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Long-Term Employee Benefits (Schedule of Information for Pension Plans with Accumulated Benefit Obligation in Excess of Plan Assets) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Long Term Employee Benefits [Abstract]    
Projected benefit obligation $ 25,810 $ 23,481
Accumulated benefit obligation 23,974 21,807
Fair value of plan assets $ 16,576 $ 18,017