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Discontinued Operations - Additional Information (Detail)
$ in Millions
 12 Months Ended
Jun. 01, 2022
shares
May 26, 2022
shares
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Disclosure of analysis of single amount of discontinued operations [line items]          
Total comprehensive income (loss) attributable to BHP shareholders     $ 12,917 $ 30,820 $ 11,352
Exceptional items net     606 1,074 5,480
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)
Exceptional items net     $ 0 (8,159) $ 317
Consideration paid consisting of cash and cash equivalents       683  
Cash and cash equivalents in subsidiary or businesses acquired or disposed       (399)  
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