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Summary of Significant Accounting Standards and Policies - Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Carrying value of goodwill
Balance at the beginning of the period	$ 803	$ 784
Acquisitions		5
Currency translation	(12)	14
Balance at the end of the period	791	803
North America
Carrying value of goodwill
Balance at the beginning of the period	600	610
Acquisitions		(10)
Balance at the end of the period	600	600
South America
Carrying value of goodwill
Balance at the beginning of the period	26	26
Currency translation	(4)
Balance at the end of the period	22	26
Asia Pacific
Carrying value of goodwill
Balance at the beginning of the period	107	85
Acquisitions		15
Currency translation	(3)	7
Balance at the end of the period	104	107
EMEA
Carrying value of goodwill
Balance at the beginning of the period	70	63
Currency translation	(5)	7
Balance at the end of the period	$ 65	$ 70

X

- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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- Definition

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.

+ References

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- Definition

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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- Definition

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