Divestitures and Other Transactions Divestitures and Other Transactions - Narrative (Details) - USD ($) $ in Millions	3 Months Ended					4 Months Ended		8 Months Ended	12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018		Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017		Aug. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Indemnification Assets									$ 202
Goodwill Impairment Charge	$ 0	$ 4,503	[1]	$ 0	$ 0	$ 0		$ 0	0	$ 4,503
Equity Method Investment, Other than Temporary Impairment		$ 41
Income (loss) from discontinued operations after income taxes						(568)		1,403	(671)	1,748
Specialty Products Disposal [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill Impairment Charge						0		0	1,102	0
Equity Method Investment, Other than Temporary Impairment									63
Income (loss) from discontinued operations after income taxes						(493)		1,054	(859)	1,602
Divested Ag Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued operations after income taxes						(77)	[2]	$ 326	80	$ (5)
DAS Divested Ag Business [Member] [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Sales of Business, Affiliate and Productive Assets						1,129
Pre-tax gain on disposal						$ 671
Other discontinued operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued operations after income taxes									89
Accounts and Notes Receivable [Member] | DuPont de Nemours [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Indemnification Assets									22
Accounts and Notes Receivable [Member] | Dow [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Indemnification Assets									44
Other Assets [Member] | DuPont de Nemours [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Indemnification Assets									57
Accrued and Other Current Liabilities [Member] | DuPont de Nemours [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Indemnified Liabilities									4
Accrued and Other Current Liabilities [Member] | Dow [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Indemnified Liabilities									115
Other Noncurrent Obligations [Member] | DuPont de Nemours [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Indemnified Liabilities									69
Other Noncurrent Obligations [Member] | Dow [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Indemnified Liabilities									$ 85

[1] Note 7 - Restructuring and Asset Related Charges - Net, Note 5 - Divestitures and Other Transactions, and Note 15 - Goodwill and Other Intangible Assets, for additional information related to integration and separation costs, restructuring and asset related charges - net, discontinued operations, and goodwill impairment charge, respectively.

[2] 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.