Investments in Affiliates (Tables)

9 Months Ended

Sep. 30, 2018

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

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

The following is a summary of the transactions in, and earnings from, investments in affiliates (excluding affiliated money market mutual funds) for the three and nine months ended September 30, 2018.

	Value 06/30/2018		Purchases at Cost		Proceeds from Sales		Change in Unrealized Appreciation (Depreciation)			Realized Gain (Loss)		Value 09/30/2018		Dividend Income
Invesco Treasury Collateral ETF	$	16,118,109	$	—	$	—	$	(100,254	)	$	—	$	16,017,855	$	178,414

	Value 12/31/2017		Purchases at Cost		Proceeds from Sales		Change in Unrealized Appreciation (Depreciation)		Realized Gain (Loss)		Value 09/30/2018		Dividend Income
Invesco Treasury Collateral ETF	$	15,990,513	$	—	$	—	$	27,342	$	—	$	16,017,855	$	178,414

The following is a summary of the transactions in, and earnings from, investments in affiliates (excluding affiliated money market mutual funds) for the three and nine months ended September 30, 2017.

	Value 06/30/2017		Purchases at Cost		Proceeds from Sales		Change in Unrealized Appreciation (Depreciation)		Realized Gain (Loss)		Value 09/30/2017		Dividend Income
PowerShares Treasury Collateral Portfolio	$	16,040,640	$	—	$	—	$	37,975	$	—	$	16,078,615	$	—

	Value 12/31/2016		Purchases at Cost		Proceeds from Sales		Change in Unrealized Appreciation (Depreciation)		Realized Gain (Loss)		Value 09/30/2017		Dividend Income
PowerShares Treasury Collateral Portfolio	$	—	$	16,006,371	$	—	$	72,244	$	—	$	16,078,615	$	—