Employee Benefits Plans (Details 14)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Other Postretirement Benefits U.S [Member]
Summary of actuarial assumptions used in determining accrued postretirement benefit obligations
Discount rate	5.70%	6.20%	6.25%
Rate of increase in compensation levels	4.00%	4.00%
Healthcare cost trend rate assumed for next year	8.00%	8.00%
Rate to which the cost trend rate is assumed to decline (ultimate trend rate)	5.00%	5.00%
Year that the rate reaches the ultimate trend rate	2018	2017
Other Postretirement Benefits U.S [Member] | Actuarial assumptions used in determining accrued postretirement benefit obligations [Member]
Summary of actuarial assumptions used in determining accrued postretirement benefit obligations
Discount rate	4.90%	5.70%
Other Postretirement Benefits Foreign [Member]
Summary of actuarial assumptions used in determining accrued postretirement benefit obligations
Discount rate	5.25%	6.00%	6.75%
Rate of increase in compensation levels	3.50%	3.50%
Healthcare cost trend rate assumed for next year	7.50%	8.00%
Rate to which the cost trend rate is assumed to decline (ultimate trend rate)	5.00%	5.00%
Year that the rate reaches the ultimate trend rate	2017	2017
Other Postretirement Benefits Foreign [Member] | Actuarial assumptions used in determining accrued postretirement benefit obligations [Member]
Summary of actuarial assumptions used in determining accrued postretirement benefit obligations
Discount rate	4.50%	5.25%