| Document And Entity Information | Jul. 08, 2019 |
| Document Information [Line Items] | |
| Entity Registrant Name | iShares Gold Trust |
| Document Type | 8-K |
| Document Period End Date | Jul. 8, 2019 |
| Entity Incorporation, State or Country Code | NY |
| Entity File Number | 001-32418 |
| Entity Tax Identification Number | 81-6124036 |
| Entity Address, Address Line One | 400 Howard Street |
| Entity Address, City or Town | San Francisco |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 94105 |
| City Area Code | 415 |
| Local Phone Number | 670-2000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Shares |
| Trading Symbol | IAU |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Entity Ex Transition Period | false |
| Amendment Flag | false |
| Entity Central Index Key | 0001278680 |
