XML 147 R87.htm IDEA: XBRL DOCUMENT
v3.19.1

ACQUISITIONS AND DIVESTITURES - Narrative (Details) shares in Thousands, $ in Thousands |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 03, 2019 USD ($) shares | Sep. 24, 2018 USD ($) | May 09, 2018 USD ($) shares | Dec. 01, 2017 USD ($) shares | Jun. 09, 2017 USD ($) | Apr. 06, 2017 USD ($) | Mar. 28, 2017 | Dec. 31, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Oct. 02, 2018 shares | Sep. 30, 2017 USD ($) | Jun. 07, 2017 USD ($) shares
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration received |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 990,000 |  |  |
Goodwill (note 20b) |  |  |  |  |  |  |  | $ 1,330,000 |  |  | $ 1,176,000 | 1,330,000 |  |  |
Decrease in non-controlling interest (note 4b) |  |  |  |  |  |  |  |  |  |  |  | $ (493,000) |  |  |
Robertson Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash transferred |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 16,000
Number of shares issued (shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,150
Value of shares issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000
Veladero |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest sold |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |
Proportion of ownership in joint operation |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |
Cerro Casale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest sold |  |  |  |  | 25.00% |  | 25.00% |  |  |  | 25.00% |  |  |  |
Gains (losses) recognised when control of subsidiary is lost |  |  |  |  |  |  |  |  | $ 193,000 |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |
Proportion of ownership in joint operation |  |  |  |  | 50.00% |  |  |  |  |  | 50.00% |  |  |  |
Implied fair value from consideration received in deconsolidation |  |  |  |  | $ 1,200,000 |  |  |  |  |  |  |  |  |  |
Impairment loss (reversal of loss) |  |  |  |  |  |  |  |  |  | $ 1,120,000 |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |
Shandong |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration paid (received) |  | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of equity interests acquired (shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  | 120,000 |  |
Shandong | Veladero |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest sold |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |
Cash consideration received |  |  |  |  |  | $ 990,000 |  |  |  |  |  |  |  |  |
Working capital adjustment |  |  |  |  |  |  |  | $ 30,000 |  |  |  |  |  |  |
Gains (losses) recognised when control of subsidiary is lost |  |  |  |  |  | $ 718,000 |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |
Goodwill (note 20b) |  |  |  |  |  |  |  |  |  |  | $ 154,000 |  |  |  |
Goldcorp | Cerro Casale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest sold |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |
Decrease in non-controlling interest (note 4b) |  |  |  |  | $ 260,000 |  |  |  |  |  |  |  |  |  |
Divestiture consideration, investment commitment |  |  |  |  | 520,000 |  |  |  |  |  |  |  |  |  |
Divestiture consideration, minimum payments of project expenditures in first 2 years |  |  |  |  | 60,000 |  |  |  |  |  |  |  |  |  |
Divestiture consideration, minimum payments of project expenditures in successive 2 year periods |  |  |  |  | $ 80,000 |  |  |  |  |  |  |  |  |  |
Funding commitment interest rate |  |  |  |  | 475.00% |  |  |  |  |  |  |  |  |  |
Divestiture consideration, percent of cash payment of shortfall if minimum project expenditures not met in 2 year period |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |
Goldcorp | Cerro Casale | Quebrada Seca Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration received |  |  |  |  | $ 40,000 |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |
Royalty percent receivable on 25% of the gross revenues from metal production |  |  |  |  | 1.25% |  |  |  |  |  |  |  |  |  |
Percentage of Gross Revenue Subject to Royalty |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |
Goldcorp | Cerro Casale | Exeter Resource Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Divestiture consideration, investment commitment |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 520,000 |
Percentage of voting equity interests acquired |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |
Total acquisition cost |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 157,000 |
Receivables recognised in a business combination |  |  |  |  |  |  |  |  |  |  |  |  |  | 163,000 |
Kinross | Cerro Casale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest sold |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |
Short Term [Member] | Goldcorp | Cerro Casale | Exeter Resource Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Receivables recognised in a business combination |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000 |
Long Term [Member] | Goldcorp | Cerro Casale | Exeter Resource Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Receivables recognised in a business combination |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 143,000 |
Midas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  | 19.90% |  |  |  |  |  |  |  |  |  |  |  |
Number of equity interests acquired (shares) | shares |  |  | 46,550 |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire interest in other investments |  |  | $ 38,000 |  |  |  |  |  |  |  |  |  |  |  |
Reunion Gold Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired | 1990.00% |  |  | 15.00% |  |  |  |  |  |  |  |  |  |  |
Number of equity interests acquired (shares) | shares | 33,200 |  |  | 48,000 |  |  |  |  |  |  |  |  |  |  |
Payments to acquire interest in other investments | $ 4,970 |  |  | $ 9,000 |  |  |  |  |  |  |  |  |  |  |

X
- Definition Business Combination, Provisional Information, Initial Accounting Incomplete, Working Capital Adjustment + References No definition available. + Details
Name: | abx_BusinessCombinationProvisionalInformationInitialAccountingIncompleteWorkingCapitalAdjustment
Namespace Prefix: | abx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Divestiture, Consideration, Investment Commitment + References No definition available. + Details
Name: | abx_DivestitureConsiderationInvestmentCommitment
Namespace Prefix: | abx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Divestiture, Consideration, Minimum Payments of Project Expenditures in First Two Years + References No definition available. + Details
Name: | abx_DivestitureConsiderationMinimumPaymentsofProjectExpendituresinFirstTwoYears
Namespace Prefix: | abx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Divestiture, Consideration, Minimum Payments of Project Expenditures in Successive Two Year Periods + References No definition available. + Details
Name: | abx_DivestitureConsiderationMinimumPaymentsofProjectExpendituresinSuccessiveTwoYearPeriods
Namespace Prefix: | abx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Divestiture, Consideration, Payments of Development Project Expenditures + References No definition available. + Details
Name: | abx_DivestitureConsiderationPaymentsofDevelopmentProjectExpenditures
Namespace Prefix: | abx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Divestiture, Consideration, Percent of Cash Payment of Shortfall if Minimum Project Expenditures Not Met in Two Year Period + References No definition available. + Details
Name: | abx_DivestitureConsiderationPercentofCashPaymentofShortfallifMinimumProjectExpendituresNotMetinTwoYearPeriod
Namespace Prefix: | abx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Implied Fair Value from Consideration Received in Deconsolidation + References No definition available. + Details
Name: | abx_ImpliedFairValuefromConsiderationReceivedinDeconsolidation
Namespace Prefix: | abx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Interest Rate, Funding Commitment + References No definition available. + Details
Name: | abx_InterestRateFundingCommitment
Namespace Prefix: | abx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of equity interests acquired + References No definition available. + Details
Name: | abx_Numberofequityinterestsacquired
Namespace Prefix: | abx_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Payments to Acquire Interest in Other Investments + References No definition available. + Details
Name: | abx_PaymentstoAcquireInterestinOtherInvestments
Namespace Prefix: | abx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percentage of Gross Revenue Subject to Royalty + References No definition available. + Details
Name: | abx_PercentageofGrossRevenueSubjecttoRoyalty
Namespace Prefix: | abx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Proportion of ownership interest sold + References No definition available. + Details
Name: | abx_ProportionofOwnershipInterestSold
Namespace Prefix: | abx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Receivables recognised in a business combination + References No definition available. + Details
Name: | abx_Receivablesrecognisedinabusinesscombination
Namespace Prefix: | abx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Royalty Percent on 25 Percent of the Gross Revenues From Metal Production + References No definition available. + Details
Name: | abx_RoyaltyPercenton25PercentoftheGrossRevenuesFromMetalProduction
Namespace Prefix: | abx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The fair value, at acquisition date, of the consideration transferred in a business combination. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B64 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_f&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
Name: | ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The fair value, at acquisition date, of cash transferred as consideration in a business combination. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B64 -Subparagraph f -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_f_i&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
Name: | ifrs-full_CashTransferred
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of consideration paid or received in respect of both obtaining and losing control of subsidiaries or other businesses. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 40 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_40_a&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_ConsiderationPaidReceived
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Definition The fair value, at the acquisition date, of equity interests of the acquirer transferred as consideration in a business combination. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B64 -Subparagraph f -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_f_iv&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
Name: | ifrs-full_EquityInterestsOfAcquirer
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The gains (losses) recognised in association with the loss of control over a subsidiary, which are attributable to the former controlling interest. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph 19 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_19&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_GainsLossesRecognisedWhenControlInSubsidiaryIsLost
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B67 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B67_d&doctype=Appendix&seq=2 -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2018-01-01 -Paragraph 134 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_134_a&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2018-01-01 -Paragraph 135 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_135_a&doctype=Standard -URIDate 2018-03-16 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_c&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_Goodwill
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The number of instruments or interests issued or issuable at acquisition date for equity interests of the acquirer transferred as consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B64 -Subparagraph f -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_f_iv&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
Name: | ifrs-full_NumberOfInstrumentsOrInterestsIssuedOrIssuable
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of voting equity interests acquired in a business combination. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B64 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_c&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
Name: | ifrs-full_PercentageOfVotingEquityInterestsAcquired
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The portion of consideration paid or received, consisting of cash and cash equivalents, in respect of both obtaining and losing control of subsidiaries or other businesses. [Refer: Subsidiaries [member]; Cash and cash equivalents; Consideration paid (received)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 40 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_40_b&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_PortionOfConsiderationPaidReceivedConsistingOfCashAndCashEquivalents
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The proportion of ownership interest in a joint operation attributable to the entity. [Refer: Joint operations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph 21 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_21_a_iv&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_ProportionOfOwnershipInterestInJointOperation
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2018-01-01 -Paragraph 17 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2018-03-01&anchor=para_17_b_iii&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2018-01-01 -Paragraph 16 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2018-03-01&anchor=para_16_b_iii&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph 19B -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_19B_c&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_ProportionOfOwnershipInterestInSubsidiary
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount recognised as an increase of the carrying amount of an asset or cash-generating unit to its recoverable amount when an impairment loss had been previously recognised. [Refer: Impairment loss] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2018-01-01 -Paragraph 130 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_130_b&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2018-01-01 -Paragraph 130 -Subparagraph d -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_130_d_ii&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_ReversalOfImpairmentLoss
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | ifrs-full_BusinessCombinationsAxis=abx_RobertsonPropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_JointOperationsAxis=abx_VeladeroMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_JointOperationsAxis=abx_CerroCasaleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | abx_CounterpartyAxis=abx_ShandongGoldGroupCoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | abx_CounterpartyAxis=abx_GoldcorpIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BusinessCombinationsAxis=abx_QuebradaSecaPropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BusinessCombinationsAxis=abx_ExeterResourceCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | abx_CounterpartyAxis=abx_GoldcorpofKinrossGoldCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | abx_BSLocation3Axis=abx_ShortTermMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | abx_BSLocation3Axis=abx_LongTermMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | invest_InvestmentAxis=abx_MidasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | invest_InvestmentAxis=abx_ReunionGoldCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |