XML 141 R81.htm IDEA: XBRL DOCUMENT
v3.19.1

SIGNIFICANT ACCOUNTING POLICIES - Estimated Useful Lives of Major Asset Categories (Details) | 12 Months Ended
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Dec. 31, 2018
Minimum | Buildings, plant and equipment |
Disclosure of detailed information about property, plant and equipment [line items] |
Useful life | P2Y
Minimum | Underground mobile equipment |
Disclosure of detailed information about property, plant and equipment [line items] |
Useful life | P4Y
Minimum | Light vehicles and other mobile equipment |
Disclosure of detailed information about property, plant and equipment [line items] |
Useful life | P2Y
Minimum | Furniture, computer and office equipment |
Disclosure of detailed information about property, plant and equipment [line items] |
Useful life | P1Y
Maximum | Buildings, plant and equipment |
Disclosure of detailed information about property, plant and equipment [line items] |
Useful life | P29Y
Maximum | Underground mobile equipment |
Disclosure of detailed information about property, plant and equipment [line items] |
Useful life | P7Y
Maximum | Light vehicles and other mobile equipment |
Disclosure of detailed information about property, plant and equipment [line items] |
Useful life | P10Y
Maximum | Furniture, computer and office equipment |
Disclosure of detailed information about property, plant and equipment [line items] |
Useful life | P10Y

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

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- Definition The useful lives or depreciation rates used for property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2018-01-01 -Paragraph 73 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_c&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_UsefulLivesOrDepreciationRatesPropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_BuildingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=abx_UndergroundMobileEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=abx_LightVehiclesandOtherMobileEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=abx_FurnitureComputerandOfficeEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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