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Discontinued Operations - Summary of Impairment of Non-current Assets (Detail) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |
Impairment charges | $ (494) | $ (264) | $ (333)
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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