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Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Cash Flows from Operating Activities          
Proceeds from silver bullion sold to pay expenses     $ 19,636,834 $ 21,537,444  
Expenses – Sponsor’s fees paid     (19,636,834) (21,537,444)  
Net cash provided by operating activities     0 0  
Increase (decrease) in cash     0 0  
Cash, beginning of period     0 0 $ 0
Cash, end of period $ 0 $ 0 0 0 0
Reconciliation of Net Increase (Decrease) in Net Assets Resulting from Operations to Net Cash Provided by (Used in) Operating Activities          
Net increase (decrease) in net assets resulting from operations (570,271,220) 138,466,960 (838,453,972) 216,479,005 217,471,048
Adjustments to reconcile net increase (decrease) in net assets resulting from operations to net cash provided by (used in) operating activities:          
Proceeds from silver bullion sold to pay expenses     19,636,834 21,537,444  
Net realized (gain) loss 25,667,793 32,819,015 68,160,375 60,929,703 92,120,817
Net change in unrealized appreciation/depreciation $ 538,368,056 $ (178,415,473) 750,921,945 (298,932,277) $ (337,891,452)
Change in operating assets and liabilities:          
Sponsor’s fees payable     (265,182) (13,875)  
Net cash provided by operating activities     0 0  
Supplemental disclosure of non-cash information:          
Silver bullion contributed for Shares issued     880,252,487 649,149,108  
Silver bullion distributed for Shares redeemed     $ (684,717,667) $ (899,979,662)