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			106
APIC, Share-based Payment Arrangement, Increase for Cost Recognition			294			50
Stockholders' Equity, Other			0	(13)
Net Income (Loss) Available to Common Stockholders, Basic				3,750
Dividends, Common Stock				0
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Subsidiaries and Equity Method Investees				(3,158)
Settlements and transfers related to separation from DowDuPont Inc.	$ 276			(204)	0
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				989	(1,037)
Other Comprehensive Income (Loss), Net of Tax	$ 482				482
Treasury Stock, Value, Acquired, Cost Method							0
ESOP shares acquired						0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Declared	$ 0
Total equity		0	6,861	35,192	(9,387)	(145)	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			21
APIC, Share-based Payment Arrangement, Increase for Cost Recognition			71			6
Stockholders' Equity, Other			0	1
Net Income (Loss) Available to Common Stockholders, Basic				1,013
Dividends, Common Stock				0
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Subsidiaries and Equity Method Investees				(1,048)
Settlements and transfers related to separation from DowDuPont Inc.				(52)	0
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				0	0
Other Comprehensive Income (Loss), Net of Tax	$ 241				241
Treasury Stock, Value, Acquired, Cost Method							0
ESOP shares acquired						0
Common Stock, Dividends, Per Share, Declared	$ 0
Dow Inc.’s stockholders’ equity	$ 32,774
Noncontrolling interests	1,181
Total equity	33,955	0	6,953	35,106	(9,146)	(139)	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			4
Stock Issued During Period, Value, Parent Company Stock			28
APIC, Share-based Payment Arrangement, Increase for Cost Recognition			202			41
Stockholders' Equity, Other			(37)	(11)
Net Income (Loss) Available to Common Stockholders, Basic				964
Dividends, Common Stock				(1,033)
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Subsidiaries and Equity Method Investees				(535)
Settlements and transfers related to separation from DowDuPont Inc.	(1,935)			(14,861)	(793)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				(111)	0
Other Comprehensive Income (Loss), Net of Tax	$ (127)				(127)
Treasury Stock, Value, Acquired, Cost Method							(406)
ESOP shares acquired						(2)
Common Stock, Dividends, Per Share, Declared	$ 1.40
Total equity		7	7,186	20,110	(8,988)	(99)	(305)
Common Stock, Shares, Issued		0
Stock Issued During Period, Value, New Issues and Treasury Stock Reissued			5
Stock Issued During Period, Value, Parent Company Stock			0
APIC, Share-based Payment Arrangement, Increase for Cost Recognition			55			6
Stockholders' Equity, Other			(7)	(4)
Net Income (Loss) Available to Common Stockholders, Basic				333
Dividends, Common Stock				(516)
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Subsidiaries and Equity Method Investees				0
Settlements and transfers related to separation from DowDuPont Inc.				(50)	0
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				0	0
Other Comprehensive Income (Loss), Net of Tax	$ (231)				(231)
Treasury Stock, Value, Acquired, Cost Method							(101)
ESOP shares acquired						(2)
Common Stock, Dividends, Per Share, Declared	$ 0.70
Dow Inc.’s stockholders’ equity	$ 17,399
Noncontrolling interests	587
Total equity	$ 17,986	$ 7	$ 7,239	$ 19,873	$ (9,219)	$ (95)	$ (406)