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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 | 4 Months Ended | 8 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2017 | Sep. 30, 2017 | Aug. 31, 2017 | Dec. 31, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Aug. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Aug. 30, 2017
Merger with Dow [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  | $ 74,680 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Awards converted but not yet earned |  | 144 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Inventory, Finished Goods |  | 4,929 |  | $ 4,929 |  |  |  |  |  |  |  |  | $ 4,929 |  |  |
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Inventory, Semi-finished goods |  | 3,055 |  | 3,055 |  |  |  |  |  |  |  |  | 3,055 |  |  |
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Raw Materials and stores and supplies |  | 823 |  | 823 |  |  |  |  |  |  |  |  | 823 |  |  |
Property, plant and equipment |  | 11,941 |  | 11,941 |  |  |  |  |  |  |  |  | 11,941 |  |  |
Goodwill | [1] | 45,105 |  | $ 45,105 |  |  |  |  |  |  |  |  | $ 45,105 |  |  |
Deferred Taxes, Business Combination, Adjustment To Derecognize Valuation Allowance |  | 172 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Taxes, Business Combination, Adjustment For Reinvestment Strategy |  | $ 546 |  |  |  |  |  |  |  |  |  |  |  |  |  |
DuPont [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.30
DuPont [Member] | $4.50 Series Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.50
DuPont [Member] | $3.50 Series Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.50
DowDuPont [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share |  | $ 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Machinery and Equipment [Member] | Merger with Dow [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  | $ 7,466 |  | $ 7,466 |  |  |  |  |  |  |  |  | $ 7,466 |  |  |
Building [Member] | Merger with Dow [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  | 2,583 |  | 2,583 |  |  |  |  |  |  |  |  | 2,583 |  |  |
Construction in Progress [Member] | Merger with Dow [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  | 980 |  | 980 |  |  |  |  |  |  |  |  | 980 |  |  |
Land and Land Improvements [Member] | Merger with Dow [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  | 912 |  | 912 |  |  |  |  |  |  |  |  | 912 |  |  |
Successor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share |  |  |  |  | $ 0.30 |  |  |  |  |  |  | $ 0.30 |  |  |  |
Business Combination, Fair Value Step-Up Of Acquired Inventory, Amount recognized in Cost of Goods sold |  |  | $ 360 |  | $ 1,109 |  |  |  |  |  |  | $ 1,469 |  |  |  |
Goodwill |  | 45,105 |  | 45,105 | 45,589 |  |  |  |  |  |  | 45,589 | 45,105 |  |  |
Integration and Separation Costs |  |  | $ (71) |  | $ (243) |  |  |  |  |  |  | 314 |  |  |  |
Successor [Member] | Merger with Dow [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Fair Value Step-Up Of Acquired Inventory Recognized Including Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  | 1,538 |  |  |  |
Business Combination, Fair Value Step-Up Of Acquired Inventory, Amount recognized in Cost of Goods sold |  |  |  |  |  |  |  |  |  |  |  | 1,434 |  |  |  |
Disposal Group, Including Discontinued Operations, Fair Value Step-Up Of Acquired Inventory Recognized |  |  |  |  |  |  |  |  |  |  |  | $ 104 |  |  |  |
Predecessor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share |  |  |  |  |  |  |  | $ 0.30 |  |  |  |  |  | $ 0.30 |  |
Goodwill |  | $ 4,543 |  | 4,543 |  |  |  | $ 4,169 |  |  |  |  | 4,543 | $ 4,169 | $ 4,238 |
Integration and Separation Costs |  |  |  |  |  | $ (201) | $ (170) | $ (164) | $ (122) | $ (76) | $ (24) |  | $ 581 | $ 386 | $ 10 |
Predecessor [Member] | Merger with Dow [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Integration and Separation Costs |  |  |  | $ (210) |  |  |  |  |  |  |  |  |  |  |  |
[1] | See Note 12 for additional information.

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