Dow Consolidated Statements of Equity Statement - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Unearned ESOP Shares [Member]	Treasury Stock [Member]
Total equity		$ 0	$ 6,553	$ 33,742	$ (8,591)	$ (189)	$ 0
Common Stock, Shares, Issued		0
Stock Issued During Period, Value, New Issues and Treasury Stock Reissued			0
Stock Issued During Period, Value, Parent Company Stock			85
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition			223			44
Stockholders' Equity, Other			0	(14)
Net Income (Loss) Available to Common Stockholders, Basic				2,737
Dividends, Common Stock				0
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Subsidiaries and Equity Method Investees				(2,110)
Settlements and transfers related to separation from DowDuPont Inc.	$ 215			(152)	0
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				989	(1,037)
Other Comprehensive Income (Loss), Net of Tax	$ 241				241
Treasury Stock, Value, Acquired, Cost Method							0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Declared	$ 0.00
Total equity		0	6,758	33,899	(8,088)	(150)	0
Common Stock, Shares, Issued		0
Stock Issued During Period, Value, New Issues and Treasury Stock Reissued			0
Stock Issued During Period, Value, Parent Company Stock			22
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition			81			5
Stockholders' Equity, Other			0	(7)
Net Income (Loss) Available to Common Stockholders, Basic				1,333
Dividends, Common Stock				0
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Subsidiaries and Equity Method Investees				(1,053)
Settlements and transfers related to separation from DowDuPont Inc.				(37)	0
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				1,057	(1,057)
Other Comprehensive Income (Loss), Net of Tax	$ (242)				(242)
Treasury Stock, Value, Acquired, Cost Method							0
Common Stock, Dividends, Per Share, Declared	$ 0.00
Dow Inc.’s stockholders’ equity	$ 32,521
Noncontrolling interests	1,152
Total equity	33,673	0	6,861	35,192	(9,387)	(145)	0
Dow Inc.’s stockholders’ equity	32,483
Noncontrolling interests	1,138
Total equity	33,621	0	7,042	35,460	(9,885)	(134)	0
Common Stock, Shares, Issued		7
Stock Issued During Period, Value, New Issues and Treasury Stock Reissued			(1)
Stock Issued During Period, Value, Parent Company Stock			28
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition			147			35
Stockholders' Equity, Other			(30)	(7)
Net Income (Loss) Available to Common Stockholders, Basic				631
Dividends, Common Stock				(517)
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Subsidiaries and Equity Method Investees				(535)
Settlements and transfers related to separation from DowDuPont Inc.	(1,963)			(14,811)	(793)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				(111)	0
Other Comprehensive Income (Loss), Net of Tax	$ 104				104
Treasury Stock, Value, Acquired, Cost Method							(305)
Common Stock, Dividends, Per Share, Declared	$ 0.70
Total equity		0	7,153	35,403	(9,783)	(105)	0
Common Stock, Shares, Issued		7
Stock Issued During Period, Value, New Issues and Treasury Stock Reissued			(1)
Stock Issued During Period, Value, Parent Company Stock			0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition			64			6
Stockholders' Equity, Other			(30)	(5)
Net Income (Loss) Available to Common Stockholders, Basic				75
Dividends, Common Stock				(517)
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Subsidiaries and Equity Method Investees				0
Settlements and transfers related to separation from DowDuPont Inc.				(14,846)	(793)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				0	0
Other Comprehensive Income (Loss), Net of Tax	$ 2				2
Treasury Stock, Value, Acquired, Cost Method							(305)
Common Stock, Dividends, Per Share, Declared	$ 0.70
Dow Inc.’s stockholders’ equity	$ 17,911
Noncontrolling interests	589
Total equity	$ 18,500	$ 7	$ 7,186	$ 20,110	$ (8,988)	$ (99)	$ (305)