Supplemental Information (Additional Information) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Restructuring Costs and Asset Impairment Charges	$ 8		$ 8
Restructuring Charges		$ 3	34	$ 22
Accrued Liabilities and Other Liabilities [Abstract]
Accrued and other liabilities	771		771		$ 768
Accrued rebates	114		114		115
Accrued and other liabilities	93		93		93
Accrued liabilities with related parties	$ 37		37		$ 41
Noncash Investing and Financing Items [Abstract]
Accruals for Capital Expenditure			$ (49)	(24)
Vinyls
Schedule of Equity Method Investments [Line Items]
Business Combination, Acquisition Related Costs		$ 5		$ 10