XML 189 R121.htm IDEA: XBRL DOCUMENT
v3.8.0.1

IMPAIRMENT AND REVERSAL OF NON-CURRENT ASSETS - Narrative (Details) |  |  | 3 Months Ended | 5 Months Ended | 6 Months Ended | 7 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 09, 2017 USD ($) | Mar. 28, 2017 USD ($) | Dec. 31, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Dec. 31, 2015 USD ($) | May 31, 2016 | Dec. 31, 2017 USD ($) | Jun. 30, 2017 | Dec. 31, 2016 USD ($) $ / pound | Dec. 31, 2017 USD ($) $ / pound $ / ounce | Dec. 31, 2016 USD ($) $ / ounce | Sep. 30, 2017 USD ($)
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment (reversals) charges |  |  |  |  |  |  |  |  |  |  |  | $ (212,000,000) | $ (250,000,000) |
Estimated change in WACC (as percent) |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |
Cerro Casale |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss (reversal of loss) |  |  |  | $ (1,120,000,000) |  |  |  |  |  |  |  |  |  |
Implied fair value from consideration received in deconsolidation |  | $ 1,200,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Non-current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment (reversals) charges |  |  |  |  |  |  |  |  |  |  |  | $ (224,000,000) | (250,000,000) |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment (reversals) charges |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |
Zaldívar |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Economic interest in subsidiary |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |
Zaldívar | Individual assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recoverable amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 950,000,000
Zaldívar | Non-current assets | Individual assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment (reversals) charges |  |  |  |  |  | $ 49,000,000 |  |  |  |  |  |  |  |
Zaldívar | Goodwill | Individual assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment (reversals) charges |  |  |  |  |  | $ 427,000,000 |  |  |  |  |  |  |  |
Bulyanhulu |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated change in WACC (as percent) |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |
Bulyanhulu | Individual assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment (reversals) charges |  |  |  |  |  |  |  |  |  |  |  | $ 740,000,000 | 0 |
Veladero | Individual assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment (reversals) charges |  |  | $ (259,000,000) |  |  |  |  |  |  |  |  |  |  |
Recoverable amount |  |  | 747,000,000 |  | 1,600,000,000 |  |  |  | $ 747,000,000 |  | $ 1,600,000,000 | 747,000,000 | 1,600,000,000 |
Veladero | Non-current assets | Individual assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment (reversals) charges |  |  |  |  | $ (275,000,000) |  |  |  |  |  |  |  |  |
Lagunas Norte | Individual assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment (reversals) charges |  |  |  |  |  |  |  |  |  |  |  | 3,000,000 | (28,000,000) |
Recoverable amount |  |  |  |  |  |  | $ 630,000,000 |  |  |  |  |  |  |
Lagunas Norte | Non-current assets | Individual assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment (reversals) charges |  |  |  |  |  |  | $ (28,000,000) |  |  |  |  |  |  |
Pascua-Lama | Individual assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment (reversals) charges |  |  |  |  |  |  |  |  |  |  |  | 407,000,000 | $ 0 |
Pascua-Lama | Non-current assets | Individual assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment (reversals) charges |  |  | (429,000,000) |  |  |  |  |  |  |  |  |  |  |
Recoverable amount |  |  | 850,000,000 |  |  |  |  |  | 850,000,000 |  |  | $ 850,000,000 |  |
Copper |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty tax rate |  |  |  |  |  |  |  | 15.00% |  |  |  |  |  |
Estimated change in mineral price (gold, in dollars per ounce; copper, in dollars per pound) | $ / pound |  |  |  |  |  |  |  |  |  |  |  | 0.25 |  |
Gold |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated mineral price in year two and more measurement of fair value less costs of disposal | $ / ounce |  |  |  |  |  |  |  |  |  |  |  |  | 1,200 |
Estimated change in mineral price (gold, in dollars per ounce; copper, in dollars per pound) | $ / ounce |  |  |  |  |  |  |  |  |  |  |  | 100 |  |
Gold | Bulyanhulu |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated change in mineral price (gold, in dollars per ounce; copper, in dollars per pound) | $ / ounce |  |  |  |  |  |  |  |  |  |  |  | 100 |  |
Acacia Mining PLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Economic interest in subsidiary |  |  |  |  |  |  |  |  |  |  |  | 63.90% |  |
Acacia Mining PLC | Bulyanhulu | Non-current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment (reversals) charges |  |  | (740,000,000) |  |  |  |  |  |  |  |  | $ 0 |  |
Recoverable amount |  |  | $ 600,000,000 |  |  |  |  |  | $ 600,000,000 |  |  | $ 600,000,000 |  |
Recoverable amount of asset or cash generating unit, percent of asset basis |  |  | 100.00% |  |  |  |  |  | 100.00% |  |  | 100.00% |  |
Pascua-Lama |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated change in mineral price used in current measurement of fair value less cost of disposal (as a percent) |  |  | (10.00%) |  |  |  |  |  | (10.00%) |  |  | (10.00%) |  |
Pueblo Viejo |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Economic interest in subsidiary |  |  |  |  |  |  |  |  |  |  |  | 60.00% |  |
Cerro Casale |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest sold | 25.00% | 25.00% |  |  |  |  |  |  |  |  |  | 25.00% |  |
Proportion of ownership in joint operation | 50.00% |  |  |  |  |  |  |  |  |  |  | 50.00% |  |
Implied fair value from consideration received in deconsolidation | $ 1,200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Economic interest in subsidiary | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Price Range One | Copper |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty tax rate |  |  |  |  |  |  |  |  |  |  | 4.00% |  |  |
Copper price | $ / pound |  |  |  |  |  |  |  |  |  |  | 2.04 |  |  |
Price Range Two | Copper |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty tax rate |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |
Price Range Three | Copper |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty tax rate |  |  |  |  |  |  |  |  |  |  | 6.00% |  |  |
Copper price | $ / pound |  |  |  |  |  |  |  |  |  |  | 2.72 |  |  |
Minimum | Lumwana | Non-current assets | Individual assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment (reversals) charges |  |  |  |  |  |  |  |  |  |  |  | $ (303,000,000) |  |
Minimum | Price Range Two | Copper |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Copper price | $ / pound |  |  |  |  |  |  |  |  |  |  | 2.04 |  |  |
Maximum | Price Range Two | Copper |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Copper price | $ / pound |  |  |  |  |  |  |  |  |  |  | 2.72 |  |  |
$100 Decrease in Gold Price | Gold | Bulyanhulu |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment (reversals) charges |  |  |  |  |  |  |  |  |  |  |  | 172,000,000 |  |
$100 Decrease in Gold Price | Gold | Lagunas Norte |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment (reversals) charges |  |  |  |  |  |  |  |  |  |  |  | (311,000) |  |
$100 Decrease in Gold Price | Pueblo Viejo | Gold |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment (reversals) charges |  |  |  |  |  |  |  |  |  |  |  | (651,000) |  |
$100 Decrease in Gold Price | Pueblo Viejo | Gold | Non-current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment (reversals) charges |  |  |  |  |  |  |  |  |  |  |  | 425,000,000 |  |
$100 Increase in Gold Price | Gold | Bulyanhulu |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment (reversals) charges |  |  |  |  |  |  |  |  |  |  |  | (172,000,000) |  |
$100 Increase in Gold Price | Gold | Bulyanhulu | Non-current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment (reversals) charges |  |  |  |  |  |  |  |  |  |  |  | 63,000,000 |  |
$100 Increase in Gold Price | Pueblo Viejo | Gold |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment (reversals) charges |  |  |  |  |  |  |  |  |  |  |  | 546,000 |  |
Cash-generating units | Bulyanhulu |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value |  |  | $ 600,000,000 |  |  |  |  |  | $ 600,000,000 |  |  | 600,000,000 |  |
Cash-generating units | Lumwana |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value |  |  | 849,000,000 |  |  |  |  |  | 849,000,000 |  |  | 849,000,000 |  |
Cash-generating units | Lagunas Norte |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value |  |  | 458,000,000 |  |  |  |  |  | 458,000,000 |  |  | 458,000,000 |  |
Cash-generating units | Pascua-Lama |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value |  |  | 38,000,000 |  |  |  |  |  | 38,000,000 |  |  | 38,000,000 |  |
Cash-generating units | Pueblo Viejo |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value |  |  | 3,077,000,000 |  |  |  |  |  | 3,077,000,000 |  |  | 3,077,000,000 |  |
Cash-generating units | At fair value | Pascua-Lama |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value |  |  | $ 750,000,000 |  |  |  |  |  | $ 750,000,000 |  |  | $ 750,000,000 |  | $ 850,000,000
Tax contingent liability | Tanzanian Revenue Authority Assessment | Acacia Mining PLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty tax rate |  |  |  |  |  |  |  |  | 4.00% | 6.00% |  |  |  |
Clearing fee on minerals exported |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |

X
- Definition Clearing Fee On Minerals Exported + References No definition available. + Details
Name: | abx_ClearingFeeOnMineralsExported
Namespace Prefix: | abx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Estimated change in discount rate used In current measurement of fair value less costs of disposal + References No definition available. + Details
Name: | abx_EstimatedChangeinDiscountRateUsedInCurrentMeasurementOfFairValueLessCostsOfDisposal
Namespace Prefix: | abx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Estimated change in mineral price used In current measurement of fair value less costs of disposal + References No definition available. + Details
Name: | abx_EstimatedChangeinMineralPriceUsedInCurrentMeasurementOfFairValueLessCostsOfDisposal
Namespace Prefix: | abx_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition Estimated Change in Mineral Price Used in Current Measurement Of Fair Value Less Cost of Disposal, Percent + References No definition available. + Details
Name: | abx_EstimatedChangeinMineralPriceUsedinCurrentMeasurementOfFairValueLessCostofDisposalPercent
Namespace Prefix: | abx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Estimated mineral price in year two and more measurement of fair value less costs cf disposal + References No definition available. + Details
Name: | abx_EstimatedMineralPriceinYearTwoandMoreMeasurementOfFairValueLessCostsOfDisposal
Namespace Prefix: | abx_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

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 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 Recoverable Amount of Asset or Cash Generating Unit, Percent of Asset Basis + References No definition available. + Details
Name: | abx_RecoverableAmountofAssetorCashGeneratingUnitPercentofAssetBasis
Namespace Prefix: | abx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Royalty Tax Rate + References No definition available. + Details
Name: | abx_RoyaltyTaxRate
Namespace Prefix: | abx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Royalty Tax Rate, Price + References No definition available. + Details
Name: | abx_RoyaltyTaxRatePrice
Namespace Prefix: | abx_
Data Type: | xbrli:decimalItemType
Balance Type: | na
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_DisclosureOfInformationForEachMaterialImpairmentLossRecognisedOrReversedForIndividualAssetOrCashgeneratingUnitLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount recognised as a reduction of the carrying amount of an asset or cash-generating unit to its recoverable amount. [Refer: Carrying amount [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 130 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_130_b&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 130 -Subparagraph d -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_130_d_ii&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_ImpairmentLoss
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of impairment loss, impairment gain or reversal of impairment loss that is recognised in profit or loss in accordance with paragraph 5.5.8 of IFRS 9 and that arises from applying the impairment requirements in Section 5.5 of IFRS 9. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 82 -Subparagraph ba -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_82_ba&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_ImpairmentLossImpairmentGainAndReversalOfImpairmentLossDeterminedInAccordanceWithIFRS9
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of intangible assets assessed as having an indefinite useful life. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 122 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_122_a&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 134 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_134_b&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 135 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_135_b&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_IntangibleAssetsWithIndefiniteUsefulLife
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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 2017-01-01 -Paragraph 21 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_21_a_iv&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 17 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2017-03-01&anchor=para_17_b_iii&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2017-01-01 -Paragraph 16 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2017-03-01&anchor=para_16_b_iii&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph 19B -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_19B_c&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_ProportionOfOwnershipInterestInSubsidiary
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The higher of an asset’s (or cash-generating unit’s) fair value less costs of disposal and its value in use. [Refer: Cash-generating units [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 130 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_130_e&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_RecoverableAmountOfAssetOrCashgeneratingUnit
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Details
Name: | ifrs-full_ClassesOfAssetsAxis=ifrs-full_NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSaleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfAssetsAxis=ifrs-full_GoodwillMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | abx_NameofPropertyAxis=abx_ZaldivarMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_IndividualAssetsOrCashgeneratingUnitsAxis=ifrs-full_IndividualAssetsOrCashgeneratingUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | abx_NameofPropertyAxis=abx_BulyanhuluMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | ifrs-full_SegmentsAxis=abx_LagunasNorteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=abx_PascuaLamaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=abx_CopperMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=abx_GoldMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=abx_PascuaLamaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=abx_PuebloViejoMember
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_PriceRangeAxis=abx_PriceRangeOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | abx_PriceRangeAxis=abx_PriceRangeTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | abx_PriceRangeAxis=abx_PriceRangeThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | abx_NameofPropertyAxis=abx_LumwanaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | abx_PriceChangeAssumptionAxis=abx_A100DecreaseinGoldPriceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | abx_PriceChangeAssumptionAxis=abx_A100IncreaseinGoldPriceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis=ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MeasurementAxis=ifrs-full_AtFairValueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfContingentLiabilitiesAxis=ifrs-full_TaxContingentLiabilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ItemsOfContingentLiabilitiesAxis=abx_TanzanianRevenueAuthorityAssessmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |