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Interests in Joint Operations - Summary of Significant Interests in Joint Operations (Detail)	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Atlantis [member]
Disclosure of significant joint operations [line items]
Country of operation	US
Principal activity	Hydrocarbons production
Group's interest	44.00%	44.00%
Bass Strait [member]
Disclosure of significant joint operations [line items]
Country of operation	Australia
Principal activity	Hydrocarbons production
Group's interest	50.00%	50.00%
Macedon [member]
Disclosure of significant joint operations [line items]
Country of operation	Australia
Principal activity	Hydrocarbons production
Group's interest	71.43%	71.43%
Mad Dog [member]
Disclosure of significant joint operations [line items]
Country of operation	US
Principal activity	Hydrocarbons production
Group's interest	23.90%	23.90%
North West Shelf [member]
Disclosure of significant joint operations [line items]
Country of operation	Australia
Principal activity	Hydrocarbons production
North West Shelf [member] | Bottom of range [member]
Disclosure of significant joint operations [line items]
Group's interest	12.50%	12.50%
North West Shelf [member] | Top of range [member]
Disclosure of significant joint operations [line items]
Group's interest	16.67%	16.67%
Pyrenees [member]
Disclosure of significant joint operations [line items]
Country of operation	Australia
Principal activity	Hydrocarbons production
Pyrenees [member] | Bottom of range [member]
Disclosure of significant joint operations [line items]
Group's interest	40.00%	40.00%
Pyrenees [member] | Top of range [member]
Disclosure of significant joint operations [line items]
Group's interest	71.43%	71.43%
ROD Integrated Development [member]
Disclosure of significant joint operations [line items]
Country of operation	Algeria
Principal activity	Hydrocarbons production
Group's interest	28.85%	29.50%
Shenzi [member]
Disclosure of significant joint operations [line items]
Country of operation	US
Principal activity	Hydrocarbons production
Group's interest	72.00%	44.00%
Trinidad/Tobago [member]
Disclosure of significant joint operations [line items]
Country of operation	Trinidad and Tobago
Principal activity	Hydrocarbons production
Trinidad/Tobago [member] | Bottom of range [member]
Disclosure of significant joint operations [line items]
Group's interest	45.00%	45.00%
Trinidad/Tobago [member] | Top of range [member]
Disclosure of significant joint operations [line items]
Group's interest	68.46%	68.46%
Mt Goldsworthy [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 Newman [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 [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 [member]
Disclosure of significant joint operations [line items]
Country of operation	Australia
Principal activity	Coal mining
Group's 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 2020-01-01
-Paragraph 138
-Subparagraph b
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-URIDate 2020-01-01

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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 2020-01-01
-Paragraph 21
-Subparagraph a
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_21_a_iii&doctype=Standard
-URIDate 2020-01-01

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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 2020-01-01
-Paragraph 21
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-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_21_a_iv&doctype=Standard
-URIDate 2020-01-01

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