Goodwill and Intangible Assets - Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Beginning balance	$ 595	$ 535
Acquisitions	2	2
Divestitures	0	0
Translation	(28)	58
Ending balance	569	595
Americas
Goodwill [Roll Forward]
Beginning balance	91	91
Acquisitions	0	0
Divestitures	0	0
Translation	0	0
Ending balance	91	91
Europe, Middle East and Africa
Goodwill [Roll Forward]
Beginning balance	437	383
Acquisitions	2	1
Divestitures	0	0
Translation	(24)	53
Ending balance	415	437
Asia Pacific
Goodwill [Roll Forward]
Beginning balance	67	61
Acquisitions	0	1
Divestitures	0	0
Translation	(4)	5
Ending balance	$ 63	$ 67

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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