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Business Combinations Fair Value of Consideration Exchanged (Details) - Merger with Dow [Member] $ / shares in Units, $ in Millions | Aug. 31, 2017 USD ($) $ / shares shares
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Business Acquisition [Line Items] |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable | $ | $ 485 | [1]
Business Combination, Consideration Transferred | $ | $ 74,680 |
Common Stock [Member] |  |
Business Acquisition [Line Items] |  |
Share exchange ratio, DuPont to DowDuPont | shares | 1.2820 |
Common Stock [Member] | DuPont [Member] |  |
Business Acquisition [Line Items] |  |
Common Stock, Shares, Outstanding | shares | 868,300,000 |
Common Stock [Member] | DowDuPont [Member] |  |
Business Acquisition [Line Items] |  |
Stock Issued During Period, Shares, New Issues | shares | 1,113,200,000 |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable | $ | $ 74,195 | [2]
Common Stock [Member] | Dow [Member] |  |
Business Acquisition [Line Items] |  |
Share Price | $ / shares | $ 66.65 |
[1] | Represents the fair value of replacement awards issued for DuPont's equity awards outstanding immediately before the Merger and attributable to the service periods prior to the Merger. The previous DuPont equity awards were converted into the right to receive 1.2820 shares of DowDuPont Common Stock.
[2] | Amount was determined based on the price per share of Dow Common Stock of $66.65 on August 31, 2017.

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