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Earnings per share (Tables)
 12 Months Ended
Jun. 30, 2020
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Summary of Earnings Per Share
   
2020
   2019   2018 
Earnings attributable to BHP shareholders (US$M)
      
- Continuing operations
  
 
7,956
 
   8,648    6,652 
- Total
  
 
7,956
 
   8,306    3,705 
Weighted average number of shares (Million)
      
- Basic
  
 
5,057
 
   5,180    5,323 
- Diluted
  
 
5,069
 
   5,193    5,337 
Basic earnings per ordinary share (US cents)
      
- Continuing operations
  
 
157.3
 
   166.9    125.0 
- Total
  
 
157.3
 
   160.3    69.6 
Diluted earnings per ordinary share (US cents)
      
- Continuing operations
  
 
157.0
 
   166.5    124.6 
- Total
  
 
157.0
 
   159.9    69.4