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Post-Retirement and Other Long-Term Employees Benefits (Details 2) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Pension Benefits [Member]
      
Components of the net periodic benefit cost      
Service cost $ 34 $ 25 $ 22
Interest cost 33 26 25
Expected return on plan assets (20) (18) (16)
Amortization of actuarial loss (gain) 6 4 6
Amortization of prior service cost 1 1 2
Effect of settlement (1) 5 2
Effect of curtailment   (2) (2)
Net periodic benefit cost 53 41 39
Other Long-Term Benefits [Member]
      
Components of the net periodic benefit cost      
Service cost 8 8 4
Interest cost 3 2 2
Amortization of actuarial loss (gain) (5) 3 (1)
Amortization of prior service cost   1  
Effect of curtailment   (1)  
Net periodic benefit cost $ 6 $ 13 $ 5