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Noncontrolling Interest (Details)
$ in Millions
 1 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
shares
Sep. 30, 2015
USD ($)
Dec. 31, 2015
shares
Jun. 30, 2016
Nov. 04, 2015
USD ($)
Noncontrolling interest            
Distribution to holders of noncontrolling interest   $ 23 $ 21      
TDSOI            
Noncontrolling interest            
Ownership interest held by minority interest (as a percent)         30.00%  
Cash payment for repurchase of noncontrolling interest $ 2          
Increase (decrease) in amount $ 12          
Unit repurchase program            
Noncontrolling interest            
Authorized repurchase amount           $ 40
Transocean Partners            
Noncontrolling interest            
Common units held by parent | shares   21,300,000   21,300,000    
Subordinated units held by parent | shares   27,600,000   27,600,000    
Shares repurchased (in shares) | shares   386,876        
Value of shares repurchased   $ 3        
Common units outstanding (in units) | shares   19,700,000   20,000,000    
Percentage of limited liability company interest held by parent   71.3   70.9    
Dividends   $ 74 74      
Distribution to holders of noncontrolling interest   $ 21 $ 21