XML 231 R170.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Interests in Joint Operations - Summary of Significant Interests in Joint Operations (Detail) | 12 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Bass Strait Australia [member] |  |
Disclosure of significant joint operations [Line Items] |  |
Country of operation | Australia |
Principal activity | Hydrocarbons production |
Group interest | 50.00% | 50.00%
Greater Angostura Trinidad and Tobago [member] |  |
Disclosure of significant joint operations [Line Items] |  |
Country of operation | Trinidad and Tobago |
Principal activity | Hydrocarbons production |
Group interest | 45.00% | 45.00%
Gulf of Mexico United States [member] |  |
Disclosure of significant joint operations [Line Items] |  |
Country of operation | US |
Principal activity | Hydrocarbons exploration and production |
Gulf of Mexico United States [member] | Bottom of range [Member] |  |
Disclosure of significant joint operations [Line Items] |  |
Group interest | 23.90% | 23.90%
Gulf of Mexico United States [member] | Top of range [Member] |  |
Disclosure of significant joint operations [Line Items] |  |
Group interest | 44.00% | 44.00%
Macedon Australia [member] |  |
Disclosure of significant joint operations [Line Items] |  |
Country of operation | Australia |
Principal activity | Hydrocarbons exploration and production |
Group interest | 71.43% | 71.43%
North West Shelf Australia [member] |  |
Disclosure of significant joint operations [Line Items] |  |
Country of operation | Australia |
Principal activity | Hydrocarbons production |
North West Shelf Australia [member] | Bottom of range [Member] |  |
Disclosure of significant joint operations [Line Items] |  |
Group interest | 12.50% | 12.50%
North West Shelf Australia [member] | Top of range [Member] |  |
Disclosure of significant joint operations [Line Items] |  |
Group interest | 16.67% | 16.67%
Pyrenees Australia [member] |  |
Disclosure of significant joint operations [Line Items] |  |
Country of operation | Australia |
Principal activity | Hydrocarbons exploration and production |
Pyrenees Australia [member] | Bottom of range [Member] |  |
Disclosure of significant joint operations [Line Items] |  |
Group interest | 40.00% | 40.00%
Pyrenees Australia [member] | Top of range [Member] |  |
Disclosure of significant joint operations [Line Items] |  |
Group interest | 71.43% | 71.43%
ROD Integrated Development Algeria [member] |  |
Disclosure of significant joint operations [Line Items] |  |
Country of operation | Algeria |
Principal activity | Hydrocarbons exploration and production |
Group interest | 29.50% | 29.50%
Mt Goldsworthy Australia [member] |  |
Disclosure of significant joint operations [Line Items] |  |
Country of operation | Australia |
Principal activity | Iron ore mining |
Group interest | 85.00% | 85.00%
Mt Newmen Australia [member] |  |
Disclosure of significant joint operations [Line Items] |  |
Country of operation | Australia |
Principal activity | Iron ore mining |
Group interest | 85.00% | 85.00%
Yandi Australia [member] |  |
Disclosure of significant joint operations [Line Items] |  |
Country of operation | Australia |
Principal activity | Iron ore mining |
Group interest | 85.00% | 85.00%
Central Queensland Coal Associates Australia [member] |  |
Disclosure of significant joint operations [Line Items] |  |
Country of operation | Australia |
Principal activity | Coal mining |
Group interest | 50.00% | 50.00%

X
- Definition The description of the nature of the entity's operations and principal activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 138 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_138_b&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
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_DisclosureOfJointOperationsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The principal place of business of a joint operation. [Refer: Joint operations [member]; Principal place of business] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph 21 -Subparagraph a -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_21_a_iii&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_PrincipalPlaceOfBusinessOfJointOperation
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
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 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
- Details
Name: | ifrs-full_JointOperationsAxis=bhp_BassStraitAustraliaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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

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

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

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

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

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

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