SUPPLEMENTARY INFORMATION (Details) - USD ($) $ in Millions				3 Months Ended					9 Months Ended
		Jun. 01, 2016	May 05, 2015	Sep. 30, 2016		Mar. 31, 2016	Sep. 30, 2015		Sep. 30, 2016		Sep. 30, 2015		Dec. 31, 2015
Sundry income (expense) - net				$ (4)			$ 632		$ 1,305		$ 1,680
Gain on Univation step acquisition									2,445		361
Other current assets				625					625				$ 647
Litigation Settlement, Amount									(835)		0
AgroFresh [Member]
Gain on divestiture of ANGUS Chemical Company (1)	[1]						621
Performance Materials & Chemicals [Member] | ANGUS Chemical Company [Member]
Gain on divestiture of ANGUS Chemical Company (1)	[1]			0			0		0		670
Performance Materials & Chemicals [Member] | Urethane Antitrust Litigation and opt-out cases [Domain]
Settlement of the urethane matters class action lawsuit and opt-out cases (2)	[2]			0			0		(1,235)		0
Performance Materials & Chemicals [Member] | Chlorine Value Chain [Domain]
Settlement of the urethane matters class action lawsuit and opt-out cases (2)	[2]			(33)			0		(33)		0
Agricultural Sciences [Member] | AgroFresh [Member]
Gain on divestiture of ANGUS Chemical Company (1)				0	[1]		624		0	[1]	621	[1]
Dow Corning Corporation [Member]
Gain on Univation step acquisition		$ 2,445
Dow Corning Corporation [Member] | Consumer Solutions and Infrastructure Solutions [Member] [Domain]
Gain on ownership restructure of Dow Corning (1)	[1]			0			0		2,445		0
Univation Technologies, LLC [Member] | Performance Plastics [Member]
Gain on Univation step acquisition			$ 361	$ 0	[1]		$ 0	[1]	0	[1]	$ 361	[1]
Urethane Antitrust Litigation [Domain] | Performance Materials & Chemicals [Member]
Settlement of the urethane matters class action lawsuit and opt-out cases (2)						$ (835)
Litigation Settlement, Amount									$ 835

[1] See Note 4 for additional information.

[2] See Note 11 for additional information.