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Net finance costs (Tables)
 6 Months Ended
Dec. 31, 2018
Text block [abstract]  
Summary of Net Finance Costs
     Half year
ended
31 Dec
2018
US$M		     Half year
ended
31 Dec
2017
US$M		     Year
ended
30 June
2018
US$M		  

Financial expenses

       

Interest expense using the effective interest rate method:

       

Interest on bank loans, overdrafts and all other borrowings

      660       558       1,168  

Interest capitalised at 4.94% (31 December 2017: 3.86%; 30 June 2018: 4.24%)(1)

      (109 )      (59 )      (139 ) 

Interest on finance leases

      23       29       59  

Discounting on provisions and other liabilities

      223       211       414  

Other gains and losses:

       

Fair value change on hedged loans

      106       93       (265 ) 

Fair value change on hedging derivatives

      (148 )      (26 )      329  

Exchange variations on net debt

      11       (75 )      (19 ) 

Other

      6       6       20  
  

 

 

    

 

 

    

 

 

  

Total Financial expenses

      772       737       1,567  
  

 

 

    

 

 

    

 

 

  

Financial income

       

Interest income

      (239 )      (79 )      (322 ) 
  

 

 

    

 

 

    

 

 

  

Net finance costs

      533       658       1,245  
  

 

 

    

 

 

    

 

 

  

 

(1)

Interest has been capitalised at the rate of interest applicable to the specific borrowings financing the assets under construction or, where financed through general borrowings, at a capitalisation rate representing the average interest rate on such borrowings.