Consolidated Statements of Equity - USD ($) $ in Millions	Total	The Dow Chemical Company's Stockholder's Equity [Member]	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss	Unearned ESOP Shares [Member]	Treasury Stock [Member]	Noncontrolling Interests [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity Attributable to Noncontrolling Interest										$ 1,026
Stockholders' Equity Attributable to Parent, Beginning at Dec. 31, 2013			$ 4,000	$ 3,054	$ 3,928	$ 21,407	$ (4,827)	$ (357)	$ (307)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued				53
Common Stock Issued/Sold Additional Paid in Capital					714
Stock-based compensation and allocation of ESOP shares					36
Net income available for The Dow Chemical Company common stockholders	$ 1,846					1,846
Dividends declared on common stock (per share - 2015: $0.84; 2014: $0.74)						(871)
Other					(6)	(10)				1
Other comprehensive income (loss)	98						98
Shares Allocated to ESOP participants								15
Purchases									(2,100)
Issuances - compensation plans									80
Total Equity, Ending at Jun. 30, 2014	27,735
Stockholders' Equity Attributable to Parent, Ending at Jun. 30, 2014		$ 26,753	4,000	3,107	4,672	22,372	(4,729)	(342)	(2,327)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity Attributable to Noncontrolling Interest										982
Net income available for The Dow Chemical Company common stockholders	882
Other										0
Other comprehensive income (loss)	95
Total Equity, Ending at Jun. 30, 2014	27,735
Stockholders' Equity Attributable to Parent, Ending at Jun. 30, 2014		26,753	4,000	3,107	4,672	22,372	(4,729)	(342)	(2,327)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity Attributable to Noncontrolling Interest										982
Stockholders' Equity Attributable to Noncontrolling Interest	931									931
Total Equity, Beginning at Dec. 31, 2014	23,354
Stockholders' Equity Attributable to Parent, Beginning at Dec. 31, 2014	22,423		4,000	3,107	4,846	23,045	(8,017)	(325)	(4,233)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued				0
Common Stock Issued/Sold Additional Paid in Capital					294
Stock-based compensation and allocation of ESOP shares					(301)
Net income available for The Dow Chemical Company common stockholders	2,528					2,528
Dividends declared on common stock (per share - 2015: $0.84; 2014: $0.74)						(956)
Other					0	(11)				0
Other comprehensive income (loss)	(393)						(393)
Shares Allocated to ESOP participants								41
Purchases									(500)
Issuances - compensation plans									487
Total Equity, Ending at Jun. 30, 2015	24,451
Stockholders' Equity Attributable to Parent, Ending at Jun. 30, 2015	23,612	23,612	4,000	3,107	4,839	24,606	(8,410)	(284)	(4,246)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity Attributable to Noncontrolling Interest										977
Net income available for The Dow Chemical Company common stockholders	1,135
Other										0
Other comprehensive income (loss)	430
Total Equity, Ending at Jun. 30, 2015	24,451
Stockholders' Equity Attributable to Parent, Ending at Jun. 30, 2015	23,612	$ 23,612	$ 4,000	$ 3,107	$ 4,839	$ 24,606	$ (8,410)	$ (284)	$ (4,246)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity Attributable to Noncontrolling Interest	$ 839									$ 839