FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS (Summary of Nonrecurring Measured Fair Values) (Details) - USD ($) $ in Millions	3 Months Ended							9 Months Ended		25 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring and asset related charges - net	$ 147				$ 48			$ 368	$ 175
DowDuPont Cost Synergy Program [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring and asset related charges - net	56	$ 59	$ 144	$ 22	47	$ 30	$ 85			$ 842
DowDuPont Cost Synergy Program [Member] | Performance Materials & Coatings [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring and asset related charges - net	1	22		7
DowDuPont Cost Synergy Program [Member] | Corporate Segment [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring and asset related charges - net	50	37	143	9	43	30	71
DowDuPont Cost Synergy Program [Member] | Packaging & Specialty Plastics [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring and asset related charges - net			1	6	4		3
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 and asset related charges - net	5	29	76	13	4	13	3			230
Asset write-downs and write-offs [Member] | DowDuPont Cost Synergy Program [Member] | Performance Materials & Coatings [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring and asset related charges - net	1	22		7
Asset write-downs and write-offs [Member] | DowDuPont Cost Synergy Program [Member] | Corporate Segment [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring and asset related charges - net	4	$ 7	76	0	0	$ 13	3
Asset write-downs and write-offs [Member] | DowDuPont Cost Synergy Program [Member] | Packaging & Specialty Plastics [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring and asset related charges - net			$ 0	$ 6	4		$ 0
Fair Value, Nonrecurring [Member] | 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 and asset related charges - net								110
Fair Value, Nonrecurring [Member] | Asset write-downs and write-offs [Member] | DowDuPont Cost Synergy Program [Member] | Performance Materials & Coatings [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring and asset related charges - net								23
Fair Value, Nonrecurring [Member] | Asset write-downs and write-offs [Member] | DowDuPont Cost Synergy Program [Member] | Corporate Segment [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring and asset related charges - net								87
Leased, Non-manufacturing Facilities [Member] | Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	114							114		114
Manufacturing Facility [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges	16							34
Manufacturing Facility [Member] | Performance Materials & Coatings [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges	9
Manufacturing Facility [Member] | Packaging & Specialty Plastics [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges	7				$ 3				$ 9
Manufacturing Facility [Member] | Fair Value, Nonrecurring [Member] | Packaging & Specialty Plastics [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges								25
Non-manufacturing Assets [Member] | Fair Value, Nonrecurring [Member] | Performance Materials & Coatings [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges	9
Non-manufacturing Assets [Member] | Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Performance Materials & Coatings [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	5							$ 5		$ 5
Manufacturing Assets [Member] | Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges	75
Manufacturing Assets [Member] | Fair Value, Nonrecurring [Member] | Corporate Segment [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges	51
Manufacturing Assets [Member] | Fair Value, Nonrecurring [Member] | Packaging & Specialty Plastics [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges	$ 24