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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017		Jun. 30, 2017		Mar. 31, 2017		Dec. 31, 2017		Aug. 31, 2017		Dec. 31, 2018	Dec. 31, 2016
Predecessor [Member]
Effect of Fourth Quarter Events [Line Items]
Integration and Separation Costs			$ 210								$ 201		$ 170				$ 581			$ 386
Loss on Extinguishment of Debt																	0			0
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest																	119			443
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] | Performance Chemicals [Member]
Effect of Fourth Quarter Events [Line Items]
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest											10	[1]	(217)	[1]			(207)			(5)
Predecessor [Member] | Food Safety Diagnostic Business [Member]
Effect of Fourth Quarter Events [Line Items]
Pre-tax gain on disposal													162				162
Predecessor [Member] | Divested Ag Business [Member]
Effect of Fourth Quarter Events [Line Items]
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest			$ 29	[1]							$ 137	[1]	$ 160	[1]			$ 326	[1]		439
Predecessor [Member] | Ownership interest in DuPont (Shenzhen) Manufacturing Limited [Member]
Effect of Fourth Quarter Events [Line Items]
Gain on sale of entity																				$ 369
Successor [Member]
Effect of Fourth Quarter Events [Line Items]
Business Combination, Fair Value Step-Up Of Acquired Inventory	$ (360)				$ (134)	$ (109)	$ (682)	$ (703)	$ (1,109)						$ (1,469)				$ (1,628)
Integration and Separation Costs	71	[2]			449	344	327	255	243	[2]					314				1,375
Loss on Extinguishment of Debt					(81)										0				(81)
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest															(77)				(5)
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 (Expense)									2,262
Successor [Member] | Tax charge (benefit) related to The Act [Member]
Effect of Fourth Quarter Events [Line Items]
Income Tax Benefit (Expense)					$ (167)	46	$ (7)	(102)
Successor [Member] | Divested Ag Business [Member]
Effect of Fourth Quarter Events [Line Items]
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ (20)	[1]						$ 5	$ (57)	[1]					(77)	[1]			(5)
Successor [Member] | Merger with Dow [Member]
Effect of Fourth Quarter Events [Line Items]
Business Combination, Fair Value Step-Up Of Acquired Inventory															$ (1,434)				(1,563)
Brazil Valuation Allowance [Member] | Successor [Member]
Effect of Fourth Quarter Events [Line Items]
Income Tax Benefit (Expense)						$ (75)													$ 75

[1] Includes results of operations for the period September 1 through October 31, 2017, as the Divested Ag Business was disposed of on November 1, 2017.

[2] Integration and separation costs were $170 million, $201 million, and $210 million in the first quarter 2017, second quarter 2017, and the period July 1 - August 31, 2017, respectively. In the Predecessor periods, costs are recorded in selling, general and administrative expenses. See Note 3 for additional information.