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Discontinued Operations - Summary of Exceptional Items - Discontinued Operations (Detail) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2018
Disclosure of analysis of single amount of discontinued operations [line items]      
Exceptional items gross $ (210) $ (210) $ (650)
Exceptional items tax 242 (2,320) (2,320)
Exceptional items net 32 (2,530) (2,970)
US tax reform [member]      
Disclosure of analysis of single amount of discontinued operations [line items]      
Exceptional items tax   (2,320) (2,320)
Exceptional items net   (2,320) (2,320)
Non-controlling interests [member]      
Disclosure of analysis of single amount of discontinued operations [line items]      
Exceptional items gross    
Exceptional items tax    
Exceptional items net    
Attributable to BHP shareholders [member]      
Disclosure of analysis of single amount of discontinued operations [line items]      
Exceptional items gross (210) (210) (650)
Exceptional items tax 242 (2,320) (2,320)
Exceptional items net 32 (2,530) (2,970)
Discontinued operations [member]      
Disclosure of analysis of single amount of discontinued operations [line items]      
Exceptional items gross   (2,859)
Exceptional items tax   492 601
Exceptional items net $ 0 492 (2,258)
Discontinued operations [member] | US tax reform [member]      
Disclosure of analysis of single amount of discontinued operations [line items]      
Exceptional items gross  
Exceptional items tax   492 492
Exceptional items net   492 492
Discontinued operations [member] | Impairment of Onshore US assets [member]      
Disclosure of analysis of single amount of discontinued operations [line items]      
Exceptional items gross     (2,859)
Exceptional items tax     109
Exceptional items net     (2,750)
Discontinued operations [member] | Non-controlling interests [member]      
Disclosure of analysis of single amount of discontinued operations [line items]      
Exceptional items gross  
Exceptional items tax  
Exceptional items net  
Discontinued operations [member] | Attributable to BHP shareholders [member]      
Disclosure of analysis of single amount of discontinued operations [line items]      
Exceptional items gross   (2,859)
Exceptional items tax   492 601
Exceptional items net   $ 492 $ (2,258)