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Discontinued Operations - Additional Information (Detail)
$ in Millions
 12 Months Ended
Jun. 01, 2022
shares
May 26, 2022
shares
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Disclosure of analysis of single amount of discontinued operations [line items]          
Total comprehensive income (loss) attributable to BHP shareholders     $ (30,820) $ (11,352) $ (7,898)
Consideration paid consisting of cash and cash equivalents     683    
Cash and cash equivalents in subsidiary or businesses acquired or disposed     (399)    
Discontinued operations [member]          
Disclosure of analysis of single amount of discontinued operations [line items]          
Total comprehensive income (loss) attributable to BHP shareholders     10,596 231 118
Consideration paid consisting of cash and cash equivalents     683    
Cash and cash equivalents in subsidiary or businesses acquired or disposed     (399) 0 0
Discontinued operations [member] | Woodside [Member]          
Disclosure of analysis of single amount of discontinued operations [line items]          
Shares received as consideration for disposal of business | shares 914,768,948        
Consideration paid consisting of cash and cash equivalents     700    
Cash and cash equivalents in subsidiary or businesses acquired or disposed     400    
Cash and cash equivalents transferred including cash disposed off     1,100    
Discontinued operations [member] | Petroleum [member] | Operating segments [member]          
Disclosure of analysis of single amount of discontinued operations [line items]          
Shares received as consideration for disposal of business | shares   914,768,948      
Share distribution per share held after disposal of business | shares   5.534      
Consideration paid consisting of cash and cash equivalents     $ 683 $ 0 $ 0