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Exceptional Items - Summary of Exceptional Items by Category (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Disclosure of exceptional items [line items]      
Exceptional items gross $ (1,060) $ (650) $ (763)
Exceptional items tax 242 (2,320) (243)
Exceptional items net (818) (2,970) (1,006)
Samarco dam failure [member]      
Disclosure of exceptional items [line items]      
Exceptional items gross (1,060) (650) (381)
Exceptional items tax 0 0 0
Exceptional items net (1,060) (650) (381)
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)  
Escondida industrial action [member]      
Disclosure of exceptional items [line items]      
Exceptional items gross     (546)
Exceptional items tax     179
Exceptional items net     (367)
Cancellation of the Caroona exploration licence [member]      
Disclosure of exceptional items [line items]      
Exceptional items gross     164
Exceptional items tax     (49)
Exceptional items net     115
Withholding tax on Chilean dividends [member]      
Disclosure of exceptional items [line items]      
Exceptional items tax     (373)
Exceptional items net     (373)
Non-controlling interests [member]      
Disclosure of exceptional items [line items]      
Exceptional items gross     (232)
Exceptional items tax     68
Exceptional items net     (164)
Attributable to BHP shareholders [member]      
Disclosure of exceptional items [line items]      
Exceptional items gross (1,060) (650) (531)
Exceptional items tax 242 (2,320) (311)
Exceptional items net $ (818) $ (2,970) $ (842)