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	$ 7,042	$ 35,460	$ (9,885)	$ (134)	$ 0
Stock Issued During Period, Value, New Issues and Treasury Stock Reissued			(1)
Stock Issued During Period, Value, Parent Company Stock			28
APIC, Share-based Payment Arrangement, Increase for Cost 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)
Other Comprehensive Income (Loss), Net of Tax	$ 104				104
Treasury Stock, Value, Acquired, Cost Method							(305)
Common Stock, Dividends, Per Share, Declared	$ 0.70
Stockholders' Equity, Period Increase (Decrease) | Adjustments for New Accounting Pronouncement				(111)
Stock Issued During Period, Value, New Issues		7
Total equity		0	7,153	35,403	(9,783)	(105)	0
Stock Issued During Period, Value, New Issues and Treasury Stock Reissued			(1)
Stock Issued During Period, Value, Parent Company Stock			0
APIC, Share-based Payment Arrangement, Increase for Cost 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)
Other Comprehensive Income (Loss), Net of Tax	$ 2				2
Treasury Stock, Value, Acquired, Cost Method							(305)
Common Stock, Dividends, Per Share, Declared	$ 0.70
Stockholders' Equity, Period Increase (Decrease) | Adjustments for New Accounting Pronouncement				0
Stock Issued During Period, Value, New Issues		7
Dow Inc.’s stockholders’ equity	$ 17,911
Noncontrolling interests	589
Total equity	18,500	7	7,186	20,110	(8,988)	(99)	(305)
Dow Inc.’s stockholders’ equity	13,541
Noncontrolling interests	553
Total equity	14,094	8	7,325	17,045	(10,246)	(91)	(500)
Stock Issued During Period, Value, New Issues and Treasury Stock Reissued			(30)
Stock Issued During Period, Value, Parent Company Stock			0
APIC, Share-based Payment Arrangement, Increase for Cost Recognition			76			22
Stockholders' Equity, Other			0	(8)
Net Income (Loss) Available to Common Stockholders, Basic				14
Dividends, Common Stock				(1,034)
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Subsidiaries and Equity Method Investees				0
Settlements and transfers related to separation from DowDuPont Inc.	0			0	0
Other Comprehensive Income (Loss), Net of Tax	$ 21				21
Treasury Stock, Value, Acquired, Cost Method							(125)
Common Stock, Dividends, Per Share, Declared	$ 1.40
Stockholders' Equity, Period Increase (Decrease) | Adjustments for New Accounting Pronouncement				0
Stock Issued During Period, Value, New Issues		0
Total equity		8	7,370	16,763	(10,529)	(81)	(625)
Stock Issued During Period, Value, New Issues and Treasury Stock Reissued			(14)
Stock Issued During Period, Value, Parent Company Stock			0
APIC, Share-based Payment Arrangement, Increase for Cost Recognition			47			12
Stockholders' Equity, Other			0	(5)
Net Income (Loss) Available to Common Stockholders, Basic				(225)
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.				0	0
Other Comprehensive Income (Loss), Net of Tax	$ 304				304
Treasury Stock, Value, Acquired, Cost Method							0
Common Stock, Dividends, Per Share, Declared	$ 0.70
Stockholders' Equity, Period Increase (Decrease) | Adjustments for New Accounting Pronouncement				0
Stock Issued During Period, Value, New Issues		0
Dow Inc.’s stockholders’ equity	$ 12,537
Noncontrolling interests	560
Total equity	$ 13,097	$ 8	$ 7,431	$ 16,017	$ (10,225)	$ (69)	$ (625)