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Exceptional Items - Summary of Exceptional Items by Category (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Disclosure of exceptional items [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)
Samarco dam failure [member]      
Disclosure of exceptional items [line items]      
Exceptional items gross (176) (1,060) (650)
Exceptional items tax 0 0 0
Exceptional items net (176) (1,060) (650)
Cancellation Of Power Contracts [Member]      
Disclosure of exceptional items [line items]      
Exceptional items gross (778)    
Exceptional items tax 271    
Exceptional items net (507)    
Global taxation matters [member]      
Disclosure of exceptional items [line items]      
Exceptional items tax   242  
Exceptional items net   242  
US tax reform [member]      
Disclosure of exceptional items [line items]      
Exceptional items tax     (2,320)
Exceptional items net     (2,320)
Non-controlling interests [member]      
Disclosure of exceptional items [line items]      
Exceptional items gross (291)    
Exceptional items tax 90  
Exceptional items net (201)  
Attributable to BHP shareholders [member]      
Disclosure of exceptional items [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)
COVID-19 related costs [Member]      
Disclosure of exceptional items [line items]      
Exceptional items gross (183)    
Exceptional items tax 53    
Exceptional items net (130)    
Cerro Colorado impairment [Member]      
Disclosure of exceptional items [line items]      
Exceptional items gross (409)    
Exceptional items tax (83)    
Exceptional items net $ (492)