Schedules of Investments (Unaudited) (Details) - Investments (Parentheticals)	Mar. 31, 2015	Dec. 31, 2014
Investments [Abstract]
Total Investment, Percentage of Net Asset Value	100.02%	100.02%
Less Liabilities, Percentage of Net Asset Value	(0.02%)	(0.02%)
Net Assets, Percentage of Net Asset Value	100.00%iau_NetAssetsPercentageOfNetAssets	100.00%iau_NetAssetsPercentageOfNetAssets

Percent of net assets at close of period. For schedules of investments that are categorized, each category has a percent of net assets for the aggregated value of the Investments in the category.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 12C

-Paragraph 2

-Article 12

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 320

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-12.3)

-URI http://asc.fasb.org/extlink&oid=34726532&loc=d3e611133-123010

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 320

-Section S99

-Paragraph 4

-Subparagraph (SX 210.12-12C.Column D.2)

-URI http://asc.fasb.org/extlink&oid=34726532&loc=d3e611225-123010

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 12

-Paragraph 3

-Article 12

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 12C

-Paragraph Column D

-Article 12

Name:	us-gaap_InvestmentOwnedPercentOfNetAssets
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant