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SEGMENT INFORMATION - Narrative (Details) | Dec. 31, 2020 minesite
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Operating Segments [Abstract] |
Number of minesites | 18
Number of investments | 1
Number of gold mines | 10

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- Definition Number of gold mines + References No definition available. + Details
Name: | abx_NumberOfGoldMines
Namespace Prefix: | abx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of investments + References No definition available. + Details
Name: | abx_NumberofInvestments
Namespace Prefix: | abx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of minesite locations + References No definition available. + Details
Name: | abx_NumberofMinesiteLocations
Namespace Prefix: | abx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Operating Segments [Abstract] + References No definition available. + Details
Name: | abx_OperatingSegmentsAbstract
Namespace Prefix: | abx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration