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Business (Details)
Jul. 31, 2016
subsidiary
shares
Sep. 30, 2016
item
SFr / shares
Dec. 31, 2015
SFr / shares
Oct. 29, 2015
SFr / shares
Approved par value of common stock (in Swiss francs per share) | SFr / shares       SFr 0.10
Par value of common stock (in Swiss francs per share) | SFr / shares   SFr 0.10 SFr 15.00 SFr 15.00
Continuing operations        
Number of mobile offshore drilling units   58    
Number of Ultra-Deepwater Floaters   29    
Number of Harsh Environment Floaters   7    
Number of Deepwater Floaters   4    
Number of Midwater Floaters (in drilling units)   8    
Number of High-Specification Jackups (in drilling units)   10    
Number of Ultra-Deepwater drillships under construction (in drilling units)   5    
Number of High-Specification Jackup under construction (in drilling units)   5    
Merger Agreement | Transocean Partners        
Number of subsidiaries party to agreement | subsidiary 2      
Number of subsidiaries merging | subsidiary 1      
Number of securities to be issued for each unit | shares 1.1427      
Total number of securities to be issued in merger | shares 22,700,000