Summary of Sundry Income (Expense) - Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Gain (Loss) on Extinguishment of Debt	$ 0	$ (472)	$ (8)	$ (574)
Charges related to separation, distribution and tax matters agreements	7	0	3	5
Sundry income (expense) - net	69	(350)	292	(225)
Luxi Chemical Group Breach of Contract Matter [Member]
Gain (Loss) Related to Litigation Settlement		54		54
Nonoperating Income (Expense)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	89	86	267	247
Foreign Currency Transaction Gain (Loss), before Tax	(31)	(5)	(46)	(21)
Gain (Loss) on Extinguishment of Debt	0	472	8	574
Gain (Loss) on Disposition of Other Assets	10	12	53	74
Charges related to separation, distribution and tax matters agreements	(7)	0	(3)	(5)
Other Nonoperating Income (Expense)	8	(25)	29	0
Sundry income (expense) - net	69	(350)	292	(225)
Nonoperating Income (Expense) | Luxi Chemical Group Breach of Contract Matter [Member]
Gain (Loss) Related to Litigation Settlement	0	54	0	54
The Dow Chemical Company
Sundry income (expense) - net	73	(356)	287	(231)
The Dow Chemical Company | Nonoperating Income (Expense)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	89	86	267	247
Foreign Currency Transaction Gain (Loss), before Tax	(34)	(8)	(54)	(24)
Gain (Loss) on Extinguishment of Debt	0	472	8	574
Gain (Loss) on Disposition of Other Assets	10	12	53	74
Other Nonoperating Income (Expense)	8	(28)	29	(8)
Sundry income (expense) - net	73	(356)	287	(231)
The Dow Chemical Company | Nonoperating Income (Expense) | Luxi Chemical Group Breach of Contract Matter [Member]
Gain (Loss) Related to Litigation Settlement	$ 0	$ 54	$ 0	$ 54