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Discontinued Operations - Summary of Impairment of Non-current Assets (Detail) - USD ($)
$ in Millions
 12 Months Ended
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)