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INVENTORIES - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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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