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Common shares (Tables)
 6 Months Ended
Jun. 30, 2018
Equity [Abstract]  
Share Capital
     As at June 30, 2018      As at December 31, 2017  
     Shares      $ million      Shares      $ million  

All shares are common shares of $2.00 par value each

            

Authorized share capital

      800,000,000        1,600        800,000,000        1,600  

Issued and fully paid share capital

      508,763,020        1,017        508,763,020        1,017  

Treasury shares held by the Company

      (4,244,080 )       (9 )       (4,244,080 )       (9 ) 
  

 

 

     

 

 

     

 

 

     

 

 

  

Outstanding common shares in issue

      504,518,940        1,008        504,518,940        1,008