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Share Capital - Additional Information (Detail)
 12 Months Ended
Jan. 31, 2022
shares
Jun. 30, 2023
$ / shares
shares
Jun. 30, 2022
$ / shares
shares
Jun. 30, 2021
$ / shares
shares
Jun. 30, 2020
shares
Feb. 23, 2016
$ / shares
BHP Group Limited [member]            
Disclosure of classes of share capital [line items]            
Number of shares issued   3,497,366 4,400,000      
Shares issued price per share | $ / shares   $ 40.51 $ 52.99      
Number of shares transferred corporate structure unification 2,112,071,796 0 2,112,071,796      
Number of shares issued and fully paid   5,065,820,556 5,062,323,190 2,945,851,394 2,945,851,394  
BHP Group Plc [member]            
Disclosure of classes of share capital [line items]            
Number of shares transferred corporate structure unification     (2,112,071,796)      
Number of shares issued and fully paid       2,112,071,796 2,112,071,796  
Special Voting share of no par value [member] | BHP Group Limited [member]            
Disclosure of classes of share capital [line items]            
Number of shares issued and fully paid       1    
Special Voting share of US$0.50 par value [member] | BHP Group Plc [member]            
Disclosure of classes of share capital [line items]            
Shares, par value | $ / shares       $ 0.5    
Number of shares issued and fully paid       1    
DLC Dividend share [member] | BHP Group Limited [member]            
Disclosure of classes of share capital [line items]            
Shares, par value | $ / shares           $ 10
Number of shares issued and fully paid       1