FAIR VALUE MEASUREMENTS (Basis of Fair Value Measurements on a Nonrecurring Basis) (Details) - USD ($) $ in Millions	3 Months Ended					12 Months Ended
	Dec. 31, 2020	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions						$ 6	$ 708	$ 3,219
Asset Impairment Charges							49
DowDuPont Cost Synergy Program [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring Reserve, Accrual Adjustment								292
2020 Restructuring Program [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions	$ 573		$ 575
Restructuring Reserve, Accrual Adjustment						12
Performance Materials & Coatings [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions						10	192	1,076
Goodwill, Impairment Loss				$ 1,039
Performance Materials & Coatings [Member] | 2020 Restructuring Program [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions	177
Restructuring Reserve, Accrual Adjustment						10
Corporate Segment [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions						(13)	464	529
Corporate Segment [Member] | 2020 Restructuring Program [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions	363
Restructuring Reserve, Accrual Adjustment						(7)
Packaging & Specialty Plastics [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions						8	30	439
Packaging & Specialty Plastics [Member] | 2020 Restructuring Program [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions	11
Restructuring Reserve, Accrual Adjustment						8
Industrial Intermediates & Infrastructure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions						1	22	1,175
Industrial Intermediates & Infrastructure [Member] | 2020 Restructuring Program [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions	22
Restructuring Reserve, Accrual Adjustment						1
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								44
Fair Value, Measurements, Nonrecurring | Changes Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill, Fair Value Disclosure				(1,039)				(1,039)
Fair Value, Measurements, Nonrecurring | Changes Measurement [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	(245)	$ (245)					(245)
Fair Value, Measurements, Nonrecurring | Changes Measurement [Member] | Leased assets, non-manufacturing assets and equity method investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value				(2,031)				(2,031)
Fair Value, Measurements, Nonrecurring | Performance Materials & Coatings [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges							15
Fair Value, Measurements, Nonrecurring | Corporate Segment [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges							15
Fair Value, Measurements, Nonrecurring | Packaging & Specialty Plastics [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges							19
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							19	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							30	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							15	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							15	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 | 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
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	110	110		152			110	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	121	121					121
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	11	11		10			11	10
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3 [Member] | Leased assets, non-manufacturing assets and equity method investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value				162				162
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 Reserve, Accrual Adjustment								143
Asset write-downs and write-offs [Member] | 2020 Restructuring Program [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions	196		$ 197				196
Restructuring Reserve, Accrual Adjustment		$ (1)				12
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 Reserve, Accrual Adjustment								28
Asset write-downs and write-offs [Member] | Performance Materials & Coatings [Member] | 2020 Restructuring Program [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions	116						116
Restructuring Reserve, Accrual Adjustment						8
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 Reserve, Accrual Adjustment								113
Asset write-downs and write-offs [Member] | Corporate Segment [Member] | 2020 Restructuring Program [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions	47						47
Restructuring Reserve, Accrual Adjustment						3
Asset write-downs and write-offs [Member] | Packaging & Specialty Plastics [Member] | 2020 Restructuring Program [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions	11						11
Restructuring Reserve, Accrual Adjustment						0
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 Reserve, Accrual Adjustment								$ 2
Asset write-downs and write-offs [Member] | Industrial Intermediates & Infrastructure [Member] | 2020 Restructuring Program [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring, Settlement and Impairment Provisions	$ 22						$ 22
Restructuring Reserve, Accrual Adjustment						$ 1