Schedules of Investments - Investments (Details)	Dec. 31, 2018 USD ($) oz	Dec. 31, 2017 USD ($) oz	Dec. 31, 2016 USD ($) oz	Dec. 31, 2015 USD ($) oz
Gold bullion (Ounce) | oz	9,009,541	7,828,465	6,308,062	4,905,568
Investment in gold bullion, cost	$ 11,255,129,376	$ 9,663,574,842	$ 7,706,923,343	$ 5,910,175,908
Gold bullion fair value	11,547,078,166	10,149,604,427
Less Liabilities	(2,340,020)	(2,097,290)
Net Assets	$ 11,544,738,146	$ 10,147,507,137	$ 7,310,131,020	$ 5,209,802,846