Stockholders' Equity Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions		1 Months Ended		2 Months Ended		3 Months Ended	8 Months Ended		9 Months Ended
		Sep. 30, 2017		Aug. 31, 2017		Sep. 30, 2018	Aug. 31, 2017		Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance									$ 74,932
Ending Balance						$ 66,974			66,974
Predecessor [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts Reclassified from Accumulated Other Comprehensive (Loss) Income				$ 84			$ 321
Net other comprehensive income (loss)				443			1,289
Predecessor [Member] | Pension Plan
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		$ (6,473)					(6,720)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax							(78)
Amounts Reclassified from Accumulated Other Comprehensive (Loss) Income							325
Net other comprehensive income (loss)							247
Ending Balance				(6,473)			(6,473)
Predecessor [Member] | Other Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(347)					(357)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax							0
Amounts Reclassified from Accumulated Other Comprehensive (Loss) Income							10
Net other comprehensive income (loss)							10
Ending Balance				(347)			(347)
Predecessor [Member] | Cumulative Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(1,801)					(2,843)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	[1]						1,042
Amounts Reclassified from Accumulated Other Comprehensive (Loss) Income							0
Net other comprehensive income (loss)							1,042
Ending Balance				(1,801)			(1,801)
Predecessor [Member] | Derivative Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(3)					7
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax							3
Amounts Reclassified from Accumulated Other Comprehensive (Loss) Income							(13)
Net other comprehensive income (loss)							(10)
Ending Balance				(3)			(3)
Predecessor [Member] | Unrealized gain (loss) on investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		2					2
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax							1
Amounts Reclassified from Accumulated Other Comprehensive (Loss) Income							(1)
Net other comprehensive income (loss)							0
Ending Balance				2			2
Predecessor [Member] | Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(8,622)					(9,911)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax							968
Amounts Reclassified from Accumulated Other Comprehensive (Loss) Income							321
Net other comprehensive income (loss)							1,289
Ending Balance				(8,622)			(8,622)
Successor [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts Reclassified from Accumulated Other Comprehensive (Loss) Income		0				(1)			(8)
Net other comprehensive income (loss)		(572)				(75)			(1,039)
Successor [Member] | Pension Plan
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		0	[2]						128
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax		0							14
Amounts Reclassified from Accumulated Other Comprehensive (Loss) Income									(3)
Net other comprehensive income (loss)		0							11
Ending Balance		0		0	[2]	139	0	[2]	139
Successor [Member] | Other Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		0	[2]						(53)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax		0							0
Amounts Reclassified from Accumulated Other Comprehensive (Loss) Income									0
Net other comprehensive income (loss)		0							0
Ending Balance		0		0	[2]	(53)	0	[2]	(53)
Successor [Member] | Cumulative Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		0							(454)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	[1]	(572)							(1,042)
Amounts Reclassified from Accumulated Other Comprehensive (Loss) Income									0
Net other comprehensive income (loss)		(572)							(1,042)
Ending Balance		(572)		0		(1,496)	0		(1,496)
Successor [Member] | Derivative Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		0							(2)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax		0							(3)
Amounts Reclassified from Accumulated Other Comprehensive (Loss) Income									(5)
Net other comprehensive income (loss)		0							(8)
Ending Balance		0		0		(10)	0		(10)
Successor [Member] | Unrealized gain (loss) on investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		0							0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax		0							0
Amounts Reclassified from Accumulated Other Comprehensive (Loss) Income		0							0
Net other comprehensive income (loss)		0							0
Ending Balance		0		0		0	0		0
Successor [Member] | Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		0							(381)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax		(572)							(1,031)
Amounts Reclassified from Accumulated Other Comprehensive (Loss) Income									(8)
Net other comprehensive income (loss)		(572)							(1,039)
Ending Balance		$ (572)		$ 0		$ (1,420)	$ 0		$ (1,420)

[1] The cumulative translation adjustment gain for the period January 1 through August 31, 2017 is primarily driven by the weakening of the USD against the European Euro ("EUR"). The currency translation loss for the period September 1 through September 30, 2017 is primarily driven by the modest strengthening of the USD against the EUR. The currency transaction loss for the nine months ended September 30, 2018 was primarily driven by the strengthening of the USD against the EUR and the Brazilian real ("BRL").

[2] In connection with the Merger, previously unrecognized prior service benefits and net losses related to DuPont's pension and other post employment benefit ("OPEB") plans were eliminated as a result of reflecting the balance sheet at fair value as of the date of the Merger. See Note 3 and 16 for further information regarding the Merger and pension and OPEB plans, respectively.