Instruments*

Pledged*

Statement of

Statement of

Financial Condition

Financial Condition

Assets

Commodity Futures Contracts

$

4,657,800

$

(4,657,800

)

$

—

$

—

$

—

$

—

Liabilities

Commodity Futures Contracts

$

(8,707,688

)

$

4,657,800

$

(4,049,888

)

$

—

$

4,049,888

$

—

*

As of December 31, 2014 and December 31, 2013, a portion of the Fund’s cash and US Treasury Obligations were required to be deposited as margin in support of the Fund’s futures positions as described in Note 2.

Brokerage Commissions and Fees

(j) Brokerage Commissions and Fees

The Fund incurs all brokerage commissions, including applicable exchange fees, National Futures Association (the “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. These costs are recorded as brokerage commissions and fees in the statement of income and expenses as incurred. 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 were less than $10.00 per round-turn trade for the Years Ended December 31, 2014, 2013 and 2012.

Routine Operational, Administrative and Other Ordinary Expenses

(k) Routine Operational, Administrative and Other Ordinary Expenses

Effective as of the Closing Date, the Managing Owner assumes 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. For purposes of the reporting period of this Form 10-K and up to the Closing Date, the Predecessor Managing Owner assumed all routine operational, administrative and other ordinary expenses of the Fund. Accordingly, all such expenses are not reflected in the statement of income and expenses of the Fund.

Organizational and Offering Costs

(l) Organizational and Offering Costs

Prior to the Closing Date, all organizational and offering expenses (including continuous offering expenses for the offering of the Shares) incurred by the Fund was assumed by the Predecessor Managing Owner. Effective as of the Closing Date, all offering expenses (including continuous offering expenses for the offering of the Shares) incurred by the Fund were assumed by the Managing Owner. The Fund is not responsible to either the Predecessor Managing Owner or the Managing Owner for the reimbursement of organizational and offering costs (including continuous offering expenses for the offering of the Shares).

Non-Recurring Fees and Expenses

(m) Non-Recurring Fees and Expenses

The Fund pays all non-recurring and unusual fees and expenses (referred to as extraordinary fees and expenses in the Trust Declaration), if any, of itself, as determined by the Managing Owner. Non-recurring and unusual fees and expenses are fees and expenses which are non-recurring and unusual in nature, such as legal claims and liabilities, litigation costs or indemnification or other unanticipated expenses. Such non-recurring and unusual fees and expenses, by their nature, are unpredictable in terms of timing and amount. For the Years Ended December 31, 2014, 2013 and 2012, the Fund did not incur such expenses.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2014

Accounting Policies [Abstract]

Assets and Liabilities Measured at Fair Value

Assets and Liabilities Measured at Fair Value were as follows:

December 31, 2014

December 31, 2013

United States Treasury Obligations (Level 1)

$

236,994,724

$

227,989,243

Commodity Futures Contracts (Level 2)

$

(13,474,175

)

$

(4,049,888

)

Fair Value of Derivative Instruments and Effect of Derivative Instruments on Statements of Income and Expenses

The Fair Value of Derivative Instruments as of December 31, 2014 is as follows:

Derivatives not Accounted for as Hedging Instruments

Statements of Financial Condition Location

Net Unrealized

Appreciation /

(Depreciation)

Commodity Futures Contracts

Net Unrealized Appreciation (Depreciation) on Futures Contracts

$

(13,474,175

)

The Fair Value of Derivative Instruments as of December 31, 2013 is as follows:

Derivatives not Accounted for as Hedging Instruments

Statements of Financial Condition Location

Net Unrealized

Appreciation /

(Depreciation)

Commodity Futures Contracts

Net Unrealized Appreciation (Depreciation) on Futures Contracts

$

(4,049,888

)

The Effect of Derivative Instruments on the Statements of Income and Expenses is as follows:

For the Year Ended

For the Year Ended

For the Year Ended

December 31, 2014

December 31, 2013

December 31, 2012

Derivatives not

Location of Gain or (Loss) on

Realized Gain

Change in

Realized Gain

Change in

Realized Gain

Change in

Accounted for as

Derivatives Recognized in Income

or (Loss) on

Unrealized  Gain

or (Loss) on

Unrealized Gain

or (Loss) on

Unrealized Gain

Hedging

Derivatives

or (Loss) on

Derivatives

or (Loss) on

Derivatives

or (Loss) on

Instruments

Recognized  in

Derivatives

Recognized in

Derivatives

Recognized in

Derivatives

Income

Recognized  in

Income

Recognized in

Income

Recognized in

Income

Income

Income

Commodity Futures Contracts

Net Realized Gain (Loss) on Futures

$

(684,350

)

—

$

(39,635,482

)

—

$

(84,992,271

)

—

Net Change in Unrealized Gain (Loss) on Futures

—

$

(9,424,287

)

—

$

(5,121,223

)

—

$

92,457,166

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 December 31, 2014, net by contract:

Gross Amounts Not Offset in the

Statement of Financial Condition

Gross Amounts

Gross Amounts

Net Amounts

Financial

Cash Collateral

Net Amount

Recognized

Offset in the

Presented in

Instruments*

Pledged*

Statement of

the Statement of

Financial Condition

Financial Condition

Liabilities

Commodity Futures Contracts

$

(13,474,175

)

$

—

$

(13,474,175

)

$

—

$

13,474,175

$

—

The following table presents derivative instruments that are either subject to an enforceable netting agreement or offset by collateral arrangements as of December 31, 2013:

Gross Amounts Not Offset in the

Statement of Financial  Condition

Gross Amounts

Gross Amounts

Net Amounts

Financial

Cash Collateral

Net Amount

Recognized

Offset in the

Presented in the

Instruments*

Pledged*

Statement of

Statement of

Financial Condition

Financial Condition

Assets

Commodity Futures Contracts

$

4,657,800

$

(4,657,800

)

$

—

$

—

$

—

$

—

Liabilities

Commodity Futures Contracts

$

(8,707,688

)

$

4,657,800

$

(4,049,888

)

$

—

$

4,049,888

$

—

*

As of December 31, 2014 and December 31, 2013, a portion of the Fund’s cash and US Treasury Obligations were required to be deposited as margin in support of the Fund’s futures positions as described in Note 2.

Net_Asset_Value_and_Financial_1

Net Asset Value and Financial Highlights (Tables)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Summary of Net Asset Value Per Share	Net asset value per Share is the net asset value of the Fund divided by the number of outstanding Shares at the date of each respective period presented.
		Year Ended			Year Ended			Year Ended
		December 31,			December 31,			December 31,
		2014			2013			2012
	Net Asset Value
	Net asset value per Share, beginning of period	$	16.78		$	19.13		$	18.72
	Net realized and change in unrealized gain (loss) on United States Treasury Obligations and Futures		(0.66	)		(2.23	)		0.55
	Net investment income (loss)		(0.13	)		(0.12	)		(0.14	)
	Net income (loss)		(0.79	)		(2.35	)		0.41
	Net asset value per Share, end of period	$	15.99		$	16.78		$	19.13
	Market value per Share, beginning of period	$	16.86		$	19.28		$	18.65
	Market value per Share, end of period	$	15.9		$	16.86		$	19.28
	Ratio to average Net Assets
	Net investment income (loss)		(0.75	)%		(0.72	)%		(0.71	)%
	Total expenses		0.78	%		0.77	%		0.78	%
	Total Return, at net asset value		(4.71	)%		(12.28	)%		2.19	%
	Total Return, at market value		(5.69	)%		(12.55	)%		3.38	%

Selected_Quarterly_Financial_D1

Selected Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Summary of Selected Quarterly Financial Data (Unaudited)	Selected Quarterly Financial Data (Unaudited)
		For the			For the			For the			For the
		Three Months Ended			Three Months Ended			Three Months Ended			Three Months Ended
		March 31, 2014			June 30, 2014			September 30, 2014			December 31, 2014
	Interest Income (loss)	$	29,815		$	23,696		$	20,937		$	11,728
	Net investment income (loss)	$	(485,714	)	$	(550,059	)	$	(655,538	)	$	(529,124	)
	Net realized and net change in unrealized gains/(losses) on United States Treasury Obligations and Futures	$	(15,479,196	)	$	20,723,503		$	369,314		$	(15,721,636	)
	Net Income/(loss)	$	(15,964,910	)	$	20,173,444		$	(286,224	)	$	(16,250,760	)
	Increase/(decrease) in Net Asset Value	$	69,412,508		$	11,272,157		$	13,869,666		$	(108,801,896	)
	Net Income (loss) per Share	$	(0.93	)	$	1.12		$	0.01		$	(0.99	)
		For the			For the			For the			For the
		Three Months Ended			Three Months Ended			Three Months Ended			Three Months Ended
		March 31, 2013			June 30, 2013			September 30, 2013			December 31, 2013
	Interest Income (loss)	$	51,226		$	45,001		$	24,000		$	18,048
	Net investment income (loss)	$	(578,111	)	$	(572,617	)	$	(512,838	)	$	(476,216	)
	Net realized and net change in unrealized gains/(losses) on United States Treasury Obligations and Futures	$	(27,899,315	)	$	(26,730,234	)	$	10,433,890		$	(566,484	)
	Net Income/(loss)	$	(28,477,426	)	$	(27,302,851	)	$	9,921,052		$	(1,042,700	)
	Increase/(decrease) in Net Asset Value	$	26,856,238		$	(26,515,433	)	$	(38,737,566	)	$	(36,686,707	)
	Net Income (loss) per Share	$	(1.59	)	$	(1.38	)	$	0.6		$	0.02

BackgroundOrganization_Additio

Background/Organization - Additional Information (Detail) (USD $)	12 Months Ended	0 Months Ended
	Dec. 31, 2014	Aug. 03, 2006	Dec. 31, 2013
	Basket
Organization [Line Items]
Purchase agreement transaction date	23-Feb-15
General Shares, shares issued	40		40
Number of shares in a basket	200,000
Fund offered common units to authorized participants in number of basket	1
PowerShares DB Base Metals Fund [Member]
Organization [Line Items]
Number of series of trust		7
Partners' capital contribution		$1,000
General Shares, shares issued		40

Fund_Investment_Overview_Addit

Fund Investment Overview - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Schedule of Investments [Abstract]
Deposits with broker	$250,885,301	$248,718,089
Percentage of assets held by broker	100.00%	100.00%
Restricted investments	$18,366,219	$19,456,837
Percentage of holdings considered restricted	7.30%	7.80%

Service_Providers_and_Related_1

Service Providers and Related Party Agreements - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Related Party Transaction [Line Items]
Management fee percentage per annum of daily net asset	0.75%
Management Fees	$2,219,818	$2,223,612	$2,559,969
Management Fees payable	130,925	150,010
Brokerage fees	86,793	54,445	100,099
Brokerage fees payable	4,635	4,797
Fund assets held by Administrator	0	0
Deutsche Bank Securities Inc [Member]
Related Party Transaction [Line Items]
Brokerage fees	86,793	54,445	100,099
Brokerage fees payable	$4,635	$4,797

Summary_of_Significant_Account3

Summary of Significant Accounting Policies - Assets and Liabilities Measured at Fair Value (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
United States Treasury Obligations (Level 1)	$236,994,724	$227,989,243
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
United States Treasury Obligations (Level 1)	236,994,724	227,989,243
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commodity Futures Contracts (Level 2)	($13,474,175)	($4,049,888)

Summary_of_Significant_Account4

Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Futures contracts in a net depreciation position transferred from Level 1 to Level 2		$4,049,888
Payable for securities purchased	22,997,987	2,999,507
Cash held with the Commodity Broker	27,364,752	24,778,734	34,696,647	126,742,986
Cash equivalents held	0	0
Cash and cash equivalents, original maturities, maximum number of months	3 months	3 months
Payable to the Commodity Broker for LME Contract	7,104,250	10,668,706
Unrecognized tax benefits	0
Average notional market value	306,600,000	304,700,000
Average charges paid to broker per round-turn trade, maximum	10	10	10
US Treasury Securities Purchased But Not Yet Paid [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Face amount of debt purchased	23,000,000	3,000,000
Payable for securities purchased	22,997,987	2,999,507
Level 3 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Assets and liabilities measured at fair value	$0	$0	$0

Summary_of_Significant_Account5

Summary of Significant Accounting Policies - Fair Value of Derivative Instruments and Effect of Derivative Instruments on Statements of Income and Expenses (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Net unrealized appreciation (depreciation) on futures contracts	($13,474,175)	($4,049,888)
Net Realized Gain (Loss) on Futures	-684,350	-39,635,482	-84,992,271
Net Change in Unrealized Gain (Loss) on Futures	($9,424,287)	($5,121,223)	$92,457,166

Summary_of_Significant_Account6

Summary of Significant Accounting Policies - Summary of Gross and Net Amounts of Offsetting Assets and Liabilities (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Offsetting [Abstract]
Gross Amounts of Recognized Liabilities	($13,474,175)	($8,707,688)
Gross Amount Offset Liabilities in the Statement of Financial Condition		4,657,800
Net Amounts of Liabilities Presented in the Statement of Financial Condition	-13,474,175	-4,049,888
Gross Amount Not Offset In The Statement of Financial Condition - Financial Instruments Liabilities	0	0
Gross Amount Not Offset In The Statement of Financial Condition - Cash Collateral Pledged Liabilities	13,474,175	4,049,888
Liabilities Net Amount	0	0
Gross Amounts of Recognized Assets		4,657,800
Gross Amounts Offset Assets in the Statement of Financial Condition Assets		-4,657,800
Net Amounts of Assets Presented in the Statement of Financial Condition		0
Gross Amounts Not Offset in the Statement of Financial Condition - Financial Instruments Assets		0
Gross Amounts Not Offset in the Statement of Financial Condition - Cash Collateral Pledged Assets		0
Assets Net Amount		$0

Share_Purchases_and_Redemption1

Share Purchases and Redemptions - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014
	Basket
Equity [Abstract]
Minimum number of Baskets that can be purchased	1
Minimum number of Baskets that can be redeemed	1
Shares Redeemed	200,000

Profit_and_Loss_Allocations_an1

Profit and Loss Allocations and Distributions - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share [Abstract]
Distributed Earnings	$0	$0

Commitments_and_Contingencies_

Commitments and Contingencies - Additional Information (Detail) (Indemnification Agreement [Member])	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
	LegalMatter	LegalMatter
Indemnification Agreement [Member]
Loss Contingencies [Line Items]
Claims received by fund	0	0

Net_Asset_Value_and_Financial_2

Net Asset Value and Financial Highlights - Summary of Net Asset Value Per Share (Detail) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net Asset Value
Net asset value per Share, beginning of period				$16.78				$19.13	$16.78	$19.13	$18.72
Net realized and change in unrealized gain (loss) on United States Treasury Obligations and Futures									($0.66)	($2.23)	$0.55
Net investment income (loss)									($0.13)	($0.12)	($0.14)
Net income (loss)	($0.99)	$0.01	$1.12	($0.93)	$0.02	$0.60	($1.38)	($1.59)	($0.79)	($2.35)	$0.41
Net asset value per Share, end of period	$15.99				$16.78				$15.99	$16.78	$19.13
Market value per Share, beginning of period				$16.86				$19.28	$16.86	$19.28	$18.65
Market value per Share, end of period	$15.90				$16.86				$15.90	$16.86	$19.28
Ratio to average Net Assets
Net investment income (loss)									-0.75%	-0.72%	-0.71%
Total expenses									0.78%	0.77%	0.78%
Total Return, at net asset value									-4.71%	-12.28%	2.19%
Total Return, at market value									-5.69%	-12.55%	3.38%

Selected_Quarterly_Financial_D2

Selected Quarterly Financial Data (Unaudited) - Summary of Selected Quarterly Financial Data (Unaudited) (Detail) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Interest Income (loss)	$11,728	$20,937	$23,696	$29,815	$18,048	$24,000	$45,001	$51,226	$86,176	$138,275	$230,197
Net investment income (loss)	-529,124	-655,538	-550,059	-485,714	-476,216	-512,838	-572,617	-578,111	-2,220,435	-2,139,782	-2,429,871
Net realized and net change in unrealized gains/(losses) on United States Treasury Obligations and Futures	-15,721,636	369,314	20,723,503	-15,479,196	-566,484	10,433,890	-26,730,234	-27,899,315	-10,108,015	-44,762,143	7,483,219
Net Income/(loss)	-16,250,760	-286,224	20,173,444	-15,964,910	-1,042,700	9,921,052	-27,302,851	-28,477,426	-12,328,450	-46,901,925	5,053,348
Increase/(decrease) in Net Asset Value	($108,801,896)	$13,869,666	$11,272,157	$69,412,508	($36,686,707)	($38,737,566)	($26,515,433)	$26,856,238
Net Income (loss) per Share	($0.99)	$0.01	$1.12	($0.93)	$0.02	$0.60	($1.38)	($1.59)	($0.79)	($2.35)	$0.41