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Business Combinations (Details)
$ / shares in Units, shares in Millions, $ in Millions
9 Months Ended
Sep. 04, 2018
USD ($)
$ / shares
shares
Mar. 28, 2018
USD ($)
shares
Jan. 30, 2018
USD ($)
item
$ / shares
shares
Jan. 16, 2018
shares
Sep. 30, 2018
USD ($)
item
Sep. 30, 2017
USD ($)
Business Combination            
Number of mobile offshore drilling units | item         41  
Aggregate consideration            
Acquisition of noncontrolling interest in compulsory acquisition         $ 31  
Ultra-deepwater floaters            
Business Combination            
Number of mobile offshore drilling units | item         23  
Number of mobile offshore drilling units under construction | item         2  
Harsh environment floaters            
Business Combination            
Number of mobile offshore drilling units | item         12  
Number of mobile offshore drilling units under construction | item         1  
Ocean Rig            
Business Combination            
Number of mobile offshore drilling units | item         11  
Ocean Rig | Ultra-deepwater floaters            
Business Combination            
Number of mobile offshore drilling units | item         9  
Number of mobile offshore drilling units under construction | item         2  
Ocean Rig | Harsh environment floaters            
Business Combination            
Number of mobile offshore drilling units | item         2  
Ocean Rig            
Business Combination            
Ratio of shares to be issued for consideration 1.6128          
Business combination consideration (per share) | $ / shares $ 12.75          
Newly issued shares (in shares) | shares 147.7          
Maximum cash consideration $ 1,170          
Songa            
Business Combination            
Business combination consideration (per share) | $ / shares     $ 10.99      
Newly issued shares (in shares) | shares   68.0 66.9      
Number of mobile offshore drilling units | item     7      
Ownership interest (as a percent)     97.70%      
Acquisition costs         $ 7 $ 3
Aggregate consideration            
Aggregate fair value of shares issued as partial consideration for Songa shares     $ 735      
Consideration transferred to Songa shareholders     1,410      
Total consideration     1,761      
Issuance of shares in acquisition transactions (in shares) | shares   1.1        
Cash payment to acquire noncontrolling interest   $ 8        
Songa | Maximum            
Business Combination            
Newly issued shares (in shares) | shares       68.6    
Songa | 0.50% Exchangeable Bonds due January 2023            
Business Combination            
Convertible debt   9 854      
Aggregate consideration            
Acquisition of noncontrolling interest in compulsory acquisition   $ 30        
Songa | 0.50% Exchangeable Bonds, acquire Songa shares            
Business Combination            
Convertible debt     562      
Aggregate consideration            
Aggregate fair value of Exchangeable Bonds issued     675      
Songa | 0.50% Exchangeable Bonds, settle Songa debt            
Business Combination            
Convertible debt     292      
Aggregate consideration            
Aggregate fair value of Exchangeable Bonds issued     $ 351      
Songa | Harsh environment floaters            
Business Combination            
Number of mobile offshore drilling units | item     5      
Songa | High specification harsh environment floaters            
Business Combination            
Number of mobile offshore drilling units | item     4