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Consolidated Statements of Cash Flow (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Statement of cash flows [abstract]
Income taxes payable settled against VAT receivables	$ 203	$ 115

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- Definition

Income taxes payable settled against VAT receivables

+ References

No definition available.

+ Details

Name:	abx_IncomeTaxesPayableSettledAgainstVATReceivables
Namespace Prefix:	abx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	ifrs-full_StatementOfCashFlowsAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration