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Discontinued Operations - Summary of Exceptional Items - Discontinued Operations (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Disclosure of analysis of single amount of discontinued operations [line items]      
Exceptional items gross $ (1,060) $ (650) $ (763)
Exceptional items tax 242 (2,320) (243)
Exceptional items net (818) (2,970) (1,006)
US tax reform [member]      
Disclosure of analysis of single amount of discontinued operations [line items]      
Exceptional items tax   (2,320)  
Exceptional items net   (2,320)  
Non-controlling interests [member]      
Disclosure of analysis of single amount of discontinued operations [line items]      
Exceptional items gross     (232)
Exceptional items tax     68
Exceptional items net     (164)
Attributable to BHP shareholders [member]      
Disclosure of analysis of single amount of discontinued operations [line items]      
Exceptional items gross (1,060) (650) (531)
Exceptional items tax 242 (2,320) (311)
Exceptional items net (818) (2,970) (842)
Discontinued operations [member]      
Disclosure of analysis of single amount of discontinued operations [line items]      
Exceptional items gross   (2,859)  
Exceptional items tax   601  
Exceptional items net $ 0 (2,258) $ 0
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  
Exceptional items net   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   601  
Exceptional items net   $ (2,258)