Amount for accounts payable to related parties.

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Name:	us-gaap_AccountsPayableRelatedPartiesCurrentAndNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Related Parties Transactions with DowDuPont (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Nov. 02, 2017
Related Party Transaction [Line Items]
Stock Repurchase Program, Authorized Amount				$ 4,000
Distributions to DowDuPont	$ 317	$ 831
DowDuPont [Member]
Related Party Transaction [Line Items]
Distributions to DowDuPont	317	$ 830
Accounts Payable, DowDuPont	$ 103		$ 103