SUPPLEMENTARY INFORMATION (Sundry Income, Net) (Details) - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	Dec. 31, 2022	Dec. 31, 2020	Jun. 30, 2020	Sep. 30, 2019	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Supplementary Information [Line Items]
Non-operating pension and other postretirement benefit plan net credit					$ 358	$ 332	$ 103
Foreign exchange losses 2					(117)	(8)	(62)
Loss on early extinguishment of debt					(8)	(574)	(149)
Gain (loss) related to litigation settlement					381	54	544
Gain (Loss) on Disposition of Other Assets					78	105	48
Charges related to separation, distribution and tax matters agreements					(4)	(30)	21
Other - net					31	10	84
Sundry income (expense) - net					$ 727	$ (35)	$ 1,269
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration]					Sundry income (expense) - net	Sundry income (expense) - net	Sundry income (expense) - net
Dow V. Nova Chemicals Corporation Ethylene Asset Matter [Member] [Member]
Supplementary Information [Line Items]
Gain (loss) related to litigation settlement		$ 552	$ 18	$ 186
Dow V. Nova Chemicals Corporation Patent Infringement Matter
Supplementary Information [Line Items]
Gain (loss) related to litigation settlement	$ 341
Marine and Terminal Operations and Assets
Supplementary Information [Line Items]
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration]					Sundry income (expense) - net	Sundry income (expense) - net	Sundry income (expense) - net
Rail Infrastructure Operations and Assets [Member]
Supplementary Information [Line Items]
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration]					Sundry income (expense) - net	Sundry income (expense) - net	Sundry income (expense) - net
Nonoperating Income (Expense)
Supplementary Information [Line Items]
Charges related to separation, distribution and tax matters agreements					$ 4	$ 30	$ (21)
Nonoperating Income (Expense) | Breast Implant and Other Products Liability Claims
Supplementary Information [Line Items]
Loss Contingency Accrual, Period Increase (Decrease)					60	0	5
Nonoperating Income (Expense) | Luxi Chemical Group Breach of Contract Matter
Supplementary Information [Line Items]
Gain (loss) related to litigation settlement					0	54	0
Nonoperating Income (Expense) | Dow V. Nova Chemicals Corporation Patent Infringement Matter
Supplementary Information [Line Items]
Gain (loss) related to litigation settlement					321	0	544
The Dow Chemical Company
Supplementary Information [Line Items]
Non-operating pension and other postretirement benefit plan net credit					358	332	103
Foreign exchange losses 2					(126)	(13)	(65)
Loss on early extinguishment of debt					(8)	(574)	(149)
Gain (Loss) on Disposition of Other Assets					78	105	48
Other - net					31	3	82
Sundry income (expense) - net					$ 714	$ (79)	$ 1,274
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration]					Sundry income (expense) - net	Sundry income (expense) - net	Sundry income (expense) - net
The Dow Chemical Company | Marine and Terminal Operations and Assets
Supplementary Information [Line Items]
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration]					Sundry income (expense) - net	Sundry income (expense) - net	Sundry income (expense) - net
The Dow Chemical Company | Rail Infrastructure Operations and Assets [Member]
Supplementary Information [Line Items]
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration]					Sundry income (expense) - net	Sundry income (expense) - net	Sundry income (expense) - net
The Dow Chemical Company | Nonoperating Income (Expense)
Supplementary Information [Line Items]
Charges related to separation, distribution and tax matters agreements					$ 0	$ (2)	$ (11)
The Dow Chemical Company | Nonoperating Income (Expense) | Breast Implant and Other Products Liability Claims
Supplementary Information [Line Items]
Loss Contingency Accrual, Period Increase (Decrease)					60	0	5
The Dow Chemical Company | Nonoperating Income (Expense) | Dow V. Nova Chemicals Corporation Ethylene Asset Matter [Member] [Member]
Supplementary Information [Line Items]
Gain (loss) related to litigation settlement					321	0	544
The Dow Chemical Company | Nonoperating Income (Expense) | Luxi Chemical Group Breach of Contract Matter
Supplementary Information [Line Items]
Gain (loss) related to litigation settlement					$ 0	$ 54	$ 0