Business Combinations Fair Value of Assets and Liabilities (Details) - Merger with Dow [Member] - USD ($) $ in Millions		4 Months Ended
		Dec. 31, 2017	Aug. 31, 2017
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Cash and Equivalents			$ 4,005
Marketable Securities			2,849
Accounts and Notes Receivable			7,851
Inventories			8,807
Other current assets			360
Inventory Measurement Period Adjustment	[1]	$ (79)
Investment in nonconsolidated affiliates			1,654
Investment in nonconsolidated affiliates measurement period adjustments	[1]	(31)
Assets held for sale - current			3,748
Assets held for sale - current measurement period adjustments	[1]	564
Property, plant and equipment			11,941
Property, plant and equipment measurement period adjustments	[1]	(181)
Goodwill	[2]		45,105
Goodwill, Measurement Period Adjustments	[1],[2]	(396)
Other intangible assets	[2]		27,221
Other intangible assets measurement period adjustments	[1],[2]	(623)
Deferred income taxes			284
Deferred income taxes, measurement period adjustments	[1]	(203)
Other assets			2,076
Total assets			115,901
Total assets, measurement period adjustments	[1]	(949)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Short Term Borrowings and capital lease obligations			5,319
Accounts Payable			3,283
Income Taxes Payable			140
Accrued and other current liabilities			3,517
Liabilities Held For Sale Current			115
Liabilities Held For Sale Current measurement period adjustments	[1]	11
Long-term Debt			9,878
Deferred Tax Liabilities			8,468
Deferred Tax Liabilities measurement period adjustments	[1]	(940)
Pension And Other Postretirement Benefits Noncurrent			8,056
Pension And Other Postretirement Benefits Noncurrent measurement period adjustments	[1]	(36)
Other Noncurrent Obligations			2,028
Total Liabilities			40,804
Total liabilities measurement period adjustments	[1]	(965)
Noncontrolling interest			178
Noncontrolling interest measurement period adjustments	[1]	$ 16
Preferred Stock			239
Fair value of net assets			74,680
Scenario, Previously Reported [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Cash and Equivalents	[3]		4,005
Marketable Securities	[3]		2,849
Accounts and Notes Receivable	[3]		7,851
Inventories	[3]		8,886
Other current assets	[3]		360
Investment in nonconsolidated affiliates	[3]		1,685
Assets held for sale - current	[3]		3,184
Property, plant and equipment	[3]		12,122
Goodwill	[2],[3]		45,501
Other intangible assets	[2],[3]		27,844
Deferred income taxes	[3]		487
Other assets	[3]		2,076
Total assets	[3]		116,850
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Short Term Borrowings and capital lease obligations	[3]		5,319
Accounts Payable	[3]		3,283
Income Taxes Payable	[3]		140
Accrued and other current liabilities	[3]		3,517
Liabilities Held For Sale Current	[3]		104
Long-term Debt	[3]		9,878
Deferred Tax Liabilities	[3]		9,408
Pension And Other Postretirement Benefits Noncurrent	[3]		8,092
Other Noncurrent Obligations	[3]		2,028
Total Liabilities	[3]		41,769
Noncontrolling interest	[3]		162
Preferred Stock	[3]		239
Fair value of net assets	[3]		$ 74,680

[1] DuPont recorded measurement period adjustments in the fourth quarter of 2017 to reflect facts and circumstances in existence as of the Merger Effectiveness Time. These measurement period adjustments primarily related to changes in preliminary valuation assumptions, including market participant estimates of cash flows and estimates of asset useful lives, as well as other initial estimates. All measurement period adjustments were offset against goodwill.

[2] See Note 12 for additional information.

[3] As previously reported in the company’s Quarterly Report on Form 10-Q for the period ended September 30, 2017.