FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS (Summary of Nonrecurring Measured Fair Values) (Details) - USD ($) $ in Millions	3 Months Ended						6 Months Ended		22 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring and asset related charges - net	$ 65				$ 40		$ 221	$ 127
DowDuPont Cost Synergy Program [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring and asset related charges - net	59	$ 144	$ 22	$ 47	30	$ 85			$ 786
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	29	76	13	4	13	3			225
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, Measurements, 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							105
Leased, Non-manufacturing Facilities [Member] | Fair Value, Measurements, 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	104						104		$ 104
Manufacturing Facility [Member] | Packaging & Specialty Plastics [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges	$ 6				$ 3			$ 6
Manufacturing Facility [Member] | Fair Value, Measurements, Nonrecurring [Member] | Packaging & Specialty Plastics [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges							$ 18