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Redeemable Noncontrolling Interest (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended 1 Months Ended 12 Months Ended
May 31, 2012
Feb. 29, 2012
Dec. 31, 2012
Dec. 31, 2011
Oct. 18, 2007
item
Redeemable Noncontrolling Interest          
Percentage interest in joint venture (TPDI) that is held by an unaffiliated party (Quantum)   50.00%     50.00%
Number of Ultra-Deepwater Floaters         2
Redeemable noncontrolling interest          
Balance, beginning of period     $ 116 $ 41  
Net income attributable to noncontrolling interest     13 78  
Other comprehensive loss attributable to noncontrolling interest       (3)  
Fair value adjustment to redeemable noncontrolling interest   106 106    
Reclassification to accumulated other comprehensive loss     17    
Reclassification to other current liabilities     (252)    
Balance, end of period       116  
Cumulative adjustment to increase the liability 25        
Issuance of shares in exchange for noncontrolling interest 8.7   8.7    
Adjustment to share capital 134        
Adjustment to additional paid in capital $ 233