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Discontinued Operations - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jul. 27, 2018
Jan. 01, 2018
Dec. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Disclosure of discontinued operations [line items]            
Total comprehensive income (loss) attributable to BHP shareholders       $ 3,608 $ 5,841 $ (6,360)
US corporate tax rate       30.00% 30.00% 30.00%
Taxation (income) charges related to exceptional items       $ (2,320) $ (243) $ (247)
Exceptional gain (loss), after tax       2,970 1,006 2,767
US tax reform [Member]            
Disclosure of discontinued operations [line items]            
US corporate tax rate   21.00% 35.00%      
Taxation (income) charges related to exceptional items       (2,320)    
Exceptional gain (loss), after tax       2,320    
Impairment of Onshore US assets [member]            
Disclosure of discontinued operations [line items]            
Exceptional gain (loss), after tax           4,884
Discontinued Operations - Onshore US Cash Generating Units [Member]            
Disclosure of discontinued operations [line items]            
Goodwill         3,022  
Discontinued operations [member]            
Disclosure of discontinued operations [line items]            
Total comprehensive income (loss) attributable to BHP shareholders       (2,943) $ (489) (5,846)
Taxation (income) charges related to exceptional items       601   2,300
Exceptional gain (loss), after tax       2,258   4,884
Discontinued operations [member] | US tax reform [Member]            
Disclosure of discontinued operations [line items]            
Taxation (income) charges related to exceptional items       492    
Exceptional gain (loss), after tax       (492)    
Discontinued operations [member] | Impairment of Onshore US assets [member]            
Disclosure of discontinued operations [line items]            
Taxation (income) charges related to exceptional items       109   2,300
Exceptional gain (loss), after tax       $ 2,750   $ 4,884
Announcement of plan to discontinue operation [member] | Discontinued Operations - Onshore US Cash Generating Units [Member]            
Disclosure of discontinued operations [line items]            
Agreement purchase price $ 10,800          
Announcement of plan to discontinue operation [member] | Petrohawk [member]            
Disclosure of discontinued operations [line items]            
Agreement purchase price $ 10,500          
Percentage of issued share capital to be sold 100.00%          
Percentage of consideration to be paid in cash at completion 50.00%          
Percentage of deferred consideration 50.00%          
Announcement of plan to discontinue operation [member] | BHP Billiton Petroleum (Arkansas) Inc. [member]            
Disclosure of discontinued operations [line items]            
Percentage of issued share capital to be sold 100.00%          
Announcement of plan to discontinue operation [member] | BHP Billiton Petroleum (Fayetteville) LLC [member]            
Disclosure of discontinued operations [line items]            
Percentage of issued share capital to be sold 100.00%          
Announcement of plan to discontinue operation [member] | BHP Billiton Petroleum (Arkansas) Inc. and BHP Billiton Petroleum (Fayetteville) LLC [member]            
Disclosure of discontinued operations [line items]            
Agreement purchase price $ 300