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Statements of Financial Condition (Parenthetical) - $ / shares
Dec. 31, 2020
Dec. 31, 2019
Statement Of Financial Position [Abstract]    
Redeemable Capital Shares, no par value
Redeemable Capital Shares, shares authorized 156,500,000 146,500,000
Redeemable Capital Shares, shares issued 2,850,000 2,700,000
Redeemable Capital Shares, shares outstanding 2,850,000 2,700,000