Summary of Sundry Income (Expense) - Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Gain (Loss) on Extinguishment of Debt	$ (8)	$ (102)	$ (8)	$ (102)
Charges related to separation, distribution and tax matters agreements	8	5	(4)	5
Sundry income (expense) - net	75	(3)	223	125
Nonoperating Income (Expense)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	89	86	178	161
Foreign Currency Transaction Gain (Loss), before Tax	(17)	(8)	(15)	(16)
Gain (Loss) on Extinguishment of Debt	8	102	8	102
Gain (Loss) on Disposition of Other Assets	12	14	43	62
Charges related to separation, distribution and tax matters agreements	(8)	(5)	(4)	(5)
Other Nonoperating Income (Expense)	7	12	21	25
Sundry income (expense) - net	75	(3)	223	125
The Dow Chemical Company
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	89	86	178	161
Foreign Currency Transaction Gain (Loss), before Tax	(22)	(4)	(20)	(16)
Gain (Loss) on Extinguishment of Debt	8	102	8	102
Gain (Loss) on Disposition of Other Assets	12	14	43	62
Other Nonoperating Income (Expense)	7	12	21	20
Sundry income (expense) - net	$ 78	$ 6	$ 214	$ 125