Document And Entity Information - Jun. 30, 2015 - shares	Total
Document and Entity Information [Abstract]
Entity Registrant Name	iShares Gold Trust
Trading Symbol	iau
Document Type	10-Q
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding	558,050,000
Amendment Flag	false
Entity Central Index Key	0001278680
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Well-known Seasoned Issuer	Yes
Document Period End Date	Jun. 30, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q2