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Interests in Joint Operations - Summary of Significant Interests in Joint Operations (Detail) | 12 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Bass Strait Australia [member] |  |
Disclosure of significant joint operations [line items] |  |
Country of operation | Australia |
Principal activity | Hydrocarbons production |
Group's 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's 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's interest | 23.90% | 23.90%
Gulf of Mexico United States [member] | Top of range [member] |  |
Disclosure of significant joint operations [line items] |  |
Group's 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's 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's interest | 12.50% | 12.50%
North West Shelf Australia [member] | Top of range [member] |  |
Disclosure of significant joint operations [line items] |  |
Group's 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's interest | 40.00% | 40.00%
Pyrenees Australia [member] | Top of range [member] |  |
Disclosure of significant joint operations [line items] |  |
Group's 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's 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's 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's 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's 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's interest | 50.00% | 50.00%

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- 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 2018-01-01 -Paragraph 138 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_138_b&doctype=Standard -URIDate 2018-03-16 + Details
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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
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- 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 2018-01-01 -Paragraph 21 -Subparagraph a -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_21_a_iii&doctype=Standard -URIDate 2018-03-16 + Details
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- 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
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