Schedules of Investments (Unaudited) - Investments (Details)	Jun. 30, 2018 USD ($) oz	Mar. 31, 2018 USD ($) oz	Dec. 31, 2017 USD ($) oz	Jun. 30, 2017 USD ($) oz	Mar. 31, 2017 USD ($) oz	Dec. 31, 2016 USD ($) oz
Gold bullion (Ounce) | oz	8,637,702	8,725,190	7,828,465	6,762,892	6,425,460	6,308,062
Investment in gold bullion, cost	$ 10,806,316,895	$ 10,859,308,652	$ 9,663,574,842	$ 8,277,677,317	$ 7,847,423,443	$ 7,706,923,343
Gold bullion fair value	10,801,014,832		10,149,604,427
Less Liabilities	(2,348,296)		(2,097,290)
Net Assets	$ 10,798,666,536		$ 10,147,507,137			$ 7,310,131,020