Investments in Affiliates (Tables)

6 Months Ended

Jun. 30, 2019

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

Summary of Transactions in, and Earnings from, Investments in Affiliates (Excluding Affiliated Money Market Funds)

The following is a summary of the transactions in, and earnings from, investments in affiliates (excluding affiliated money market funds) for the three and six months ended June 30, 2019.

	Value 03/31/2019		Purchases at Cost		Proceeds from Sales		Change in Unrealized Appreciation (Depreciation)		Realized Gain (Loss)		Value 06/30/2019		Dividend Income
Invesco Treasury Collateral ETF	$	79,855,930	$	—	$	—	$	79,485	$	—	$	79,935,415	$	478,954
	Value 12/31/2018		Purchases at Cost		Proceeds from Sales		Change in Unrealized Appreciation (Depreciation)		Realized Gain (Loss)		Value 06/30/2019		Dividend Income
Invesco Treasury Collateral ETF	$	79,818,080	$	—	$	—	$	117,335	$	—	$	79,935,415	$	940,140

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 six months ended June 30, 2018.

	Value 03/31/2018		Purchases at Cost		Proceeds from Sales		Change in Unrealized Appreciation (Depreciation)		Realized Gain (Loss)		Value 06/30/2018		Dividend Income
Invesco Treasury Collateral ETF	$	79,999,760	$	—	$	—	$	325,510	$	—	$	80,325,270	$	—
	Value 12/31/2017		Purchases at Cost		Proceeds from Sales		Change in Unrealized Appreciation (Depreciation)		Realized Gain (Loss)		Value 06/30/2018		Dividend Income
Invesco Treasury Collateral ETF	$	79,689,390	$	—	$	—	$	635,880	$	—	$	80,325,270	$	—