Business Combinations Merger with Dow Narrative (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
	Aug. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Aug. 30, 2017
Business Acquisition [Line Items]
Common Stock, Par or Stated Value Per Share		$ 0.30		$ 0.30
Merger with Dow [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	$ 74,680
Other intangible assets, measurement period adjustment		$ (80)
Property, plant and equipment, measurement period adjustments		(98)
Investment in nonconsolidated affiliates, measurement period adjustments		(28)
Assets held for sale, measurement period adjustments		(16)
Noncontrolling interest, measurement period adjustments		56
Goodwill, measurement period adjustments		$ 282
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
Common Stock [Member] | Merger with Dow [Member]
Business Acquisition [Line Items]
Share exchange ratio, DuPont to DowDuPont	1.2820
Successor [Member]
Business Acquisition [Line Items]
Integration and Separation Costs		$ 255
Successor [Member] | Merger with Dow [Member]
Business Acquisition [Line Items]
Goodwill, measurement period adjustments		$ 282
Predecessor [Member]
Business Acquisition [Line Items]
Integration and Separation Costs			$ 170