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FINANCIAL INSTRUMENTS Narrative (Details) - Credit Facility Due 2026 [Member] $ in Billions	May 30, 2021 USD ($)
Disclosure of detailed information about borrowings [line items]
Notional amount	$ 3.0
Borrowings, adjustment to interest rate basis	1.125%
Line of credit, standby rate	0.11%

X

- Definition

Line of credit, standby rate

+ References

No definition available.

+ Details

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Namespace Prefix:	abx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The adjustment to the basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 7
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_7&doctype=Standard
-URIDate 2020-01-01

+ Details

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Namespace Prefix:	ifrs-full_
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Balance Type:	na
Period Type:	instant

X

- 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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X

- Definition

The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2020-01-01

+ Details

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Balance Type:	na
Period Type:	instant

X

- Details

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Namespace Prefix:
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Period Type: