NONCONSOLIDATED AFFILIATES (Impact of Sales to Nonconsolidated Affiliates) (Details) - Equity Method Investee	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
MEGlobal | Customer Concentration Risk | Revenue Benchmark
Schedule of Equity Method Investments [Line Items]
Concentration Risk, Percentage	1.00%	1.00%	1.00%
MEGlobal | Customer Concentration Risk | Packaging & Specialty Plastics [Member] | Revenue, Segment Benchmark
Schedule of Equity Method Investments [Line Items]
Concentration Risk, Percentage	2.00%	2.00%	2.00%
MEGlobal | Customer Concentration Risk | Industrial Intermediates & Infrastructure [Member] | Revenue, Segment Benchmark
Schedule of Equity Method Investments [Line Items]
Concentration Risk, Percentage	1.00%	1.00%	1.00%
Sadara Chemical Company | Supplier Concentration Risk | Cost of Goods and Service Benchmark
Schedule of Equity Method Investments [Line Items]
Concentration Risk, Percentage	5.00%	6.00%	6.00%
SCG-Dow Group | Supplier Concentration Risk | Cost of Goods and Service Benchmark
Schedule of Equity Method Investments [Line Items]
Concentration Risk, Percentage	2.00%	3.00%	3.00%