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Earnings per share (Tables)
 12 Months Ended
Jun. 30, 2019
Text block [abstract]  
Summary of Earnings Per Share
     2019      2018      2017  

Earnings attributable to BHP shareholders (US$M)

         

- Continuing operations

      8,648        6,652        6,375  

- Total

      8,306        3,705        5,890  

Weighted average number of shares (Million)

         

- Basic

      5,180        5,323        5,323  

- Diluted

      5,193        5,337        5,336  

Basic earnings per ordinary share (US cents)

         

- Continuing operations

      166.9        125.0        119.8  

- Total

      160.3        69.6        110.7  

Diluted earnings per ordinary share (US cents)

         

- Continuing operations

      166.5        124.6        119.5  

- Total

      159.9        69.4        110.4