Segment And Geographic Information (Narrative) (Details)	12 Months Ended
	Dec. 31, 2015 plant customer Segment	Dec. 31, 2014 customer	Dec. 31, 2013 customer
Segment Reporting Information [Line Items]
Number of segments | Segment	2
Number of plants | plant	11
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	0