Stock-Based Compensation Stock Option Activity Rollforward (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		4 Months Ended	8 Months Ended
		Dec. 31, 2017	Aug. 31, 2017
Predecessor [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, beginning of period		12,830	15,696
Stock options granted during period			1,626
Options exercised during period			(4,356)
Option forfeited/expired during period			(136)
Options outstanding, end of period			12,830
Options Exercisable at End of Period			8,441
Options Outstanding at beginning of period, Weighted Average Exercise Price		$ 61.84	$ 58.11
Options Granted during period, Weighted Average Exercise Price			76.18
Options Exercised during period, Weighted Average Exercise Price			54.52
Options Forfeited/Expired during period, Weighted Average Exercise Price			60.93
Options Outstanding at end of period, Weighted Average Exercise Price			61.84
Options Exercisable at End of Period, Weighted Average Exercise Price			$ 57.78
Weighted Average Remaining Contractual Term			4 years 259 days
Options Exercisable at End of Period, Weighted Average Remaining Contractual Term			3 years 135 days
Aggregate Intrinsic Value			$ 283,365
Options Exercisable at End of Period, Aggregate Intrinsic Value			$ 220,716
Successor [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, beginning of period	[1]	16,447
Stock options granted during period		174
Options exercised during period		(702)
Option forfeited/expired during period		(30)
Options outstanding, end of period		15,889	16,447	[1]
Options Exercisable at End of Period		10,881
Options Outstanding at beginning of period, Weighted Average Exercise Price		$ 48.24
Options Granted during period, Weighted Average Exercise Price		45.29
Options Exercised during period, Weighted Average Exercise Price		43.07
Options Forfeited/Expired during period, Weighted Average Exercise Price		54.83
Options Outstanding at end of period, Weighted Average Exercise Price		48.43	$ 48.24
Options Exercisable at End of Period, Weighted Average Exercise Price		$ 45.75
Weighted Average Remaining Contractual Term		3 years 270 days
Options Exercisable at End of Period, Weighted Average Remaining Contractual Term		3 years 22 days
Aggregate Intrinsic Value		$ 362,088
Options Exercisable at End of Period, Aggregate Intrinsic Value		$ 277,163

[1] As a result of the Merger, all previous DuPont equity awards were converted into the right to receive 1.2820 shares of DowDuPont Common Stock, as discussed above. As a result, the number of shares outstanding at September 1, 2017 represents the shares as of August 31, 2017 multiplied by the conversion factor.