Goodwill and Intangible Assets, net (Schedule of Finite-lived intangible assets) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Finite-Lived Intangible Assets [Line Items]
As of December 31, 2018				$ 793
Acquisitions	[1]			25
Exchange rate changes				(24)
As of September 30, 2019		$ 794		794
As of December 31, 2018				(595)
Amortization		(6)	$ (5)	(18)	$ (18)
Exchange rate changes				20
As of September 30, 2019		(593)		(593)
Net book value		201		201
Licensing Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
As of December 31, 2018				42
Acquisitions				0
Exchange rate changes				(1)
As of September 30, 2019		41		41
As of December 31, 2018				(33)
Amortization				(1)
Exchange rate changes				2
As of September 30, 2019		(32)		(32)
Net book value		9		9
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
As of December 31, 2018				651
Acquisitions				25
Exchange rate changes				(22)
As of September 30, 2019		654		654
As of December 31, 2018				(495)
Amortization				(12)
Exchange rate changes				18
As of September 30, 2019		(489)		(489)
Net book value		165		165
Developed Technology Rights [Member]
Finite-Lived Intangible Assets [Line Items]
As of December 31, 2018				44
Acquisitions				0
Exchange rate changes				(1)
As of September 30, 2019		43		43
As of December 31, 2018				(32)
Amortization				(3)
Exchange rate changes				0
As of September 30, 2019		(35)		(35)
Net book value		8		8
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
As of December 31, 2018				56
Acquisitions				0
Exchange rate changes				0
As of September 30, 2019		56		56
As of December 31, 2018				(35)
Amortization				(2)
Exchange rate changes				0
As of September 30, 2019		(37)		(37)
Net book value		$ 19		$ 19
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.