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INVENTORIES - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Inventories [Abstract]
Purchase obligation for supplies and consumables	$ 1,882	$ 1,681

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- Definition

Inventories [Abstract]

+ References

No definition available.

+ Details

Name:	abx_InventoriesAbstract
Namespace Prefix:	abx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Purchase obligation1

+ References

No definition available.

+ Details

Name:	abx_PurchaseObligation1
Namespace Prefix:	abx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant