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Postretirement Benefit Plans (Details 9)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Weighted-average assumptions used to determine net periodic benefit cost      
Expected rate of return on plan assets 9.00% 9.00% 9.00%
U.S. Pension Plans [Member]
     
Weighted-average assumptions used to determine projected benefit obligations      
Discount rate 4.79% 5.69%  
Weighted-average assumptions used to determine net periodic benefit cost      
Discount rate 5.69% 6.00%  
Expected rate of return on plan assets 9.00% 9.00%  
International Pension Plan [Member]
     
Weighted-average assumptions used to determine projected benefit obligations      
Discount rate 4.85% 5.03%  
Rate of future compensation increase 2.46% 2.42%  
Weighted-average assumptions used to determine net periodic benefit cost      
Discount rate 5.03% 5.09%  
Expected rate of return on plan assets 4.75% 4.75%  
Other Benefits [Member]
     
Weighted-average assumptions used to determine projected benefit obligations      
Discount rate 4.80% 5.50%  
Weighted-average assumptions used to determine net periodic benefit cost      
Discount rate 5.50% 6.00%  
Expected rate of return on plan assets 9.00% 9.00%