OPERATING SEGMENTS AND GEOGRAPHIC AREAS (Schedule of Operating Segments) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Sales to external customers		$ 12,910	$ 14,917	$ 25,280	$ 29,378
Earnings before interest, taxes, depreciation and amortization	[1]	2,377	2,224	5,440	4,620
Equity in earnings (losses) of nonconsolidated affiliates by operating segment (included in EBITDA)		272	227	440	478
Agricultural Sciences [Member]
Segment Reporting Information [Line Items]
Sales to external customers		1,747	1,907	3,611	4,026
Earnings before interest, taxes, depreciation and amortization	[1]	255	249	664	755
Equity in earnings (losses) of nonconsolidated affiliates by operating segment (included in EBITDA)		0	2	0	2
Consumer Solutions [Member]
Segment Reporting Information [Line Items]
Sales to external customers		1,096	1,195	2,219	2,332
Earnings before interest, taxes, depreciation and amortization	[1]	169	263	455	522
Equity in earnings (losses) of nonconsolidated affiliates by operating segment (included in EBITDA)		19	21	39	51
Infrastructure Solutions [Member]
Segment Reporting Information [Line Items]
Sales to external customers		1,961	2,268	3,789	4,303
Earnings before interest, taxes, depreciation and amortization	[1]	240	310	535	578
Equity in earnings (losses) of nonconsolidated affiliates by operating segment (included in EBITDA)		35	45	111	116
Performance Materials & Chemicals [Member]
Segment Reporting Information [Line Items]
Sales to external customers		3,241	3,761	6,450	7,311
Earnings before interest, taxes, depreciation and amortization	[1]	572	447	1,795	961
Equity in earnings (losses) of nonconsolidated affiliates by operating segment (included in EBITDA)		122	97	177	188
Performance Plastics [Member]
Segment Reporting Information [Line Items]
Sales to external customers		4,806	5,713	9,075	11,235
Earnings before interest, taxes, depreciation and amortization	[1]	1,503	1,017	2,488	1,983
Equity in earnings (losses) of nonconsolidated affiliates by operating segment (included in EBITDA)		101	68	124	136
Corporate [Member]
Segment Reporting Information [Line Items]
Sales to external customers		59	73	136	171
Earnings before interest, taxes, depreciation and amortization	[1]	(362)	(62)	(497)	(179)
Equity in earnings (losses) of nonconsolidated affiliates by operating segment (included in EBITDA)		$ (5)	$ (6)	$ (11)	$ (15)

[1] The Company uses EBITDA (which Dow defines as earnings (i.e., "Net Income") before interest, income taxes, depreciation and amortization) as its measure of profit/loss for segment reporting purposes. EBITDA by operating segment includes all operating items relating to the businesses; items that principally apply to the Company as a whole are assigned to Corporate. A reconciliation of EBITDA to "Income Before Income Taxes" is provided below.