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Business Combinations Merger with Dow Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 8 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2017 | Sep. 30, 2017 | Aug. 31, 2017 | Sep. 30, 2018 | Aug. 31, 2017 | Sep. 30, 2018 | Dec. 31, 2017 | Aug. 30, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Common Stock, Par Value |  |  |  | $ 0.30 |  | $ 0.30 | $ 0.30 |
Merger with Dow [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred | $ 74,680 |  |  |  |  |  |  |
Goodwill, measurement period adjustments |  |  |  |  |  | $ 392 |  |
Property, plant and equipment, measurement period adjustments |  |  |  |  |  | (257) |  |
Other intangible assets, measurement period adjustment |  |  |  |  |  | $ (150) |  |
DuPont [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Common Stock, Par Value |  |  |  |  |  |  |  | $ 0.30
DuPont [Member] | $4.50 Series Preferred Stock [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  |  |  | 4.50 |  | $ 4.50 |  |
DuPont [Member] | $3.50 Series Preferred Stock [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  |  |  | $ 3.50 |  | $ 3.50 |  |
DowDuPont [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Common Stock, Par Value | $ 0.01 |  | $ 0.01 |  | $ 0.01 |  |  |
Common Stock [Member] | Merger with Dow [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Share exchange ratio, DuPont to DowDuPont | 1.2820 |  |  |  |  |  |  |
Successor [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Integration and Separation Costs |  | $ 71 |  | $ 344 |  | $ 926 |  |
Predecessor [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Integration and Separation Costs |  |  | $ 210 |  | $ 581 |  |  |

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