Employee Benefits Plans (Details 11)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Other Postretirement benefit expense U.S. [Member]
Weighted-average discount rates used in determining annual postretirement benefit expense
Discount rate	5.70%	6.20%	6.25%
Other Postretirement benefit expense Foreign [Member]
Weighted-average discount rates used in determining annual postretirement benefit expense
Discount rate	5.25%	6.00%	6.75%