RESTRUCTURING, GOODWILL IMPAIRMENT AND ASSET RELATED CHARGES - NET (2023 Restructuring Program) (Details) - USD ($)	3 Months Ended							12 Months Ended			36 Months Ended
	Mar. 31, 2025	Dec. 31, 2024	Sep. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2025
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net								$ 1,856,000,000	$ 103,000,000	$ 528,000,000
2023 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net					$ 14,000,000	$ 8,000,000	$ 541,000,000	1,000,000	66,000,000	535,000,000	$ 602,000,000
Payments for Restructuring								60,000,000	103,000,000	222,000,000
Restructuring Reserve		$ 60,000,000			122,000,000			$ 0	60,000,000	122,000,000	$ 0
Restructuring and related workforce reduction								2,000			2,000
Restructuring Reserve, Settled without Cash								$ (1,000,000)	(25,000,000)	(191,000,000)
2023 Restructuring Program | Segment Reporting, Reconciling Item, Corporate Nonsegment
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									51,000,000	435,000,000
2023 Restructuring Program | Industrial Intermediates & Infrastructure [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net								1,000,000
2023 Restructuring Program | Industrial Intermediates & Infrastructure [Member] | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									8,000,000	50,000,000
2023 Restructuring Program | Performance Materials & Coatings [Member] | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									7,000,000	49,000,000
2023 Restructuring Program | Packaging & Specialty Plastics [Member] | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net										1,000,000
Severance and Related Benefit Costs | 2023 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net								0	41,000,000	344,000,000	$ 385,000,000
Payments for Restructuring								60,000,000	103,000,000	222,000,000
Restructuring Reserve		60,000,000			122,000,000			0	60,000,000	122,000,000	0
Restructuring Reserve, Settled without Cash								0	0	0
Severance and Related Benefit Costs | 2023 Restructuring Program | Segment Reporting, Reconciling Item, Corporate Nonsegment
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net		25,000,000	$ 16,000,000						41,000,000	344,000,000
Severance and Related Benefit Costs | 2023 Restructuring Program | Industrial Intermediates & Infrastructure [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net								0	0	0
Severance and Related Benefit Costs | 2023 Restructuring Program | Performance Materials & Coatings [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									0	0
Severance and Related Benefit Costs | 2023 Restructuring Program | Packaging & Specialty Plastics [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net										0
Asset Write-downs and Write-offs | 2023 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net								1,000,000	16,000,000	191,000,000	208,000,000
Payments for Restructuring								0	0	0
Restructuring Reserve		0			0			0	0	0	0
Restructuring Reserve, Settled without Cash								(1,000,000)	(16,000,000)	(191,000,000)
Asset Write-downs and Write-offs | 2023 Restructuring Program | Segment Reporting, Reconciling Item, Corporate Nonsegment
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net			1,000,000						1,000,000	91,000,000
Asset Write-downs and Write-offs | 2023 Restructuring Program | Industrial Intermediates & Infrastructure [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net	$ 5,000,000			$ 8,000,000				1,000,000	8,000,000	50,000,000
Asset Write-downs and Write-offs | 2023 Restructuring Program | Performance Materials & Coatings [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net			$ 7,000,000						7,000,000	49,000,000
Asset Write-downs and Write-offs | 2023 Restructuring Program | Packaging & Specialty Plastics [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net										1,000,000
Costs Associated with Exit and Disposal Activities [Member] | 2023 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net								0	9,000,000	0	9,000,000
Payments for Restructuring								0	0	0
Restructuring Reserve		0			$ 0			0	0	0	$ 0
Restructuring Reserve, Settled without Cash								0	(9,000,000)	0
Costs Associated with Exit and Disposal Activities [Member] | 2023 Restructuring Program | Segment Reporting, Reconciling Item, Corporate Nonsegment
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net		$ 9,000,000							9,000,000	0
Costs Associated with Exit and Disposal Activities [Member] | 2023 Restructuring Program | Industrial Intermediates & Infrastructure [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net								0	0	0
Costs Associated with Exit and Disposal Activities [Member] | 2023 Restructuring Program | Performance Materials & Coatings [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									0	0
Costs Associated with Exit and Disposal Activities [Member] | 2023 Restructuring Program | Packaging & Specialty Plastics [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net										$ 0
Restructuring Implementation Costs | 2023 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Payments for Restructuring								$ 50,000,000	$ 230,000,000
Asset related credit adjustment | 2023 Restructuring Program | Industrial Intermediates & Infrastructure [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net	$ 4,000,000