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Post-Retirement and Other Long-Term Employees Benefits (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Change in plan assets:      
Plan assets at fair value at beginning of year $ 372    
Employer contributions 30 24  
Plan assets at fair value at end of year 378 372  
Net amount recognized in the of the following:      
Non current assets 1 4  
Current liabilities (16) (21)  
Long-term liabilities (409) (326)  
Pension Benefits [Member]
      
Change in benefit obligation:      
Benefit obligation at beginning of year 701 654  
Service cost 34 25 22
Interest cost 33 26 25
Employee contributions 7 5  
Benefits paid (20) (12)  
Effect of settlement (18) (18)  
Effect of curtailment   (2)  
Actuarial (gain) loss 73 19  
Transfer in 3    
Transfer out (3) (2)  
Plan amendment   12  
Foreign currency translation adjustment (16) (6)  
Benefit obligation at end of year 794 701 654
Change in plan assets:      
Plan assets at fair value at beginning of year 372 339  
Expected return on plan assets 20 18 16
Employer contributions 30 24  
Employee contributions 7 5  
Benefit paid (8) (4)  
Effect of settlement (16) (18)  
Actuarial gain (loss) (25) 1  
Transfer in 1    
Transfer out (1)    
Foreign currency translation adjustments (2) 7  
Plan assets at fair value at end of year 378 372 339
Funded status (416) (329)  
Net amount recognized in the of the following:      
Non current assets 1 4  
Current liabilities (16) (18)  
Long-term liabilities (401) (315)  
Net amount recognized (416) (329)  
Other Long-Term Benefits [Member]
      
Change in benefit obligation:      
Benefit obligation at beginning of year 50 43  
Service cost 8 8 4
Interest cost 3 2 2
Benefits paid (2) (3)  
Effect of curtailment   (1)  
Actuarial (gain) loss (5) 4  
Transfer in 1    
Transfer out (1)    
Foreign currency translation adjustment (2) (3)  
Benefit obligation at end of year 52 50 43
Change in plan assets:      
Funded status (52) (50)  
Net amount recognized in the of the following:      
Current liabilities (3) (3)  
Long-term liabilities (49) (47)  
Net amount recognized $ (52) $ (50)