FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS (Summary of Nonrecurring Measured Fair Values) (Details) - USD ($) $ in Millions	3 Months Ended		19 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions	$ 232	$ 165
DowDuPont Cost Synergy Program [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions	224	163	$ 1,462
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	100	$ 48	613
Restructuring Charges [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, Settlement and Impairment Provisions	100
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	$ 80		$ 80