PLANNED MERGER WITH DUPONT (Details) $ in Millions	Jun. 30, 2017 USD ($) mo
Business Acquisition [Line Items]
Planned Merger with DuPont, Maximum one-year loss of revenues to Dow for DuPont's proposed transaction with FMC \| $	$ 350
Planned Merger with DuPont, expected number of months for completion of intended spins \| mo	18

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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