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Dividends - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
 6 Months Ended 12 Months Ended
Feb. 18, 2020
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2019
Disclosure of dividends [line items]        
Dividend per share, after period-end     $ 0.55 $ 0.78
Dividend amount, after period-end     $ 2,788 $ 3,946
Shares in BHP Group Limited that were held by BHP Group Plc   0 0 0
Major ordinary share transactions [member]        
Disclosure of dividends [line items]        
Dividend per share, after period-end $ 0.65      
Dividend amount, after period-end $ 3,287      
BHP Group Limited [member]        
Disclosure of dividends [line items]        
Number of ordinary shares represented by each American Depositary Share   2    
Ordinary shares on issue and held by the public   2,945,000,000    
Tax rate   30.00%    
BHP Group Plc [member]        
Disclosure of dividends [line items]        
Number of ordinary shares represented by each American Depositary Share   2    
Ordinary shares on issue and held by the public   2,112,000,000