Segment Information (Total Assets) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 19,741	$ 18,459
Operating Segments [Member] | Olefins
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	13,988	11,938
Operating Segments [Member] | Vinyls
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	5,139	5,021
Corporate and other [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 614	$ 1,500