NONCONSOLIDATED AFFILIATES AND RELATED COMPANY TRANSACTIONS, Schedule of the Company's Direct or Indirect Ownership Interest in Principal Nonconsolidated Affiliates (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]
Investment in nonconsolidated affiliates	$ 4,201		$ 4,501		$ 4,121
Equity in earnings of nonconsolidated affiliates	835		1,034		536
Dow Corning Corporation [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	50.00%		50.00%		50.00%
EQUATE Petrochemical Company K.S.C. [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	42.50%	[1]	42.50%	[1]	42.50%	[1]
The Kuwait Olefins Company K.S.C. [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	42.50%	[1]	42.50%	[1]	42.50%	[1]
The Kuwait Styrene Company KSC [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	42.50%	[1],[2]
Map Ta Phut Olefins Company [Domain]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	32.77%	[3]	32.77%	[3]	32.77%	[3]
MEGlobal [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	50.00%	[1]	50.00%	[1]	50.00%	[1]
Sadara [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	35.00%		35.00%		35.00%
Siam Polyethylene Company Limited [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	50.00%		50.00%		50.00%
Siam Polystyrene Company Limited [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	50.00%		50.00%		50.00%
Siam Styrene Monomer Co, Ltd [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	50.00%		50.00%		50.00%
Siam Synthetic Latex Company Limited [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	50.00%		50.00%		50.00%
Univation Technologies, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	50.00%	[4]	50.00%	[4]	50.00%	[4]
Nonconsolidated Affiliates [Member]
Schedule of Equity Method Investments [Line Items]
Number of Nonconsolidated Affiliates	59		63
Principal Nonconsolidated Affiliates [Member]
Schedule of Equity Method Investments [Line Items]
Investment in nonconsolidated affiliates	3,487		3,625
Equity in earnings of nonconsolidated affiliates	$ 845		$ 951		$ 479
Direct Ownership Interest [Domain] | Map Ta Phut Olefins Company [Domain]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	20.27%
Indirect Ownership Interest [Domain] [Domain] | Map Ta Phut Olefins Company [Domain]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	12.50%

[1] In the fourth quarter of 2014, the Company announced it will reconfigure and reduce its equity base in EQUATE Petrochemical Company K.S.C., The Kuwait Olefins Company K.S.C., The Kuwait Styrene Company K.S.C. and MEGlobal through a divestment of a portion of the Company’s interests. Dow expects such transaction(s) to be completed by mid-2016.

[2] The Kuwait Styrene Company K.S.C. was added as a principal nonconsolidated affiliate in the fourth quarter of 2014.

[3] The Company's effective ownership of Map Ta Phut Olefins Company Limited is 32.77 percent, of which the Company directly owns 20.27 percent and indirectly owns 12.5 percent through its equity interest in Siam Polyethylene Company Limited and Siam Synthetic Latex Company Limited.

[4] On October 2, 2014, the Company reached a definitive agreement with ExxonMobil Chemical Company to acquire the remaining 50 percent ownership interest in Univation Technologies, LLC ("Univation"), which will result in Univation becoming a wholly owned subsidiary of Dow. The transaction is expected to close in the first half of 2015, pending regulatory approvals.