Restructuring and related activities (2020 Restructuring Program) (Details) - USD ($) $ in Millions	3 Months Ended						6 Months Ended		22 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 10				$ 43		$ 20	$ 53
Packaging & Specialty Plastics [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0				8		0	8
Industrial Intermediates & Infrastructure [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0				1		0	1
Performance Materials & Coatings [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0				10		0	10
Corporate Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	10				24		20	34
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	10	$ 60	$ 34	$ 57	56	$ 49
Restructuring Reserve	98	108	168	212	269	315	98	269	98	$ 364
2020 Restructuring Program [Member] | Accrued and Other Current Liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	44		112				44		44
2020 Restructuring Program [Member] | Other Noncurrent Obligations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	54		56				54		54
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	8	59	30	55	53	37
Restructuring Reserve	37	45	104	144	199	252	37	199	37	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	0
Restructuring Reserve	0	0	0	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	2	1	4	2	3	12
Restructuring Reserve	$ 61	$ 63	64	$ 68	70	$ 63	$ 61	$ 70	$ 61	$ 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