FAIR VALUE MEASUREMENTS (Basis of Fair Value Measurements on a Nonrecurring Basis) (Details) - USD ($) $ in Millions	3 Months Ended									12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions	$ 2,851	$ 147	$ 65	$ 156	$ 46	$ 48	$ 40	$ 87		$ 3,219	$ 221	$ 2,739
DowDuPont Cost Synergy Program [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions										292	184	399
Performance Materials & Coatings [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions										1,076	21	1,578
Goodwill, Impairment Loss	1,039								$ 1,491	(1,039)
Performance Materials & Coatings [Member] | DowDuPont Cost Synergy Program [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions										28	7	11
Corporate Segment [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions										529	143	428
Corporate Segment [Member] | DowDuPont Cost Synergy Program [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions										256	153	340
Packaging & Specialty Plastics [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions										439	46	716
Packaging & Specialty Plastics [Member] | DowDuPont Cost Synergy Program [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions										1	13	36
Industrial Intermediates & Infrastructure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions										1,175	11	17
Industrial Intermediates & Infrastructure [Member] | DowDuPont Cost Synergy Program [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions										7	11	12
Manufacturing Assets, Equity Method Investments, and Other Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges									246
Manufacturing Assets, Equity Method Investments, and Other Assets | Performance Materials & Coatings [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges									83
Manufacturing Assets, Equity Method Investments, and Other Assets | Corporate Segment [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges									100
Manufacturing Assets, Equity Method Investments, and Other Assets | Packaging & Specialty Plastics [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges									58
Manufacturing Assets, Equity Method Investments, and Other Assets | Industrial Intermediates & Infrastructure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges									5
Property, Plant and Equipment | DowDuPont Cost Synergy Program [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions												87
Property, Plant and Equipment | Restructuring Charges
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions											33
Manufacturing Facility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges										58
Manufacturing Facility | Performance Materials & Coatings [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges										9
Manufacturing Facility | Corporate Segment [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges										5
Manufacturing Facility | Packaging & Specialty Plastics [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges									622	44	34
Manufacturing Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges									159
Equity Method Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges									81
Other Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges									6
Fair Value, Measurements, Nonrecurring | Manufacturing Facility | Packaging & Specialty Plastics [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges										44
Fair Value, Measurements, Nonrecurring | Non-manufacturing Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges										14
Fair Value, Measurements, Nonrecurring | Non-manufacturing Assets [Member] | Performance Materials & Coatings [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges										9
Fair Value, Measurements, Nonrecurring | Non-manufacturing Assets [Member] | Corporate Segment [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges										5
Fair Value, Measurements, Nonrecurring | Manufacturing Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges										75
Fair Value, Measurements, Nonrecurring | Manufacturing Assets | Corporate Segment [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges										51
Fair Value, Measurements, Nonrecurring | Manufacturing Assets | Packaging & Specialty Plastics [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges										24
Fair Value, Measurements, Nonrecurring | Changes Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	(2,031)				(67)				(955)	(2,031)	(67)	(955)
Goodwill, Fair Value Disclosure	(1,039)								(1,491)	(1,039)		(1,491)
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill, Fair Value Disclosure	0								0	0		0
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3 [Member] | Leased, Non-manufacturing Facilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	152									152
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3 [Member] | Manufacturing Assets, Equity Method Investments, and Other Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	162				0				61	162	0	61
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3 [Member] | Property, Plant and Equipment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value									0			0
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3 [Member] | Manufacturing Facility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value					$ 0				$ 0		0	0
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3 [Member] | Non-manufacturing Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	$ 10									10
Sadara Chemical Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions										1,755
Sadara Chemical Company | Corporate Segment [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions										217
Sadara Chemical Company | Packaging & Specialty Plastics [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions										370
Sadara Chemical Company | Industrial Intermediates & Infrastructure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions										1,168
Asset write-downs and write-offs [Member] | DowDuPont Cost Synergy Program [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions										143	33	87
Asset write-downs and write-offs [Member] | Performance Materials & Coatings [Member] | DowDuPont Cost Synergy Program [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions										28	7	9
Asset write-downs and write-offs [Member] | Corporate Segment [Member] | DowDuPont Cost Synergy Program [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions										113	16	33
Asset write-downs and write-offs [Member] | Packaging & Specialty Plastics [Member] | DowDuPont Cost Synergy Program [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions										0	10	33
Asset write-downs and write-offs [Member] | Industrial Intermediates & Infrastructure [Member] | DowDuPont Cost Synergy Program [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions										$ 2	0	12
Asset Related Charges and Other, Miscellaneous Asset Write-Down and Write-Offs [Member] | DowDuPont Cost Synergy Program [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions											33	65
Asset Related Charges and Other, Miscellaneous Asset Write-Down and Write-Offs [Member] | Performance Materials & Coatings [Member] | DowDuPont Cost Synergy Program [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions											7	9
Asset Related Charges and Other, Miscellaneous Asset Write-Down and Write-Offs [Member] | Corporate Segment [Member] | DowDuPont Cost Synergy Program [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions											16	33
Asset Related Charges and Other, Miscellaneous Asset Write-Down and Write-Offs [Member] | Packaging & Specialty Plastics [Member] | DowDuPont Cost Synergy Program [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions											$ 10	11
Asset Related Charges and Other, Miscellaneous Asset Write-Down and Write-Offs [Member] | Industrial Intermediates & Infrastructure [Member] | DowDuPont Cost Synergy Program [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions												12
Asset Related Charges and Other, Facility Closing and Write-down of Non-manufacturing Assets [Member] | Packaging & Specialty Plastics [Member] | DowDuPont Cost Synergy Program [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions												$ 33