Amount for accounts payable to related parties.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Name:	us-gaap_AccountsPayableRelatedPartiesCurrentAndNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Related Party Transactions Transactions with DowDuPont (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Jun. 26, 2019	Dec. 31, 2018	Nov. 02, 2017
Related Party Transaction [Line Items]
Stock Repurchase Program, Authorized Amount							$ 1,000		$ 4,000
Payments of Distributions to Affiliates	$ 317	$ 823	$ 828	$ 830	$ 317	$ 2,481
DowDuPont [Member]
Related Party Transaction [Line Items]
Payments of Distributions to Affiliates					$ 317	2,481
Accounts Payable, Related Parties		$ 250				$ 250		$ 103