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Balance Sheets (Parentheticals) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Investment in gold bullion, cost $ 6,254,868us-gaap_InvestmentOwnedAtCost [1] $ 6,272,422us-gaap_InvestmentOwnedAtCost
Gold bullion inventory, fair value   $ 6,272,422iau_GoldBullionInventoryFairValue
Redeemable capital Shares, par value      
Shares issued 535,400,000us-gaap_TemporaryEquitySharesIssued 538,000,000us-gaap_TemporaryEquitySharesIssued
[1] Effective January 1, 2014, the Trust qualifies as an investment company for accounting purposes. Disclosure of a schedule of investments is required for investment companies. Please refer to Note 2B.