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Subsequent Event - Additional Information (Detail) - Subsequent Event	Apr. 27, 2020 t
Subsequent Event [Line Items]
Gold held in vault other measures	45.91
Percentage of trust gold held in vault	4.40%

X

- Definition

Gold held in vault other measures.

+ References

No definition available.

+ Details

Name:	gld_GoldHeldInVaultOtherMeasures
Namespace Prefix:	gld_
Data Type:	num:massItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of trust gold held in vault.

+ References

No definition available.

+ Details

Name:	gld_PercentageOfTrustGoldHeldInVault
Namespace Prefix:	gld_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: