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Business Combinations (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended
--- | --- | ---
Aug. 31, 2017 | Sep. 30, 2017
Business Acquisition [Line Items] |  |  |
Business Combination, Consideration Transferred |  | $ 74,680 |
Business Combination, Consideration Transferred, Equity Interests Issued And Issuable, Converted But Not Yet Earned |  | 144 |
$4.50 Series preferred stock [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Preferred Stock, Par or Stated Value Per Share |  |  | $ 4.50
$3.50 Series preferred stock [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Preferred Stock, Par or Stated Value Per Share |  |  | $ 3.50
Merger with Dow [Domain] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Inventory, Finished Products |  | 5,115 |
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Inventory, Semi-finished products |  | 3,066 |
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed Inventory, Raw Materials |  | 705 |
Business Combination, Fair Value Step-Up Of Acquired Inventory Including Discontinued Operations |  |  | $ 429
Business Combination, Fair Value Step-Up Of Acquired Inventory, Continuing Operations |  |  | 360
Disposal Group, Including Discontinued Operations, Fair Value Step-Up Of Acquired Inventory |  |  | $ 69
Property, plant and equipment - net |  | 12,122 |
Goodwill | [1] | 45,501 |
Adjustment to establish valuation allowance |  | 172 |
Adjustment to reflect change in reinvestment strategy |  | $ 546 |
E I DuPont de Nemours & Co [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Common Stock, Par or Stated Value Per Share |  | $ 0.30 |
DowDuPont [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Common Stock, Par or Stated Value Per Share |  | $ 0.01 |
Land and Land Improvements [Member] | Merger with Dow [Domain] |  |  |
Business Acquisition [Line Items] |  |  |
Property, plant and equipment - net |  | $ 967 |
Building [Member] | Merger with Dow [Domain] |  |  |
Business Acquisition [Line Items] |  |  |
Property, plant and equipment - net |  | 2,615 |
Machinery and Equipment [Member] | Merger with Dow [Domain] |  |  |
Business Acquisition [Line Items] |  |  |
Property, plant and equipment - net |  | 7,540 |
Construction in Progress [Member] | Merger with Dow [Domain] |  |  |
Business Acquisition [Line Items] |  |  |
Property, plant and equipment - net |  | 1,000 |
Equity and Incentive Plan [Member] | Merger with Dow [Domain] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued And Issuable, Converted But Not Yet Earned |  | $ 144 |
Equity and Incentive Plan [Member] | Common Stock [Member] | Merger with Dow [Domain] |  |  |
Business Acquisition [Line Items] |  |  |
DuPont to DowDuPont share exchange ratio |  | 1.2820 |
[1] | See Note 11 for additional information.

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