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Property plant and equipment (Tables)
6 Months Ended
Jun. 30, 2018
Drilling Unit [Member]  
Property plant and equipment
(In $ millions)    As at June 30,
2018
     As at December 31,
2017
 

Cost

     17,452        17,335  

Accumulated depreciation

     (4,507      (4,119

Impairment

     (414      —    
  

 

 

    

 

 

 

Net book value

     12,531        13,216  
  

 

 

    

 

 

 
Newbuildings [Member]  
Property plant and equipment

(In $ millions)

   As at June 30,
2018
     As at December 31,
2017
 

Total Newbuildings

     249        248