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Dividends - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Aug. 17, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Disclosure of dividends [line items]        
Tax rate   30.00% 30.00% 30.00%
Proceeds/(settlements) of cash management related instruments   $ (401) $ 85 $ 296
Major ordinary share transactions [member]        
Disclosure of dividends [line items]        
Dividend per share, after period-end $ 2   $ 0.55 $ 0.78
Dividend amount, after period-end $ 10,114   $ 2,782 $ 3,944
Proceeds/(settlements) of cash management related instruments   $ 8    
BHP Group Limited [member]        
Disclosure of dividends [line items]        
Number of ordinary shares represented by each American Depositary Share   2    
Tax rate   30.00%    
BHP Group Plc [member]        
Disclosure of dividends [line items]        
Number of ordinary shares represented by each American Depositary Share   2