RESTRUCTURING RESTRUCTURING (DowDuPont Cost Synergy Program) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Nov. 01, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net	$ 2,974	$ 139	$ (12)	$ (1)	$ 143	$ 0	$ 454	$ (2)	$ 3,100	$ 595	$ 559
DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost												$ 1,300
Restructuring, goodwill impairment and asset related charges - net									687
Restructuring Reserve	349								349
Charges against the reserve									(287)
Cash payments									(51)
Employee Severance [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									357
Restructuring Reserve	306								306
Charges against the reserve									0
Cash payments									(51)
Asset write-downs and write-offs [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									287
Restructuring Reserve	0								0
Charges against the reserve									(287)
Cash payments									0
Costs Associated with Exit and Disposal Activities [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									43
Restructuring Reserve	43								43
Charges against the reserve									0
Cash payments									0
Asset Related Charges and Other, Facility Closing and Write-down of Non-manufacturing Assets [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									94
Asset Related Charges and Other, Facility Closing and write-down of IPR&D [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									83
Asset Related Charges and Other, Write-off of Capital Projects and Other Non-manufacturing Assets [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									22
Asset Related Charges and Other, Facility Closing [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									21
Asset Related Charges and Other, Miscellaneous Asset Write-Down and Write-Offs [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									67
Minimum [Member] | Employee Severance [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost												525
Minimum [Member] | Asset write-downs and write-offs [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost, Asset Related												400
Minimum [Member] | Costs Associated with Exit and Disposal Activities [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost												290
Maximum [Member] | Employee Severance [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost												575
Maximum [Member] | Asset write-downs and write-offs [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost, Asset Related												440
Maximum [Member] | Costs Associated with Exit and Disposal Activities [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost												$ 310
Accrued and Other Current Liabilities [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	231								231
Other Noncurrent Liabilities [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 118								$ 118