Segment And Geographic Information (Narrative) (Details)	12 Months Ended
	Dec. 31, 2014 customer	Dec. 31, 2013 customer	Dec. 31, 2012 customer
Segment Reporting Information [Line Items]
Number of segments	2
Number of plants	12
Olefins [Member]
Segment Reporting Information [Line Items]
Number of major customers	0	0	0
Vinyls [Member]
Segment Reporting Information [Line Items]
Number of major customers	0	0
PVC Joint Venture In China [Member]
Segment Reporting Information [Line Items]
Ownership interest	59.00%