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Share Capital - Additional Information (Detail)
 12 Months Ended
Jan. 31, 2022
£ / shares
shares
Jun. 30, 2022
shares
Jun. 30, 2021
£ / shares
shares
Jun. 30, 2020
£ / shares
shares
Aug. 31, 2021
$ / shares
shares
Jun. 30, 2021
$ / shares
shares
Jun. 30, 2020
$ / shares
shares
Jun. 30, 2019
shares
Feb. 23, 2016
$ / shares
BHP Group Limited [member]                  
Disclosure of classes of share capital [line items]                  
Number of shares issued   4,400,000     4,400,000        
Shares issued price per share | $ / shares         $ 52.99        
Number of shares transferred corporate structure unification 2,112,071,796 2,112,071,796              
Number of shares issued and fully paid   5,062,323,190 2,945,851,394 2,945,851,394   2,945,851,394 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   2,112,071,796 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   1 1   1 1    
Special Voting share of no par value [member] | BHP Group Plc [member]                  
Disclosure of classes of share capital [line items]                  
Number of shares issued 1                
Special Voting share of US$0.50 par value [member] | BHP Group Limited [member]                  
Disclosure of classes of share capital [line items]                  
Number of shares issued 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 $ 0.5    
Number of shares issued and fully paid 1   1 1   1 1    
5.5% Preference shares [member]                  
Disclosure of classes of share capital [line items]                  
Shares, par value | £ / shares     £ 1 £ 1          
Preference Shares Annual Dividend Percentage     5.50% 5.50%          
Number of shares issued and fully paid   0 50,000 50,000   50,000 50,000    
5.5% Preference shares [member] | BHP Group Plc [member]                  
Disclosure of classes of share capital [line items]                  
Shares, par value | £ / shares     £ 1 £ 1          
Preference Shares Annual Dividend Percentage     5.50% 5.50%          
Number of shares issued and fully paid     50,000 50,000   50,000 50,000    
5.5% Preference shares [member] | BHP Group Plc [member] | JP Morgan Limited [Member]                  
Disclosure of classes of share capital [line items]                  
Shares, par value | £ / shares £ 1                
Share Buy Back and Cancelled 50,000                
Preference Shares Annual Dividend Percentage   5.50%              
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   1 1   1 1