Dividends reinvested by owners

No definition available.

Name:	abx_DividendsReinvestedbyOwners
Namespace Prefix:	abx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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

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

- Definition

The cash outflow for dividends paid by the entity, classified as financing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 7
-IssueDate 2018-01-01
-Paragraph 31
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_31&doctype=Standard
-URIDate 2018-03-16

+ Details

Name:	ifrs-full_DividendsPaidClassifiedAsFinancingActivities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount of dividends recognised as distributions to owners of the parent. [Refer: Parent [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 106
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_106_d&doctype=Standard
-URIDate 2018-03-16

+ Details

Name:	ifrs-full_DividendsRecognisedAsDistributionsToOwnersOfParent
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The number of shares issued by the entity.

+ References

+ Details

Name:	ifrs-full_NumberOfSharesIssued
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The nominal value per share.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 79
-Subparagraph a
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_79_a_iii&doctype=Standard
-URIDate 2018-03-16

+ Details

Name:	ifrs-full_ParValuePerShare
Namespace Prefix:	ifrs-full_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	ifrs-full_ClassesOfShareCapitalAxis=ifrs-full_OrdinarySharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ComponentsOfEquityAxis=ifrs-full_IssuedCapitalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=abx_RandgoldMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=abx_AcaciaMiningPLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

CAPITAL STOCK (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Sep. 17, 2019	Jan. 02, 2019
Disclosure of classes of share capital [line items]
Dividends recognised as distributions to owners of parent	$ 218	$ 199
Dividends paid, classified as financing activities	548	125
Dividends reinvested	$ 0
Common shares
Disclosure of classes of share capital [line items]
Par value per share (in dollars per share)	$ 0
Capital stock
Disclosure of classes of share capital [line items]
Dividends reinvested	$ 20	$ 14
Randgold \| Common shares
Disclosure of classes of share capital [line items]
Number of shares issued (shares)				583,669,178
Acacia Mining PLC [Member]
Disclosure of classes of share capital [line items]
Number of shares issued (shares)			24,836,670
Acacia Mining PLC [Member] \| Common shares
Disclosure of classes of share capital [line items]
Number of shares issued (shares)				24,836,670