Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2018	Jun. 30, 2018
Document Information [Line Items]
Entity Registrant Name	ISHARES GOLD TRUST
Entity Central Index Key	0001278680
Trading Symbol	iau
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	Yes
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding (in shares)	940,200,000
Entity Public Float		$ 9,189,173,407
Document Type	10-K
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Shell Company	false