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Post-Retirement and Other Long-Term Employees Benefits (Details 1) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Accumulated other comprehensive income (loss) before tax effects    
Other comprehensive loss, actuarial (gains)/losses, beginning balance $ 86 $ 72
Other comprehensive loss, prior service cost, beginning balance 11 4
Net amount generated/arising in current year, actuarial (gains)/losses 98 21
Amortization, actuarial (gains)/losses (6) (9)
Foreign currency translation, actuarial (gains)/losses before tax (3) 2
Other comprehensive loss, actuarial (gains)/losses, ending balance 175 86
Net amount generated/arising in current year, prior service cost   12
Amortization, prior service cost (1) (5)
Other comprehensive loss, prior service cost, ending balance 10 11
Other comprehensive loss, Total, beginning balance 97 76
Net amount generated/arising in current year, Total 98 33
Amortization, Total (7) (14)
Foreign currency translation adjustment, Total (3) 2
Other comprehensive loss, Total, ending balance $ 185 $ 97