Restructuring and related activities (2020 Restructuring Program) (Details) - USD ($) $ in Millions	3 Months Ended					19 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Mar. 31, 2022	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 10				$ 10
Packaging & Specialty Plastics [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0				0
Industrial Intermediates & Infrastructure [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0				0
Performance Materials & Coatings [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0				0
Corporate Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	10				10
2020 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net				$ 22
Restructuring Charges						$ 585
Restructuring Reserve, Settled without Cash				(12)
Payments for Restructuring	60	$ 34	$ 57	56	49
Restructuring Reserve	108	168	212	269	315	108	$ 364
2020 Restructuring Program [Member] | Accrued and Other Current Liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	53	112				53
2020 Restructuring Program [Member] | Other Noncurrent Obligations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	55	56				55
2020 Restructuring Program [Member] | Packaging & Specialty Plastics [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net				8
2020 Restructuring Program [Member] | Industrial Intermediates & Infrastructure [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net				1
2020 Restructuring Program [Member] | Performance Materials & Coatings [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net				10
2020 Restructuring Program [Member] | Corporate Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net		(10)		3
Employee Severance [Member] | 2020 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net				0
Restructuring Charges						287
Restructuring Reserve, Settled without Cash				0
Payments for Restructuring	59	30	55	53	37
Restructuring Reserve	45	104	144	199	252	45	289
Employee Severance [Member] | 2020 Restructuring Program [Member] | Packaging & Specialty Plastics [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net				0
Employee Severance [Member] | 2020 Restructuring Program [Member] | Industrial Intermediates & Infrastructure [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net				0
Employee Severance [Member] | 2020 Restructuring Program [Member] | Performance Materials & Coatings [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net				0
Employee Severance [Member] | 2020 Restructuring Program [Member] | Corporate Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net		(10)		0
Asset write-downs and write-offs [Member] | 2020 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net				12
Restructuring Charges						208
Restructuring Reserve, Settled without Cash				(12)
Payments for Restructuring	0	0	0	0	0
Restructuring Reserve	0	0	0	0	0	0	0
Asset write-downs and write-offs [Member] | 2020 Restructuring Program [Member] | Packaging & Specialty Plastics [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net				0
Asset write-downs and write-offs [Member] | 2020 Restructuring Program [Member] | Industrial Intermediates & Infrastructure [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net				1
Asset write-downs and write-offs [Member] | 2020 Restructuring Program [Member] | Performance Materials & Coatings [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net				8
Asset write-downs and write-offs [Member] | 2020 Restructuring Program [Member] | Corporate Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net		0		3
Costs Associated with Exit and Disposal Activities [Member] | 2020 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net				10
Restructuring Charges						90
Restructuring Reserve, Settled without Cash				0
Payments for Restructuring	1	4	2	3	12
Restructuring Reserve	$ 63	64	$ 68	70	$ 63	$ 63	$ 75
Costs Associated with Exit and Disposal Activities [Member] | 2020 Restructuring Program [Member] | Packaging & Specialty Plastics [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net				8
Costs Associated with Exit and Disposal Activities [Member] | 2020 Restructuring Program [Member] | Industrial Intermediates & Infrastructure [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net				0
Costs Associated with Exit and Disposal Activities [Member] | 2020 Restructuring Program [Member] | Performance Materials & Coatings [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net				2
Costs Associated with Exit and Disposal Activities [Member] | 2020 Restructuring Program [Member] | Corporate Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net		$ 0		$ 0