Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Millions					1 Months Ended					3 Months Ended	12 Months Ended
	Oct. 16, 2023	Sep. 12, 2023	May 22, 2019	Jun. 18, 2018	Oct. 31, 2023	Sep. 30, 2023	Apr. 30, 2022	Mar. 31, 2019	May 31, 2017	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Environmental Loss Contingencies [Line Items]
Loss contingency accrual										$ 58	$ 58	$ 55
Avient
Environmental Loss Contingencies [Line Items]
Site Contingency, Percentage of Cost Potentially of Other Responsible Parties			100.00%
Pending Litigation | Avient
Environmental Loss Contingencies [Line Items]
Damages sought							$ 22		$ 11
Site Contingency, Percentage of Cost Potentially of Other Responsible Parties											100.00%
Minimum
Environmental Loss Contingencies [Line Items]
Environmental Exit Costs, Reasonably Possible Additional Loss											$ 98
Maximum
Environmental Loss Contingencies [Line Items]
Environmental Exit Costs, Reasonably Possible Additional Loss											165
Cost of Implementation | Environmental Protection Agency
Environmental Loss Contingencies [Line Items]
Environmental Exit Costs, Anticipated Cost				$ 107
Operation and Maintenance | Environmental Protection Agency | Minimum
Environmental Loss Contingencies [Line Items]
Environmental Exit Costs, Anticipated Cost				1
Operation and Maintenance | Environmental Protection Agency | Maximum
Environmental Loss Contingencies [Line Items]
Environmental Exit Costs, Anticipated Cost				$ 3
Groundwater Monitoring
Environmental Loss Contingencies [Line Items]
Environmental Exit Costs, Anticipated Cost						$ 13
Caustic Soda Antitrust Proceedings | Direct Purchasers | Settled Litigation
Environmental Loss Contingencies [Line Items]
Damages sought								$ 861
Litigation settlement, amount awarded to other party	$ 19
Caustic Soda Antitrust Proceedings | Indirect Purchasers | Settled Litigation
Environmental Loss Contingencies [Line Items]
Damages sought								$ 500
Ethylene Antitrust Litigation Proceedings | Pending Litigation
Environmental Loss Contingencies [Line Items]
Damages sought					$ 1,026
Triad Hunter Proceedings | Settled Litigation
Environmental Loss Contingencies [Line Items]
Litigation settlement, amount awarded to other party		$ 70
Petro 2 Flash Fire And EDC Storage Tank Explosion
Environmental Loss Contingencies [Line Items]
Litigation settlement, amount awarded to other party										150
Loss Contingency, Damages Awarded, Value											382
Loss contingency, receivable										43	43
Loss contingency accrual										$ 183	183
Petro 2 Flash Fire And EDC Storage Tank Explosion | Insurance Claims
Environmental Loss Contingencies [Line Items]
Damages sought											$ 150