Consolidated Statements of Equity (USD $) In Millions, unless otherwise specified	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 [Member]	Unearned ESOP Shares [Member]	Treasury Stock [Member]	Noncontrolling Interests [Member]
Stockholders' Equity Attributable to Parent, Beginning at Dec. 31, 2011			$ 4,000	$ 2,961	$ 2,663	$ 19,087	$ (5,996)	$ (434)	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued				47	248
Stock-based compensation and allocation of ESOP shares					370
Other					0					1
Net Income available for The Dow Chemical Company common stockholders	842					842
Dividends declared on common stock (per share - 2013: $1.28; 2012: $1.21; 2011: $0.90)						(1,419)
Dividend equivalents on participating securities						(15)
Other comprehensive income (loss)	(1,520)						(1,520)
Shares acquired								(11)
Shares allocated to ESOP participants								54
Purchases									0
Issuance to employees and employee plans									0
Total Equity, Ending at Dec. 31, 2012	21,867
Stockholders' Equity Attributable to Noncontrolling Interest, Ending at Dec. 31, 2012										990
Stockholders' Equity Attributable to Parent, Ending at Dec. 31, 2012		20,877	4,000	3,008	3,281	18,495	(7,516)	(391)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued				46	340
Stock-based compensation and allocation of ESOP shares					307
Other					0					4
Net Income available for The Dow Chemical Company common stockholders	4,447					4,447
Dividends declared on common stock (per share - 2013: $1.28; 2012: $1.21; 2011: $0.90)						(1,520)
Dividend equivalents on participating securities						(15)
Other comprehensive income (loss)	2,689						2,689
Shares acquired								(11)
Shares allocated to ESOP participants								45
Purchases									(307)
Issuance to employees and employee plans									0
Total Equity, Ending at Dec. 31, 2013	27,924
Stockholders' Equity Attributable to Noncontrolling Interest, Ending at Dec. 31, 2013	1,026									1,026
Stockholders' Equity Attributable to Parent, Ending at Dec. 31, 2013	26,898	26,898	4,000	3,054	3,928	21,407	(4,827)	(357)	(307)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued				53	895
Stock-based compensation and allocation of ESOP shares					30
Other					(7)					(3)
Net Income available for The Dow Chemical Company common stockholders	3,432					3,432
Dividends declared on common stock (per share - 2013: $1.28; 2012: $1.21; 2011: $0.90)						(1,777)
Dividend equivalents on participating securities						(17)
Other comprehensive income (loss)	(3,190)						(3,190)
Shares acquired								(11)
Shares allocated to ESOP participants								43
Purchases									(4,193)
Issuance to employees and employee plans									267
Total Equity, Ending at Dec. 31, 2014	23,354
Stockholders' Equity Attributable to Noncontrolling Interest, Ending at Dec. 31, 2014	931									931
Stockholders' Equity Attributable to Parent, Ending at Dec. 31, 2014	$ 22,423	$ 22,423	$ 4,000	$ 3,107	$ 4,846	$ 23,045	$ (8,017)	$ (325)	$ (4,233)