Goodwill and Other Intangible Assets (Narrative) (Details) - Measurement Input, Discount Rate [Member] - Valuation Technique, Discounted Cash Flow [Member]	Dec. 31, 2019
Olefins [Member]
Goodwill [Line Items]
Alternative Investment, Measurement Input	0.095
Vinyls [Member] \| Minimum [Member]
Goodwill [Line Items]
Alternative Investment, Measurement Input	0.09
Vinyls [Member] \| Maximum [Member]
Goodwill [Line Items]
Alternative Investment, Measurement Input	0.125

Value of input used to measure alternative investment.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

Name:	us-gaap_AlternativeInvestmentMeasurementInput
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant