SUPPLEMENTARY INFORMATION (Sundry Income, Net) (Details) - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	Dec. 31, 2022	Mar. 31, 2021	Sep. 30, 2019	Jun. 30, 2017	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Supplementary Information [Line Items]
Non-operating pension and other postretirement benefit plan net credit					$ (264)	$ 358	$ 332
Foreign exchange losses 2					(340)	(117)	(8)
Gain (loss) related to litigation settlement					(71)	381	54
Gain on disposal					0	0	16
Gain (Loss) on Disposition of Other Assets					80	78	105
Loss on early extinguishment of debt					5	(8)	(574)
Charges related to separation, distribution and tax matters agreements					(26)	(4)	(30)
Sundry income (expense) - net					$ (280)	$ 727	$ (35)
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
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment		$ (19)			$ 642
Foreign exchange losses 2					(177)
Other - net					125	$ 31	$ 10
Corporate Segment [Member]
Supplementary Information [Line Items]
Gain (loss) related to litigation settlement					0	60	0
Gain on disposal							0
Loss on early extinguishment of debt						(8)	(574)
Charges related to separation, distribution and tax matters agreements					(26)	(4)	(30)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment					642
Foreign exchange losses 2					(109)
Dow V. Nova Chemicals Corporation Ethylene Asset Matter [Member] [Member]
Supplementary Information [Line Items]
Gain (loss) related to litigation settlement			$ 186		122			$ 570
Dow V. Nova Chemicals Corporation Patent Infringement Matter
Supplementary Information [Line Items]
Gain (loss) related to litigation settlement	$ 341			$ 160
Nonoperating Income (Expense)
Supplementary Information [Line Items]
Charges related to separation, distribution and tax matters agreements					(26)	(4)	(30)
Restructuring Costs					(18)	0	0
Foreign exchange losses 2					109
Nonoperating Income (Expense) | Breast Implant and Other Products Liability Claims
Supplementary Information [Line Items]
Loss Contingency Accrual, Period Increase (Decrease)					0	60	0
Nonoperating Income (Expense) | Dow V. Nova Chemicals Corporation Ethylene Asset Matter [Member] [Member]
Supplementary Information [Line Items]
Gain (loss) related to litigation settlement					106
Nonoperating Income (Expense) | Luxi Chemical Group Breach of Contract Matter
Supplementary Information [Line Items]
Gain (loss) related to litigation settlement					0	0	54
Nonoperating Income (Expense) | Dow V. Nova Chemicals Corporation Patent Infringement Matter
Supplementary Information [Line Items]
Gain (loss) related to litigation settlement						321	0
The Dow Chemical Company
Supplementary Information [Line Items]
Sundry income (expense) - net					$ (327)	$ 714	$ (79)