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