Schedules of Investments (Unaudited) - Investments (Details)	Sep. 30, 2018 USD ($) oz	Jun. 30, 2018 USD ($) oz	Dec. 31, 2017 USD ($) oz	Sep. 30, 2017 USD ($) oz	Jun. 30, 2017 USD ($) oz	Dec. 31, 2016 USD ($) oz
Gold bullion (Ounce) | oz	8,603,326	8,637,702	7,828,465	7,348,395	6,762,892	6,308,062
Investment in gold bullion, cost	$ 10,751,660,254	$ 10,806,316,895	$ 9,663,574,842	$ 9,047,063,229	$ 8,277,677,317	$ 7,706,923,343
Gold bullion fair value	10,214,299,135		10,149,604,427
Less Liabilities	(2,102,113)		(2,097,290)
Net Assets	$ 10,212,197,022		$ 10,147,507,137			$ 7,310,131,020