Supplemental Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income (Loss) from Subsidiaries, Net of Tax	$ 16	$ 10
Interest Income, Other	17
Accrued Liabilities
Accrued liabilities	676	657
Accrued rebates	125	108
Non-Cash Investing Activity [Abstract]
Increase (Decrease) in Capital Expenditure Accrual	(48)	(9)	$ 7
Cash Flow Information
Interest paid, net of interest capitalized	140	154	46
Income taxes paid	376	$ 84	3
Axiall Corporation [Member]
Non-Cash Investing Activity [Abstract]
Remeasurement gain (loss)			$ 49
Other Income [Member]
Defined Benefit Plan, Net Periodic Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income	$ 25