Segment and Geographical Area Information Sales and Supply Information (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Customer concentration risk
Concentration Risk
Concentration Risk Percentage	23.00%	22.00%	21.00%
Export sales
Concentration Risk
Concentration Risk Percentage	17.00%	18.00%	14.00%
Supplier concentration risk | Top five major suppliers
Concentration Risk
Concentration Risk Percentage	86.00%	78.00%	83.00%
Supplier concentration risk | Largest supplier
Concentration Risk
Concentration Risk Percentage	25.00%	29.00%	32.00%
Supplier concentration risk | Second and third largest suppliers
Concentration Risk
Concentration Risk Percentage	35.00%	31.00%	34.00%