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Discontinued Operations - Summary of Impairment of Non-current Assets (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Disclosure of discontinued operations [line items] |  |  |
Impairment charges | $ (333) | $ (193) | $ (186)
Impairment of Onshore US assets [member] |  |  |
Disclosure of discontinued operations [line items] |  |  |
Impairment charges | (2,859) |  |
Impairment of Onshore US assets [member] | Property, plant and equipment [member] |  |  |
Disclosure of discontinued operations [line items] |  |  |
Impairment charges | (520) |  |
Impairment of Onshore US assets [member] | Goodwill and other intangibles [member] |  |  |
Disclosure of discontinued operations [line items] |  |  |
Impairment charges | (2,339) |  |
Impairment of Onshore US assets [member] | Petrohawk [member] |  |  |
Disclosure of discontinued operations [line items] |  |  |
Impairment charges | (2,253) |  |
Impairment of Onshore US assets [member] | Petrohawk [member] | Goodwill and other intangibles [member] |  |  |
Disclosure of discontinued operations [line items] |  |  |
Impairment charges | (2,253) |  |
Impairment of Onshore US assets [member] | Fayetteville [member] |  |  |
Disclosure of discontinued operations [line items] |  |  |
Impairment charges | (606) |  |
Impairment of Onshore US assets [member] | Fayetteville [member] | Property, plant and equipment [member] |  |  |
Disclosure of discontinued operations [line items] |  |  |
Impairment charges | (520) |  |
Impairment of Onshore US assets [member] | Fayetteville [member] | Goodwill and other intangibles [member] |  |  |
Disclosure of discontinued operations [line items] |  |  |
Impairment charges | $ (86) |  |

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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 2017-01-01 -Paragraph 130 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_130_b&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 130 -Subparagraph d -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_130_d_ii&doctype=Standard -URIDate 2017-03-09 + Details
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