Restructuring and Related Activities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net	$ 13	$ 77	$ 15	$ 79
2020 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net	13
2020 Restructuring Program [Member] | Accrued Liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	7		7
2020 Restructuring Program [Member] | Other Noncurrent Liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	2		2
2020 Restructuring Program [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net	9
2020 Restructuring Program [Member] | Asset write-downs and write-offs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net	$ 4
DowDuPont Cost Synergy Program [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net		$ 2	$ 2	$ 4