Supplemental Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Combination Bargain Purchase Gain Net Of Related Expenses			$ 21
Accrued Liabilities
Accrued liabilities	$ 657	$ 538
Accrued rebates	108	78
Accrued Income Taxes, Current	130	11
Non-Cash Investing Activity [Abstract]
Increase (Decrease) in Capital Expenditure Accrual	(9)	7	(7)
Cash Flow Information
Interest paid, net of interest capitalized	154	46	32
Income taxes paid	$ 84	3	$ 314
Axiall Corporation [Member]
Non-Cash Investing Activity [Abstract]
Remeasurement gain (loss)		$ (49)