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Proposed Merger with Dow Chemical (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 30, 2016 | Dec. 11, 2015 | Jun. 23, 2015
Proposed Merger with Dow Chemical [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, par value | $ 0.30 |  |  |  | $ 0.30 | $ 0.30 | $ 0.30 |  | $ 0.30 | $ 0.30
DuPont to DowDuPont share exchange ratio |  |  |  |  |  |  |  |  | 1.2820 |
Share of DowDuPont Common Stock |  |  |  |  |  |  |  |  | 1 |
Dow Preferred Stock to Common Stock exchange ratio |  |  |  |  |  |  |  | 24.2010 |  |
Shares of Dow Common Stock Issued |  |  |  |  |  |  |  | 96,804,000 |  |
DuPont's DowDuPont Common Stock share ownership |  |  |  |  |  |  |  | 48.00% |  |
Dow's DowDuPont Common Stock share ownership |  |  |  |  |  |  |  | 52.00% |  |
Business acquisition, percentage of voting interests acquired |  |  |  |  |  |  |  |  | 50.00% |
Time following termination of Merger Agreement for alternative transaction |  |  |  |  |  | 12 months |  |  |  |
Merger termination fee |  |  |  |  |  |  |  |  | $ 1,900 |
Merger related transaction costs | $ 164 | $ 122 | $ 76 | $ 24 | $ 10 | $ 386 | $ 10 |  |  |
DowDuPont [Member] |  |  |  |  |  |  |  |  |  |
Proposed Merger with Dow Chemical [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, par value |  |  |  |  |  |  |  |  | $ 0.01 |
Dow [Member] |  |  |  |  |  |  |  |  |  |
Proposed Merger with Dow Chemical [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, par value |  |  |  |  |  |  |  |  | $ 2.50 |
Preferred stock, par value |  |  |  |  |  |  |  | $ 1.00 |  |

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