REVENUE (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Revenue from External Customer [Line Items]
Revenue, Percentage from Products and Service Transferred to Customers	99.00%	98.00%
Revenue, Remaining Performance Obligation, Amount	$ 869		$ 829
Revenues	15,264	$ 11,882
Contract with Customer, Liability, Revenue Recognized	65	40
Accounts and notes receivable - Trade	7,423		6,841
Contract assets - current	36		34
Contract assets - noncurrent	24		26
Contract liabilities - current	181		209
Contract liabilities - noncurrent	1,922		1,925
The Dow Chemical Company
Revenue from External Customer [Line Items]
Accounts and notes receivable - Trade	7,423		$ 6,841
U.S. & Canada
Revenue from External Customer [Line Items]
Revenues	5,537	4,028
EMEAI 1
Revenue from External Customer [Line Items]
Revenues	5,512	4,329
Asia Pacific
Revenue from External Customer [Line Items]
Revenues	2,753	2,365
Latin America
Revenue from External Customer [Line Items]
Revenues	$ 1,462	1,160
Maximum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	18 years
Packaging & Specialty Plastics [Member]
Revenue from External Customer [Line Items]
Revenues	$ 7,627	6,082
Packaging & Specialty Plastics [Member] | Hydrocarbons & Energy [Member]
Revenue from External Customer [Line Items]
Revenues	2,416	1,751
Packaging & Specialty Plastics [Member] | Packaging and Specialty Plastics [Member]
Revenue from External Customer [Line Items]
Revenues	5,211	4,331
Industrial Intermediates & Infrastructure [Member]
Revenue from External Customer [Line Items]
Revenues	4,524	3,607
Industrial Intermediates & Infrastructure [Member] | Industrial Solutions [Member]
Revenue from External Customer [Line Items]
Revenues	1,515	1,049
Industrial Intermediates & Infrastructure [Member] | Polyurethanes & CAV [Member]
Revenue from External Customer [Line Items]
Revenues	3,005	2,556
Industrial Intermediates & Infrastructure [Member] | Other [Member]
Revenue from External Customer [Line Items]
Revenues	4	2
Performance Materials & Coatings [Member]
Revenue from External Customer [Line Items]
Revenues	3,049	2,123
Performance Materials & Coatings [Member] | Coatings and Performance Monomers [Member]
Revenue from External Customer [Line Items]
Revenues	1,075	855
Performance Materials & Coatings [Member] | Consumer Solutions [Member]
Revenue from External Customer [Line Items]
Revenues	1,974	1,268
Corporate Segment [Member]
Revenue from External Customer [Line Items]
Revenues	$ 64	$ 70