Investments in Affiliates (Tables)

6 Months Ended

Jun. 30, 2017

Investments In And Advances To Affiliates Schedule Of Investments [Abstract]

Summary of Transactions in, and Earnings from, Investments in PowerShares Treasury Collateral Portfolio

The following is a summary of the transactions in, and earnings from, investments in PowerShares Treasury Collateral Portfolio for the Three and Six Months Ended June 30, 2017.

	Value 04/01/2017		Purchases at Cost		Proceeds from Sales		Change in Unrealized Appreciation (Depreciation)		Realized Gain (Loss)		Value 06/30/2017		Dividend Income
PowerShares Treasury    Collateral Portfolio	$	250,074,684	$	—	$	—	$	450,756	$	—	$	250,525,440	$	—

	Value 01/01/2017		Purchases at Cost		Proceeds from Sales		Change in Unrealized Appreciation (Depreciation)		Realized Gain (Loss)		Value 06/30/2017		Dividend Income
PowerShares Treasury    Collateral Portfolio	$	—	$	249,990,226	$	—	$	535,214	$	—	$	250,525,440	$	—