Quaterly Financial Data Quarterly Financial Data (Parentheticals) (Details) - USD ($) $ in Millions	1 Months Ended	2 Months Ended	3 Months Ended							4 Months Ended	8 Months Ended	12 Months Ended
	Sep. 30, 2017	Aug. 31, 2017	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Aug. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Predecessor [Member]
Effect of Fourth Quarter Events [Line Items]
Transaction Costs				$ (201)	$ (170)	$ (164)	$ (122)	$ (76)	$ (24)		$ 581	$ 386	$ 10
Predecessor [Member] | Continuing Operations [Member]
Effect of Fourth Quarter Events [Line Items]
Tax benefit related to reduction in company's unrecognized tax benefits					53						53
Pre tax benefit on associated accrued interest reversals					$ 47
Predecessor [Member] | Food Safety Diagnostic Business [Member]
Effect of Fourth Quarter Events [Line Items]
Pre-tax gain on disposal											$ 162
Predecessor [Member] | Ownership interest in DuPont (Shenzhen) Manufacturing Limited [Member]
Effect of Fourth Quarter Events [Line Items]
Gain on sale of entity												$ 369
Predecessor [Member] | Merger with Dow [Member]
Effect of Fourth Quarter Events [Line Items]
Transaction Costs		$ (210)
Successor [Member]
Effect of Fourth Quarter Events [Line Items]
Business Combination, Fair Value Step-Up Of Acquired Inventory	$ (360)		$ (1,109)							$ (1,469)
Transaction Costs	$ (71)		$ (243)							314
Successor [Member] | Tax benefit due to Tax Cuts and Jobs Act and an internal entity restructuring [Member]
Effect of Fourth Quarter Events [Line Items]
Income Tax Benefit										2,262
Successor [Member] | Merger with Dow [Member]
Effect of Fourth Quarter Events [Line Items]
Business Combination, Fair Value Step-Up Of Acquired Inventory										$ (1,434)