Merger with DuPont (Notes)	9 Months Ended
Sep. 30, 2017
MERGER WITH DUPONT [Abstract]
Merger with DuPont [Text Block]	MERGER WITH DUPONT Effective August 31, 2017, Dow and DuPont completed the previously announced merger of equals transaction contemplated by the Agreement and Plan of Merger, dated as of December 11, 2015, as amended on March 31, 2017 (the "Merger Agreement"), by and among Dow, DuPont, DowDuPont, Diamond Merger Sub, Inc. and Orion Merger Sub, Inc. Pursuant to the Merger Agreement, (i) Diamond Merger Sub, Inc. was merged with and into Dow, with Dow surviving the merger as a subsidiary of DowDuPont (the "Diamond Merger") and (ii) Orion Merger Sub, Inc. was merged with and into DuPont, with DuPont surviving the merger as a subsidiary of DowDuPont (the "Orion Merger" and, together with the Diamond Merger, the "Mergers"). Following the consummation of the Mergers, each of Dow and DuPont became subsidiaries of DowDuPont (collectively, the "Merger"). Following the Merger, Dow and DuPont intend to pursue, subject to the receipt of regulatory approvals and approval by the board of directors of DowDuPont ("DowDuPont Board"), the separation of the combined company's agriculture business, specialty products business and materials science business through one or more tax-efficient transactions ("Intended Business Separations"). On August 31, 2017, following the Diamond Merger, Dow requested that the New York Stock Exchange ("NYSE") withdraw the shares of Dow Common Stock from listing on the NYSE and file a Form 25 with the U.S. Securities and Exchange Commission ("SEC") to report that the shares of Dow Common Stock are no longer listed on the NYSE. The shares of Dow Common Stock were suspended from trading on the NYSE prior to the open of trading on September 1, 2017. On September 12, 2017, DowDuPont announced that the DowDuPont Board and management, with the assistance of independent advisors, completed their comprehensive review of the portfolio composition of the three intended independent companies. The DowDuPont Board unanimously concluded that, in light of knowledge gained since the announcement of the proposed merger of equals, certain targeted adjustments will be made between the materials science and specialty products businesses, which will enhance the competitive advantages of the intended resulting companies. As a result of this change, it is expected that a portion of UCC's business will move to the specialty products business as part of the intended spin-off transactions, and the Corporation does not expect the intended spin-off transactions to have a material impact on the Consolidated Financial Statements.

MERGER WITH DUPONT

Effective August 31, 2017, Dow and DuPont completed the previously announced merger of equals transaction contemplated by the Agreement and Plan of Merger, dated as of December 11, 2015, as amended on March 31, 2017 (the "Merger Agreement"), by and among Dow, DuPont, DowDuPont, Diamond Merger Sub, Inc. and Orion Merger Sub, Inc. Pursuant to the Merger Agreement, (i) Diamond Merger Sub, Inc. was merged with and into Dow, with Dow surviving the merger as a subsidiary of DowDuPont (the "Diamond Merger") and (ii) Orion Merger Sub, Inc. was merged with and into DuPont, with DuPont surviving the merger as a subsidiary of DowDuPont (the "Orion Merger" and, together with the Diamond Merger, the "Mergers"). Following the consummation of the Mergers, each of Dow and DuPont became subsidiaries of DowDuPont (collectively, the "Merger"). Following the Merger, Dow and DuPont intend to pursue, subject to the receipt of regulatory approvals and approval by the board of directors of DowDuPont ("DowDuPont Board"), the separation of the combined company's agriculture business, specialty products business and materials science business through one or more tax-efficient transactions ("Intended Business Separations").

On August 31, 2017, following the Diamond Merger, Dow requested that the New York Stock Exchange ("NYSE") withdraw the shares of Dow Common Stock from listing on the NYSE and file a Form 25 with the U.S. Securities and Exchange Commission ("SEC") to report that the shares of Dow Common Stock are no longer listed on the NYSE. The shares of Dow Common Stock were suspended from trading on the NYSE prior to the open of trading on September 1, 2017.

On September 12, 2017, DowDuPont announced that the DowDuPont Board and management, with the assistance of independent advisors, completed their comprehensive review of the portfolio composition of the three intended independent companies. The DowDuPont Board unanimously concluded that, in light of knowledge gained since the announcement of the proposed merger of equals, certain targeted adjustments will be made between the materials science and specialty products businesses, which will enhance the competitive advantages of the intended resulting companies. As a result of this change, it is expected that a portion of UCC's business will move to the specialty products business as part of the intended spin-off transactions, and the Corporation does not expect the intended spin-off transactions to have a material impact on the Consolidated Financial Statements.