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SIGNIFICANT ACCOUNTING POLICIES - Post-Retirement Benefits (Details) | 12 Months Ended
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Dec. 31, 2020
Officers |
Disclosure of defined benefit plans [line items] |
Employer matching contribution, percent of salary | 15.00%

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- Definition Defined benefit plans, employer matching contribution, percent of employees' gross pay + References No definition available. + Details
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Namespace Prefix: | abx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | abx_ClassofemployeeAxis=abx_Officer1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |