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Discontinued Operations - Summary of Impairment of Non-current Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Disclosure of analysis of single amount of discontinued operations [line items]
Impairment charges	$ (264)	$ (333)	$ (193)
Impairment of Onshore US assets [member]
Disclosure of analysis of single amount of discontinued operations [line items]
Impairment charges		(2,859)
Impairment of Onshore US assets [member] | Property, plant and equipment [member]
Disclosure of analysis of single amount of discontinued operations [line items]
Impairment charges		(520)
Impairment of Onshore US assets [member] | Goodwill and other intangibles [member]
Disclosure of analysis of single amount of discontinued operations [line items]
Impairment charges		(2,339)
Impairment of Onshore US assets [member] | Petrohawk [member]
Disclosure of analysis of single amount of discontinued operations [line items]
Impairment charges		(2,253)
Impairment of Onshore US assets [member] | Petrohawk [member] | Goodwill and other intangibles [member]
Disclosure of analysis of single amount of discontinued operations [line items]
Impairment charges		(2,253)
Impairment of Onshore US assets [member] | Fayetteville [member]
Disclosure of analysis of single amount of discontinued operations [line items]
Impairment charges		(606)
Impairment of Onshore US assets [member] | Fayetteville [member] | Property, plant and equipment [member]
Disclosure of analysis of single amount of discontinued operations [line items]
Impairment charges		(520)
Impairment of Onshore US assets [member] | Fayetteville [member] | Goodwill and other intangibles [member]
Disclosure of analysis of single amount of discontinued operations [line items]
Impairment charges		$ (86)

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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.

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- 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 2018-01-01
-Paragraph 130
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_130_b&doctype=Standard
-URIDate 2018-03-16

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 36
-IssueDate 2018-01-01
-Paragraph 130
-Subparagraph d
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_130_d_ii&doctype=Standard
-URIDate 2018-03-16

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