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Equity (Tables)
 12 Months Ended
Dec. 31, 2018
Text block [abstract]  
Summary of Equity Share Capital

Equity share capital

 

     Number
of shares
millions		      Nominal
value
$m		      Share
premium
$m		      Equity
share
capital
$m		  

Allotted, called up and fully paid

            

At 1 January 2016 (ordinary shares of 15265/329p each)

      248        58        111        169  

Share capital consolidation

      (42 )       —          —          —    

Exchange adjustments

      —          (10 )       (18 )       (28 ) 
  

 

 

     

 

 

     

 

 

     

 

 

  

At 31 December 2016 (ordinary shares of 18318/329p each)

      206        48        93        141  

Share capital consolidation

      (9 )       —          —          —    

Exchange adjustments

      —          5        8        13  
  

 

 

     

 

 

     

 

 

     

 

 

  

At 31 December 2017 (ordinary shares of 1917/21p each)

      197        53        101        154  

Exchange adjustments

      —          (3 )       (5 )       (8 ) 
  

 

 

     

 

 

     

 

 

     

 

 

  

At 31 December 2018 (ordinary shares of 1917/21p each)

      197        50        96        146  
  

 

 

     

 

 

     

 

 

     

 

 

  

 

 
Summary of Cash Flow Hedging Reserve

The cash flow hedging reserve is analysed as follows:

 

     Cash flow hedging reserve  
     Value of
currency swaps
$m		      Cost of
hedging
$m		      Total
$m		  

At 1 January 2018

      0        0        0  

Costs of hedging deferred and recognised in OCI

      0        (1 )       (1 ) 

Change in fair value of currency swaps recognised in OCI

      4        0        4  

Reclassified from OCI to profit or loss – included in financial expenses

      (8 )       0        (8 ) 

Deferred tax

      1        0        1  
  

 

 

     

 

 

     

 

 

  

At 31 December 2018

      (3 )       (1 )       (4 )