Pension Plans and Other Post Employment Benefit Plans Summary of Fair Value Measurement of Level 3 Pension Plan Assets (Details) - Pension Plan - USD ($) $ in Millions		4 Months Ended	8 Months Ended		12 Months Ended
		Dec. 31, 2017	Aug. 31, 2017		Dec. 31, 2016	Dec. 31, 2015
Predecessor [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			$ 19,685		$ 16,656	$ 17,497
Predecessor [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			181		198	238
Actual Return (Loss) on Plan Assets Sold			(19)		(28)
Actual Return (Loss) on Plan Assets Still Held			15		19
Purchases, Sales, and Settlements			0		(37)
Assets Transferred into (out of) Level 3			(13)		6
Predecessor [Member] | Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets					2,475
Predecessor [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			46		39	34
Actual Return (Loss) on Plan Assets Sold			(20)		(25)
Actual Return (Loss) on Plan Assets Still Held			22		27
Purchases, Sales, and Settlements			(1)		(3)
Assets Transferred into (out of) Level 3			6		6
Predecessor [Member] | Asset-backed Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets					721
Predecessor [Member] | Asset-backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			2		0	1
Actual Return (Loss) on Plan Assets Sold			0		0
Actual Return (Loss) on Plan Assets Still Held			0		0
Purchases, Sales, and Settlements			0		(1)
Assets Transferred into (out of) Level 3			2		0
Predecessor [Member] | Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets					1
Predecessor [Member] | Hedge Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			0		0	0
Actual Return (Loss) on Plan Assets Sold			0		0
Actual Return (Loss) on Plan Assets Still Held			0		0
Purchases, Sales, and Settlements			0		0
Assets Transferred into (out of) Level 3			0		0
Predecessor [Member] | Private Market Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets					67
Predecessor [Member] | Private Market Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			17		42	37
Actual Return (Loss) on Plan Assets Sold			0		0
Actual Return (Loss) on Plan Assets Still Held			(5)		2
Purchases, Sales, and Settlements			1		3
Assets Transferred into (out of) Level 3			(21)		0
Predecessor [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets					275
Predecessor [Member] | Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			98		98	144
Actual Return (Loss) on Plan Assets Sold			0		0
Actual Return (Loss) on Plan Assets Still Held			7		(10)
Purchases, Sales, and Settlements			(7)		(36)
Assets Transferred into (out of) Level 3			0		0
Successor [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		$ 20,284	20,395	[1]
Successor [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		161	181
Actual Return (Loss) on Plan Assets Sold		(3)
Actual Return (Loss) on Plan Assets Still Held		6
Purchases, Sales, and Settlements		(23)
Successor [Member] | Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		3,181
Successor [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		27	46
Actual Return (Loss) on Plan Assets Sold		(3)
Actual Return (Loss) on Plan Assets Still Held		5
Purchases, Sales, and Settlements		(21)
Successor [Member] | Asset-backed Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		706
Successor [Member] | Asset-backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		2	2
Actual Return (Loss) on Plan Assets Sold		0
Actual Return (Loss) on Plan Assets Still Held		0
Purchases, Sales, and Settlements		0
Successor [Member] | Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		85
Successor [Member] | Hedge Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		2	0
Actual Return (Loss) on Plan Assets Sold		0
Actual Return (Loss) on Plan Assets Still Held		0
Purchases, Sales, and Settlements		2
Successor [Member] | Private Market Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		14
Successor [Member] | Private Market Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		14	17
Actual Return (Loss) on Plan Assets Sold		0
Actual Return (Loss) on Plan Assets Still Held		(3)
Purchases, Sales, and Settlements		0
Successor [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		342
Successor [Member] | Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		96	98
Actual Return (Loss) on Plan Assets Sold		0
Actual Return (Loss) on Plan Assets Still Held		4
Purchases, Sales, and Settlements		(6)
UNITED STATES | Predecessor [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[2]				4,071
UNITED STATES | Predecessor [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			16		18	20
Actual Return (Loss) on Plan Assets Sold			(1)		(3)
Actual Return (Loss) on Plan Assets Still Held			(7)		1
Purchases, Sales, and Settlements			6		0
Assets Transferred into (out of) Level 3			0		0
UNITED STATES | Successor [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[3]	4,043
UNITED STATES | Successor [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		17	16
Actual Return (Loss) on Plan Assets Sold		0
Actual Return (Loss) on Plan Assets Still Held		1
Purchases, Sales, and Settlements		0
Non-US [Member] | Predecessor [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets					3,278
Non-US [Member] | Predecessor [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			2		1	$ 2
Actual Return (Loss) on Plan Assets Sold			2		0
Actual Return (Loss) on Plan Assets Still Held			(2)		(1)
Purchases, Sales, and Settlements			1		0
Assets Transferred into (out of) Level 3			0		$ 0
Non-US [Member] | Successor [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		3,064
Non-US [Member] | Successor [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		3	$ 2
Actual Return (Loss) on Plan Assets Sold		0
Actual Return (Loss) on Plan Assets Still Held		(1)
Purchases, Sales, and Settlements		$ 2

[1] The benefit obligation and the fair value of plan assets at the beginning of the period September 1 through December 31, 2017, reflects the remeasurement of the plans at the Merger Effectiveness Time.

[2] The DuPont pension plans directly held $732 million (4 percent of total plan assets) of DuPont common stock at December 31, 2016.

[3] The DuPont pension plans directly held $910 million (4 percent of total plan assets) of DowDuPont common stock at December 31, 2017.