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Discontinued Operations - Summary of Exceptional Items - Discontinued Operations (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]      
Exceptional items gross $ (1,546) $ (1,060) $ (650)
Exceptional items tax 241 242 (2,320)
Exceptional items net (1,305) (818) (2,970)
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 (291)    
Exceptional items tax 90  
Exceptional items net (201)  
Attributable to BHP shareholders [member]      
Disclosure of analysis of single amount of discontinued operations [line items]      
Exceptional items gross (1,255) (1,060) (650)
Exceptional items tax 151 242 (2,320)
Exceptional items net $ (1,104) (818) (2,970)
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)
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)