Schedules of Investments (Unaudited) - Investments (Details)	Jun. 30, 2019 USD ($) oz	Mar. 31, 2019 USD ($) oz	Dec. 31, 2018 USD ($) oz	Jun. 30, 2018 USD ($) oz	Mar. 31, 2018 USD ($) oz	Dec. 31, 2017 USD ($) oz
Silver bullion (Ounce) | oz	323,330,613	309,301,232	317,233,610	322,465,714	319,012,097	320,629,662
Investment in silver bullion, cost	$ 5,667,962,993	$ 5,475,186,353	$ 5,641,558,156	$ 5,806,008,238	$ 5,786,442,301	$ 5,831,748,196
Silver bullion fair value	4,921,091,926		4,906,017,787
Less Liabilities	(1,951,420)		(1,981,164)
Net Assets	$ 4,919,140,506	$ 4,668,431,637	$ 4,904,036,623	$ 5,166,953,607	$ 5,191,290,570	$ 5,405,193,851