Goodwill and Intangible Assets, net (Schedule of Finite-lived intangible assets) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Finite-Lived Intangible Assets [Line Items]
As of December 31, 2018				$ 793
Acquisitions	[1]			25
Exchange rate changes				(2)
As of June 30, 2019		$ 816		816
As of December 31, 2018				(595)
Amortization		(6)	$ (7)	(12)	$ (13)
Exchange rate changes				2
As of June 30, 2019		(605)		(605)
Net book value		211		211
Licensing Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
As of December 31, 2018				42
Acquisitions				0
Exchange rate changes				0
As of June 30, 2019		42		42
As of December 31, 2018				(33)
Amortization				(1)
Exchange rate changes				0
As of June 30, 2019		(34)		(34)
Net book value		8		8
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
As of December 31, 2018				651
Acquisitions				25
Exchange rate changes				(2)
As of June 30, 2019		674		674
As of December 31, 2018				(495)
Amortization				(8)
Exchange rate changes				2
As of June 30, 2019		(501)		(501)
Net book value		173		173
Developed Technology Rights [Member]
Finite-Lived Intangible Assets [Line Items]
As of December 31, 2018				44
Acquisitions				0
Exchange rate changes				0
As of June 30, 2019		44		44
As of December 31, 2018				(32)
Amortization				(2)
Exchange rate changes				0
As of June 30, 2019		(34)		(34)
Net book value		10		10
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
As of December 31, 2018				56
Acquisitions				0
Exchange rate changes				0
As of June 30, 2019		56		56
As of December 31, 2018				(35)
Amortization				(1)
Exchange rate changes				0
As of June 30, 2019		(36)		(36)
Net book value		$ 20		$ 20
Omni Plastics [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life				13 years

[1] Represents intangible assets acquired related to Next Polymers Ltd. with a weighted average amortization period of 13 years.