Fund Investment Overview	3 Months Ended
Mar. 31, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Fund Investment Overview	(3) Fund Investment Overview The Fund seeks to track changes, whether positive or negative, in the level of the DBIQ Optimum Yield Diversified Commodity Index Excess Return^TM (the “Index”) over time, plus the excess, if any, of the sum of the Fund’s interest income from its holdings of United States Treasury Obligations (“Treasury Income”), dividends from its holdings in money market mutual funds (affiliated or otherwise) (“Money Market Income”) and dividends or distributions of capital gains from its holdings of T-Bill ETFs (as defined below) (“T-Bill ETF Income”) over the expenses of the Fund. The Fund gains an exposure to United States Treasury Obligations through an investment in exchange-traded funds (affiliated or otherwise) that track indexes that measure the performance of United States Treasury Obligations with a maximum remaining maturity of up to 12 months (“T-Bill ETFs”). For the avoidance of doubt, the Fund invests in futures contracts in an attempt to track its Index. The Fund holds United States Treasury Obligations, money market mutual funds (affiliated or otherwise) and T-Bill ETFs (affiliated or otherwise), if any, for margin and/or cash management purposes only. The Index is intended to reflect the change in market value of the commodity sector. The commodities comprising the Index are Light Sweet Crude Oil, Ultra Low Sulphur Diesel (also commonly known as Heating Oil), Aluminum, Gold, Corn, Wheat, Brent Crude Oil, Copper Grade A, Natural Gas, RBOB Gasoline (reformulated gasoline blendstock for oxygen blending, or “RBOB”), Silver, Soybeans, Sugar and Zinc (the “Index Commodities”). Certain Index Commodities are currently trading on the London Metals Exchange (the “LME”). Although the LME does not currently impose position limits on these Index Commodities, the LME may in the future impose position limits on market participants trading in certain commodities included in the Index. The Commodity Futures Trading Commission (the “CFTC”) and/or commodity exchanges, as applicable, impose position limits on market participants trading in certain commodities included in the Index. The Index is comprised of futures contracts on the Index Commodities that expire in a specific month and trade on a specific exchange (the “Index Contracts”). 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 a certain Index Commodity by investing in a specific Index Contract that is part of the Index, the Fund may invest in a futures contract referencing the particular Index Commodity other than the specific contract that comprises the Index or, in the alternative, invest in other futures contracts not based on the particular Index Commodity if, in the commercially reasonable judgment of the Managing Owner, such futures contracts tend to exhibit trading prices that correlate with a futures contract that comprises the Index. Should the Fund approach or reach position limits with respect to certain futures contracts comprising the Index, the Fund will commence investing in other futures contracts based on commodities that comprise the Fund’s Index and in futures contracts based on commodities other than commodities that comprise the Fund’s Index.

(3) Fund Investment Overview

The Fund seeks to track changes, whether positive or negative, in the level of the DBIQ Optimum Yield Diversified Commodity Index Excess Return^TM (the “Index”) over time, plus the excess, if any, of the sum of the Fund’s interest income from its holdings of United States Treasury Obligations (“Treasury Income”), dividends from its holdings in money market mutual funds (affiliated or otherwise) (“Money Market Income”) and dividends or distributions of capital gains from its holdings of T-Bill ETFs (as defined below) (“T-Bill ETF Income”) over the expenses of the Fund. The Fund gains an exposure to United States Treasury Obligations through an investment in exchange-traded funds (affiliated or otherwise) that track indexes that measure the performance of United States Treasury Obligations with a maximum remaining maturity of up to 12 months (“T-Bill ETFs”). For the avoidance of doubt, the Fund invests in futures contracts in an attempt to track its Index. The Fund holds United States Treasury Obligations, money market mutual funds (affiliated or otherwise) and T-Bill ETFs (affiliated or otherwise), if any, for margin and/or cash management purposes only.

The Index is intended to reflect the change in market value of the commodity sector. The commodities comprising the Index are Light Sweet Crude Oil, Ultra Low Sulphur Diesel (also commonly known as Heating Oil), Aluminum, Gold, Corn, Wheat, Brent Crude Oil, Copper Grade A, Natural Gas, RBOB Gasoline (reformulated gasoline blendstock for oxygen blending, or “RBOB”), Silver, Soybeans, Sugar and Zinc (the “Index Commodities”).

Certain Index Commodities are currently trading on the London Metals Exchange (the “LME”). Although the LME does not currently impose position limits on these Index Commodities, the LME may in the future impose position limits on market participants trading in certain commodities included in the Index.

The Commodity Futures Trading Commission (the “CFTC”) and/or commodity exchanges, as applicable, impose position limits on market participants trading in certain commodities included in the Index. The Index is comprised of futures contracts on the Index Commodities that expire in a specific month and trade on a specific exchange (the “Index Contracts”). 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 a certain Index Commodity by investing in a specific Index Contract that is part of the Index, the Fund may invest in a futures contract referencing the particular Index Commodity other than the specific contract that comprises the Index or, in the alternative, invest in other futures contracts not based on the particular Index Commodity if, in the commercially reasonable judgment of the Managing Owner, such futures contracts tend to exhibit trading prices that correlate with a futures contract that comprises the Index.

Should the Fund approach or reach position limits with respect to certain futures contracts comprising the Index, the Fund will commence investing in other futures contracts based on commodities that comprise the Fund’s Index and in futures contracts based on commodities other than commodities that comprise the Fund’s Index.