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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, 2020
Disclosure of analysis of single amount of discontinued operations [line items]    
Net assets $ 51,824 $ 52,246
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)