Commitments and Contingencies (Additional Information) (Detail) - USD ($) $ in Millions			1 Months Ended	9 Months Ended
	May 22, 2019	Jun. 18, 2018	May 31, 2017	Sep. 30, 2020	Dec. 31, 2019
Environmental Loss Contingencies [Line Items]
Environmental Loss contingency accrual				$ 48	$ 47
Site Contingency, Percentage of Cost Potentially of Other Responsible Parties [Line Items]				100.00%
Avient [Member]
Environmental Loss Contingencies [Line Items]
Site Contingency, Percentage of Cost Potentially of Other Responsible Parties [Line Items]	100.00%
Avient [Member] | Pending Litigation [Member]
Environmental Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value			$ 11
Minimum [Member]
Environmental Loss Contingencies [Line Items]
Environmental Exit Costs, Reasonably Possible Additional Loss				$ 70
Maximum [Member]
Environmental Loss Contingencies [Line Items]
Environmental Exit Costs, Reasonably Possible Additional Loss				130
Environmental Protection Agency [Member] | Operation and Maintenance [Member]
Environmental Loss Contingencies [Line Items]
Environmental Remediation Expense		$ 107
Environmental Protection Agency [Member] | Operation and Maintenance [Member] | Minimum [Member]
Environmental Loss Contingencies [Line Items]
Environmental Exit Costs, Anticipated Cost				1
Environmental Protection Agency [Member] | Operation and Maintenance [Member] | Maximum [Member]
Environmental Loss Contingencies [Line Items]
Environmental Exit Costs, Anticipated Cost				$ 3