Benefit Obligations (Schedule of Principle Weighted-average Assumptions Used to Determine Benefit Obligations and Benefit Cost) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Pension Benefits [Member]
Discount rate obligations	4.61%	5.26%
Rate of compensation increase	3.58%	3.58%
Discount rate obligations	5.26%	5.83%	6.41%
Expected return on plan assets	8.06%	8.06%	7.94%
Rate of compensation increase	3.58%	3.84%	3.90%
United States Pension Plans of US Entity, Defined Benefit [Member]
Discount rate obligations	4.60%	5.30%
Rate of compensation increase	4.00%	4.00%
Discount rate obligations	5.30%	5.90%	6.50%
Expected return on plan assets	8.50%	8.50%	8.50%
Rate of compensation increase	4.00%	4.00%	4.00%
Foreign Pension Plans, Defined Benefit [Member]
Discount rate obligations	4.70%	5.05%
Rate of compensation increase	2.63%	2.66%
Discount rate obligations	5.05%	5.41%	5.84%
Expected return on plan assets	6.00%	6.07%	5.29%
Rate of compensation increase	2.66%	2.94%	3.24%
Postretirement Benefits [Member]
Discount rate obligations	4.28%	4.91%
Discount rate obligations	4.91%	5.50%	6.37%
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]
Discount rate obligations	4.30%	4.90%
Discount rate obligations	4.90%	5.50%	6.40%
Foreign Postretirement Benefit Plans, Defined Benefit [Member]
Discount rate obligations	4.10%	4.95%
Discount rate obligations	4.95%	5.49%	6.11%