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, 2021	Dec. 31, 2020
Environmental Loss Contingencies [Line Items]
Environmental Loss contingency accrual				$ 55	$ 53
Site Contingency, Percentage of Cost Potentially of Other Responsible Parties [Line Items]				100.00%
Avient
Environmental Loss Contingencies [Line Items]
Site Contingency, Percentage of Cost Potentially of Other Responsible Parties [Line Items]	100.00%
Avient | Pending Litigation
Environmental Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value			$ 11
Minimum
Environmental Loss Contingencies [Line Items]
Environmental Exit Costs, Reasonably Possible Additional Loss				$ 65
Maximum
Environmental Loss Contingencies [Line Items]
Environmental Exit Costs, Reasonably Possible Additional Loss				130
EPA | Operation and Maintenance
Environmental Loss Contingencies [Line Items]
Environmental Remediation Expense		$ 107
EPA | Operation and Maintenance | Minimum
Environmental Loss Contingencies [Line Items]
Environmental Exit Costs, Anticipated Cost				1
EPA | Operation and Maintenance | Maximum
Environmental Loss Contingencies [Line Items]
Environmental Exit Costs, Anticipated Cost				$ 3