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Loss on disposals and contingent consideration (Tables)
 6 Months Ended
Jun. 30, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Summary of Loss on Disposals and Contingent Consideration
(In $ millions)    Six Months Ended
June 30,		  
     2018      2017  

Loss on disposals

      

Loss on disposal of West Triton to Shelf Drilling

      —          (34 ) 

Loss on disposal of West Resolute to Shelf Drilling

      —          (61 ) 

Loss on disposal of West Mischief to Shelf Drilling

      —          (71 ) 
  

 

 

     

 

 

  

Total loss on disposals

      —          (166 ) 
  

 

 

     

 

 

  

Contingent Consideration realized

      

West Polaris earn out realized

      —          4  

West Vela earn out realized

      7        7  
  

 

 

     

 

 

  

Total contingent consideration recognized

      7        11