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Discontinued Operations - Summary of Net Loss on Disposal of Discontinued Operations (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2021
Jun. 30, 2020
Disclosure of analysis of single amount of discontinued operations [line items]      
Net assets   $ 55,605 $ 52,175
Net loss on disposal $ (510)    
Discontinued operations [member]      
Disclosure of analysis of single amount of discontinued operations [line items]      
Net assets 11,111    
Less non-controlling interest share of net assets disposed (168)    
BHP Share of net assets disposed 10,943    
Gross consideration 10,555    
Less transaction costs (54)    
Income tax expense (68)    
Net loss on disposal $ (510)